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D1-050 Girodisc Audi R8, Lamborghini 394mm Front Replacement Rings Restore maximum braking performance on your Audi R8 or Lamborghini Huracán with Girodisc D1-050 394mm front replacement rings. These precision-machined rotors are direct replacements for Girodisc two-piece systems and bolt to your existing aluminum hats using the supplied floating hardware kit. Each ring is manufactured from Girodisc’s proprietary high-carbon cast iron for consistent friction, superior heat control, and fade-free braking under aggressive use. Vehicle Fitment Compatible with:• Audi R8 (Gen 1 & Gen 2, all trims with 394mm iron rotor setup)• Lamborghini Huracán LP580 / LP610 / EVO (non-CCB)Note: Designed exclusively for Girodisc 394mm two-piece front rotor systems. Not compatible with OEM carbon-ceramic or one-piece rotors. Features • Sold as a left/right pair with complete floating hardware kit• Direct replacements for Girodisc 394mm two-piece front rotors• CNC-machined from high-carbon cast iron for strength and thermal stability• Directional curved vanes enhance cooling efficiency and airflow• Maintains OEM brake bias, ABS, and traction control calibration• Precision-balanced for vibration-free performance• Designed exclusively for Girodisc aluminum hats Specifications • Diameter: 394 mm• Position: Front• Material: High-carbon cast iron• Mount type: Floating two-piece system• Includes: Two rotor rings and complete hardware kit• Sold/priced per pair Girodisc D1-050 Audi R8 / Lamborghini Front Replacement Ring FAQs Can these be used with OEM Audi or Lamborghini rotor hats? No. These rings are designed only for Girodisc aluminum hats and will not mount to OEM one-piece or carbon-ceramic rotor systems. Which pad compounds work best with these rotors? For street and light-track use, Ferodo DS2500 or Hawk HPS 5.0 perform exceptionally. For track use, Pagid RS29 or Carbotech XP12 are recommended for balanced heat control and bite. Do these rotors improve braking over OEM? Yes. The two-piece floating design reduces unsprung weight and increases heat dissipation, giving you more consistent pedal feel and fade resistance. What torque spec should be used on the hardware? Torque each bolt to 12 ft-lbs (16 Nm) with blue Loctite, then recheck after the first full heat cycle to confirm secure float and proper alignment. Bring supercar-level braking consistency back to your Audi R8 or Lamborghini Huracán with Girodisc D1-050 394 mm front replacement rings — engineered for precision, durability, and repeatable performance at any speed.

D2-159 Girodisc McLaren 380mm Rear Replacement Rings Refresh the braking performance of your McLaren with Girodisc D2-159 380mm rear replacement rings. These are direct-fit replacements for Girodisc two-piece rear rotors, designed to bolt to your existing aluminum hats using the included floating hardware kit. Replace only the wear surface and maintain your lightweight, high-performance Girodisc setup. Vehicle Fitment Compatible with:• McLaren MP4-12C (rear)• McLaren 570S / 570GT (rear)• McLaren 650S (rear)• McLaren 675LT (rear)• McLaren 720S (rear)Note: For vehicles equipped with Girodisc 380mm two-piece rear rotor systems. Not compatible with OEM or carbon-ceramic rotors. Features • Sold as a left/right pair and includes full hardware kit• Direct replacements for Girodisc 380mm two-piece rear rotors• CNC-machined from high-carbon cast iron for superior heat control• Curved directional vanes increase cooling efficiency• Maintains OEM brake balance and ABS calibration• Designed exclusively for Girodisc aluminum hats – not compatible with OEM or other brands Specifications • Diameter: 380mm• Position: Rear• Material: High-carbon cast iron• Mount type: Floating two-piece system• Includes: Two rings and new hardware kit• Sold/priced per pair Girodisc D2-159 Replacement Ring FAQs Will these fit OEM McLaren rotors? No. These are made specifically for Girodisc two-piece rotor hats and will not fit factory or carbon-ceramic assemblies. Are both sides included? Yes. Each D2-159 kit includes both left and right replacement rings plus a complete hardware kit. Why replace just the rings instead of the full rotor? It saves cost, retains your Girodisc hats, and restores performance without replacing the full assembly. Can I reuse the old hardware? No. Always install the new floating hardware included in the kit for proper fitment and long-term safety. Upgrade your McLaren’s braking performance with Girodisc D2-159 380mm rear replacement rings — engineered for durability, heat control, and consistent stopping power on both street and track.

Girodisc Subaru WRX STI Rear Rotors Designed for enthusiasts who demand faster response and greater stopping consistency, Girodisc rear rotors for the 2008–2017 Subaru WRX STI combine lightweight performance with race-proven cooling technology. These two-piece floating rotors deliver improved balance, heat control, and durability—ideal for both spirited street driving and track days. Vehicle Fitment Subaru WRX STI (2008–2017)Compatible with OEM Brembo rear calipers and factory parking brake system. Lightweight, High-Performance Design The Girodisc system bolts directly to factory hubs. Some OEM and aftermarket brake pads require minor modification to clear the hardware while retaining the stock parking brake. This simple adjustment involves slightly grinding the backing plate to match the pad’s arc, and full instructions are included. Pads supplied by Girodisc for this application are already CNC-modified for a direct fit. Each rotor assembly combines a 6061-T6 aluminum hat with Girodisc’s proprietary cast-iron friction ring, cast and machined in the USA. The curved internal vane structure acts as a centrifugal pump, pulling air through the rotor to maximize cooling and reduce fade. At only 11 lbs each versus 18 lbs stock, these rotors significantly reduce unsprung and rotational weight for sharper handling and quicker acceleration. Features • Direct replacement for OEM rotors – minor pad modification may be required• 6061-T6 billet aluminum hats, hard-anodized for corrosion resistance• Proprietary cast-iron friction rings cast and machined in the USA• Floating mount system with cadmium-plated steel drive pins• Anti-noise spring washers prevent rattle while maintaining float• Curved vane design enhances airflow and cooling• 11 lbs per rotor vs. 18 lbs OEM – reduces unsprung mass by 7 lbs each• Fully rebuildable – replace only the iron rings when worn• Sold/priced per pair Girodisc A2-095 Rear Rotor FAQs: Do these rotors require modification to install? The rotors themselves bolt directly on. However, some brake pads require minor backing plate modification to clear the hardware. Full instructions are provided, and Girodisc pads are pre-machined for plug-and-play use. Will these rotors retain my factory parking brake? Yes. Girodisc specifically designed this setup to keep full functionality of the OEM parking brake system. How much weight savings can I expect? Each Girodisc rotor is approximately 7 lbs lighter than stock, reducing rotational inertia and improving suspension response. Are these suitable for track days or street use? Absolutely. These rotors are engineered for both daily driving and high-performance conditions, providing better cooling and fade resistance under load. Upgrade your Subaru WRX STI with Girodisc rear rotors for lighter, cooler, and more consistent braking performance—precision-built to handle everything from mountain roads to race circuits.

Girodisc Subaru WRX STI ('04–07) Rear Rotors Upgrade your 2004–2007 Subaru WRX STI with Girodisc lightweight two-piece rear rotors engineered for precision, durability, and improved heat management. These rotors deliver faster response, reduced fade, and sharper braking feel while maintaining factory balance and ABS performance. Perfect for both daily driving and high-performance track use. Vehicle Fitment Compatible with:• Subaru WRX STI (2004–2007)• Subaru WRX STI Limited (2007)Direct OEM replacement – bolts directly to factory hubs and calipers. Note: Minor pad modification may be required for proper clearance (see below). Track-Tested, Street-Ready Braking Performance The Girodisc system replaces the OEM one-piece rotors with a two-piece floating design to reduce unsprung mass and improve heat dissipation. Each rotor hat is CNC-machined from 6061-T6 aircraft-grade aluminum and hard-anodized for strength and corrosion resistance. The proprietary cast-iron rings are made and machined in the USA, featuring curved directional vanes that draw cooling air through the disc for maximum thermal efficiency. The result is consistent, fade-free braking performance under the most demanding conditions. Features • Direct OEM replacement for 2004–2007 Subaru WRX STI rear rotors• Lightweight two-piece floating rotor assembly• CNC-machined 6061-T6 aluminum hats with anodized finish• Proprietary cast-iron friction rings with curved directional vanes• Cadmium-plated drive pins resist corrosion and fatigue• Anti-noise spring washers eliminate rattle and vibration• Retains OEM parking brake compatibility• Approximately 7 lbs lighter per rotor than stock• Fully rebuildable – replace only iron rings when worn• Sold/priced per pair Installation Note The OEM pads and some aftermarket brake pads require slight modification to fit the Girodisc hardware layout while maintaining OEM parking brake operation. This involves lightly grinding the backing plate of the pad to match the pad material arc. Girodisc includes instructions, and all pads purchased directly from Girodisc come pre-modified for a plug-and-play fit. Girodisc A2-007 Rear Rotor FAQs: Do these rotors fit directly on the 2004–2007 STI? Yes. The A2-007 rotors are designed specifically for the GD-chassis WRX STI and bolt directly to the factory hub and calipers. Why is pad modification needed? Girodisc’s floating two-piece design changes the hardware arrangement slightly, requiring a small pad clearance adjustment to ensure proper fit and full parking brake functionality. How much lighter are these than stock rotors? Approximately 7 lbs per corner—11 lbs each compared to roughly 18 lbs stock—reducing unsprung weight and improving handling response. Are these suitable for aggressive driving or track use? Absolutely. The Girodisc design offers superior heat control, reduced fade, and consistent braking during sustained high-temperature operation. Experience precise braking control and lasting performance with Girodisc rear rotors for your Subaru WRX STI—engineered for the driver who demands performance without compromise.

Girodisc Subaru WRX STI (2004–2017) Front Rotors The Girodisc system is a direct replacement for the OEM front rotors on the 2004–2017 Subaru WRX STI. Weighing only 16.6 lbs per rotor, these lightweight 2-piece assemblies dramatically reduce unsprung and rotational mass, improving steering response, acceleration, and suspension control. Designed for both high-performance street use and demanding track conditions, the Girodisc system maintains factory brake bias and ABS functionality while delivering improved cooling and endurance. Precision Engineering The rotor rings are machined from Girodisc’s proprietary high-carbon iron alloy, poured and processed entirely in-house in Bellingham, Washington. This advanced metallurgy ensures superior thermal stability and wear resistance under extreme braking conditions. The 30 curved vanes act as centrifugal pumps, drawing air through the hub to enhance rotor cooling during high-load track sessions. Features Direct bolt-on replacement for OEM front rotors – no modifications required Lightweight two-piece floating design reduces unsprung weight Proprietary high-carbon iron rings ensure consistent performance and long life 6061-T6 aluminum hat, hard anodized for durability Floating hardware with spring clips and Belleville washers for quiet operation Curved vane internal design maximizes air flow and cooling Fully rebuildable – replace iron rings while reusing the hats and hardware Manufactured entirely in the USA using domestically sourced materials Vehicle Fitment Subaru WRX STI (2004–2017) Technical Specifications Part Number: A1-007 Position: Front Diameter: 326mm Thickness: 30mm Weight: 16.6 lbs per rotor Rotor Type: Two-piece floating Hat Material: 6061-T6 aluminum (black anodized) Disc Material: Proprietary high-carbon cast iron Vane Design: 30 curved directional vanes Drive Pins: High-strength steel alloy, cadmium-plated Sold/Price: Per pair FAQs for Girodisc A1-007 Are these a direct fit for my Subaru WRX STI? Yes. They bolt directly onto all 2004–2017 Subaru WRX STI models with factory calipers and require no additional hardware. Can I reuse the aluminum hats? Yes. The Girodisc system is fully rebuildable—only the iron rotor rings need to be replaced when worn. Will they make noise on the street? No. The included Belleville washers and spring clips eliminate the rattles commonly associated with floating rotors. Are these suitable for track days? Absolutely. Girodisc rotors are engineered for heavy braking, offering superior heat resistance, minimal fade, and consistent performance on the track. Upgrade your Subaru WRX STI with Girodisc’s precision-engineered floating front rotors—built to deliver race-proven performance, reduced weight, and uncompromising stopping power.

Girodisc Mitsubishi Evo 6–9 Rear Rotors Transform the braking response of your Mitsubishi Evolution with Girodisc lightweight two-piece rear rotors. Designed for Evo VI through Evo IX models, these precision-engineered rotors reduce unsprung weight, improve heat management, and deliver sharper pedal feel while maintaining factory brake balance and ABS function. Vehicle Fitment Compatible with:• Mitsubishi Lancer Evolution VI (1999–2001)• Mitsubishi Lancer Evolution VII (2001–2003)• Mitsubishi Lancer Evolution VIII (2003–2005)• Mitsubishi Lancer Evolution IX (2006–2007)Direct OEM replacement – bolts to factory hubs and calipers with no major modifications required. Note: Minor pad modification may be required for proper clearance (see below). Race-Proven Design with Everyday Reliability The Girodisc system replaces the OEM one-piece rotors with a fully floating two-piece design that improves cooling efficiency and reduces rotational mass. Each rotor hat is CNC-machined from U.S.-sourced 6061-T6 aircraft-grade aluminum and hard-anodized for strength and corrosion protection. The proprietary cast-iron rings are poured and machined in-house at Girodisc’s U.S. facility, using a curved vane design to draw air through the disc for superior heat dissipation under high-performance conditions. Features • Direct-fit upgrade for Mitsubishi Evo 6, 7, 8, and 9 rear brakes• Lightweight two-piece floating construction• CNC-machined 6061-T6 aluminum hats with hard-anodized finish• Proprietary cast-iron friction rings poured and machined in the USA• Curved vane design promotes airflow and reduces fade• Cadmium-plated drive pins resist corrosion and fatigue• Anti-noise spring washers allow controlled thermal expansion• Retains OEM parking brake functionality• Reduced unsprung and rotational weight (approx. 2.5 lbs lighter per rotor)• Sold/priced per pair Installation Note The OEM pads and some aftermarket brake pads require minor modification before installation to accommodate the Girodisc hardware and retain the factory parking brake. This involves lightly grinding the pad backing plate to match the arc of the pad material. Girodisc includes full instructions, and pads purchased directly from Girodisc are pre-modified for a plug-and-play fit. Girodisc A2-008 Rear Rotor FAQs: Do these fit directly on Evo 6–9 models? Yes. The Girodisc A2-008 rotors are designed specifically for these generations of the Mitsubishi Evolution and bolt directly to the OEM hub and calipers. Why do the pads need modification? The Girodisc floating design uses additional hardware that slightly changes the clearance between the caliper and rotor. Grinding the backing plate ensures proper fit while keeping the parking brake fully functional. How do these compare to OEM rotors? Girodisc rotors weigh less, run cooler, and can be rebuilt by replacing only the iron rings—offering long-term savings and improved braking performance. Are these suitable for track use? Absolutely. The floating two-piece construction and advanced cooling design make them ideal for aggressive street driving and track events. Upgrade your Evo’s rear braking system with Girodisc rotors for reduced weight, enhanced thermal control, and race-inspired precision built to handle your most demanding driving.

Girodisc Mitsubishi Evo 6–9 Front Rotors The Girodisc system is a direct replacement for the factory rotors on Mitsubishi Evolution 6, 7, 8, and 9 models. No modifications are required—the discs bolt directly to the car and work with the OEM calipers perfectly. By upgrading to lightweight, high-performance rotors rather than a full big brake kit, your factory brake bias and ABS efficiency remain intact. The Girodisc front rotors weigh approximately 18.2 lbs each compared to the 22 lbs stock rotors, reducing rotational and unsprung weight for sharper suspension response and quicker acceleration. High-Performance Construction The hat section of each rotor is precision-machined from U.S.-sourced 6061-T6 aircraft-grade aluminum for exceptional strength and reduced weight. The rotor rings are cast from Girodisc’s proprietary high-carbon iron alloy, poured and machined entirely in-house in the USA. The curved vane internal design functions like a centrifugal pump, forcing cooling air through the rotor to maximize thermal efficiency during demanding track sessions. Girodisc A1-008 Features Direct-fit replacement—no modifications required Lightweight two-piece floating rotor design Reduces unsprung and rotational mass for faster suspension response 6061-T6 aluminum hat with proprietary high-carbon iron rotor rings Curved vane internal design improves cooling and heat dissipation Floating mount system prevents warping and pad knockback Cadmium-plated drive pins resist corrosion and extend service life Anti-noise spring washers eliminate rattles while maintaining float Fully rebuildable—replace rings as needed and reuse the hats Vehicle Fitment Mitsubishi Lancer Evolution VI (1999–2001) Mitsubishi Lancer Evolution VII (2001–2003) Mitsubishi Lancer Evolution VIII (2003–2005) Mitsubishi Lancer Evolution IX (2005–2007) Technical Specifications Part Number: A1-008 Position: Front Weight: 18.2 lbs (each) Rotor Type: Two-piece floating Hat Material: 6061-T6 aluminum (anodized) Disc Material: Girodisc proprietary high-carbon cast iron Vane Design: Curved, directional Drive Pins: 10 high-strength alloy steel, cadmium-plated Hardware: Class 12.9 cap screws with hardened washers Sold/Price: Per pair FAQs for Girodisc A1-008 Do these rotors fit directly? Yes. The Girodisc system is a bolt-on replacement for the OEM rotors—no additional modifications or adapters required. Will they work with OEM calipers and pads? Absolutely. They are designed to be fully compatible with factory brake components. Can I replace just the rings? Yes. Girodisc rotors are fully rebuildable—simply replace the iron rings when worn while reusing the aluminum hats and hardware. Are these suitable for track use? Yes. The Girodisc Evo 6–9 rotors are engineered for demanding motorsport applications, offering superior cooling and resistance to warping under heat. Upgrade your Mitsubishi Evo 6–9 with Girodisc’s precision-engineered floating rotors—built for exceptional cooling, reduced mass, and maximum braking performance on street or track.

D1-128 Girodisc Front Replacement Rotor Rings FITS: FERRARI 458 CHALLENGE REPLACEMENT ROTOR DISC ONLY, DOES NOT INCLUDE ALUMINUM HAT. Competition Motorsport is an Authorized dealer for GiroDisc products and we are one of the largest stocking dealers in the country.  We ship most products same or next business day to ensure we meet your delivery deadline. The GiroDisc replacement rotor system is a direct rotor disc replacement for the Giro Disc 2-piece hat and rotor and no modifications are necessary.   The rotor and hat mount together through a floating mount system which utilizes 8-10 high strength alloy steel drive pins manufactured by GiroDisc in the USA to our own specifications and are cadmium plated for corrosion resistance.  The alloy drive pins transfer the load from the brake action while maintaining the axial and radial float between the disc rotor and hat.  The pins are secured by grade12 cap screws with hardened washers and mounted with anti-noise spring washers to allow for heat expansion while eliminating the rattle and noise associated with floating rotors. The 2-piece GiroDisc design allows for rotor only replacement to minimize replacement costs and deliver outstanding performance and cooling. Sold/Priced per pair.

Antigravity Group-35/Q85 Lithium Car Battery Upgrade your vehicle’s starting power and drop serious weight with the Antigravity Group-35/Q85 lithium car battery. Built on safe, stable LiFePO4 chemistry with a full Battery Management System and Antigravity’s exclusive RE-START wireless jump-starting, it’s a direct Group 35/Q85 replacement that delivers huge cranking amps in a compact, ultra-light package. High power, low weight, direct-fit Group 35/Q85 replacement Key Features Direct OEM case size: Group 35/Q85 (drop-in replacement) Dimensions (L×W×H): 9 × 6.85 × 8.6 in Capacity: 40 Amp Hours Cranking power: 1500 Cranking Amps Exclusive RE-START Technology: wireless jump-starting from the included keyfob Complete Battery Management System (BMS) built in for protection and longevity LiFePO4 chemistry for enhanced thermal stability and safety Ultra lightweight: about 13.75 lbs (up to ~70% lighter than lead-acid) Threaded terminals: M8 × 1.25 Shipping note: Adult signature required SKU: 35-40-RS Why It’s Better This battery delivers significantly higher cranking performance than typical lead-acid Group 35 units while trimming major weight from the nose of the car. The integrated BMS monitors voltage, temperature, and cell balance, while RE-START gives you a built-in reserve so you can recover from an accidental drain without opening the hood or calling for a jump. Suggested Fitments (Group-35/Q85 vehicles) Acura NSX, Acura RDX, Mitsubishi EVO models, and various Subaru applications that utilize Group 35/Q85 sizing. Always confirm tray dimensions, terminal orientation/polarity, and hold-down style on your specific vehicle before purchase. What’s Inside Antigravity Group-35/Q85 lithium battery Wireless RE-START keyfob User documentation Installation Notes Verify positive/negative terminal locations match your vehicle. Ensure proper hold-down engagement and cable strain relief. After installation, start the vehicle and confirm charging voltage per the manufacturer’s guidance. Antigravity Group-35/Q85 Lithium Car Battery FAQs: Is this a direct replacement for Group 35 or Q85 batteries?Yes, it’s built in the Group 35/Q85 OEM case size for drop-in fitment in vehicles that use this size. Always confirm dimensions and terminal orientation before ordering. Do I need a special charger?Most modern smart chargers that support lithium (LiFePO4) profiles are compatible. Avoid chargers with desulfation or repair modes designed for lead-acid batteries. How does RE-START work?RE-START maintains a reserve. If the battery is drained, press the keyfob button to temporarily re-enable power so you can start the car and allow the alternator to recharge the battery. Is LiFePO4 safe for automotive use?LiFePO4 chemistry offers strong thermal stability, and the built-in BMS adds over-/under-voltage, over-current, and temperature protections when used as directed. Will it work in cold weather?LiFePO4 performance can dip at very low temperatures. For cold starts, briefly turn on electrical loads (lights, defroster) for a minute to warm the cells, then crank. Check the manufacturer’s recommended temperature ranges. What vehicles will it fit?Common Group-35/Q85 vehicles include Acura NSX/RDX, Mitsubishi EVO models, and many Subarus. Confirm tray size, terminal layout, and hold-down type for your exact trim and year. Ready to cut weight and add serious cranking performance? Drop the Antigravity Group-35/Q85 Lithium Car Battery into your build and feel the difference every time you hit the starter.   NEW! Lightweight Lithium Batteries with Wireless Remote Built-In Jump Starting! Antigravity Batteries has changed the game again with their latest Lithium-ion Car Batteries. The newest RE-START line of batteries offers built-in WIRELESS Jump-Starting! That means if your battery is ever discharged, simply press the button on the provided key fob, start the car, and drive away! No need for a jump starter or roadside assistance. You don’t even have to open the hood—activate it from inside your vehicle! If you want to track your battery status via Bluetooth, you can use the Bluetooth Battery Tracker PLUS (sold separately).

Antigravity H6/Group-48 16V Lithium Race Car Battery Never Stranded Again — The Smart 16-Volt Racing Battery The Antigravity H6/Group-48 16V Lithium Race Car Battery is the world’s first automotive battery to feature built-in wireless remote jump starting and a full intelligent Battery Management System (BMS). Purpose-built for race cars and high-performance applications, this compact and ultra-lightweight lithium battery delivers massive cranking power, ultra-fast recharging, and rock-solid reliability on the strip, track, or street. Whether you're cranking over a 1500-horsepower engine or cutting weight for quicker laps, the Antigravity 16V battery provides unmatched performance, safety, and peace of mind — all in a compact H6 form factor. Key Features & Benefits RE-START Wireless Jump-Starting: The world’s first car battery with built-in wireless jump-starting. Press the included remote key fob to wake the battery from sleep and start your car — even if it’s completely discharged. Full Battery Management System (BMS): Built-in protections for over-discharge, over-charge, short circuit, thermal overload, and automatic cell balancing — ensuring safety and maximizing battery life. Race-Ready 16-Volt Output: Delivers up to 1500 cranking amps and 30Ah capacity — outperforming 90Ah lead-acid batteries in high-discharge conditions. Ultra-Lightweight Design: Just 16.25 lbs — up to 70% lighter than comparable lead-acid batteries. Instantly drops 25–55 lbs from your vehicle for better handling, braking, and acceleration. Long Service Life: 3x the cycle life of lead/acid batteries, with 7–9 years expected lifespan depending on use and climate. Compact H6 Fitment: Designed for universal fitment in most race-specific vehicles; fits most standard battery compartments with minor modifications. Environmentally Safer: No acid, lead, cadmium, or mercury — and fully recyclable. Performance Specs Specifications Model H6-30-16 Voltage 16V Capacity 30Ah Cranking Power 1500A Weight 16.25 lbs (7.4 kg) Fitment H6 / Group 48 form factor Applications Race-specific vehicles, drag racing, circuit racing, and other high-performance builds Why Choose the Antigravity 16V H6 Battery? Built to dominate the racing world, the Antigravity 16V H6 battery gives you the fastest starts, the lightest weight, and the smartest safety system ever packed into an automotive battery. It’s the ultimate upgrade for serious racers looking to shed weight, increase performance, and never get stranded again. Pair it with an Antigravity 16V lithium charger for rapid between-round charging and optimal longevity. Summary First-ever wireless remote-activated jump-starting lithium car battery Integrated BMS with over/under voltage, short circuit, thermal, and cell-balancing protections high-discharge performance suitable for engines up to and over 1500 horsepower. Extremely lightweight and vibration-resistant design Longer service life and lower self-discharge than lead/acid batteries Environmentally safer with no lead, acid, or hazardous metals Shop with Confidence Available now from Competition Motorsport — your trusted source for high-performance motorsport batteries, expert fitment support, and fast race-season shipping.

Antigravity H5/Group-47 Lithium Car Battery Upgrade to a lightweight, high-power solution with the Antigravity H5/Group-47 Lithium Car Battery—a direct-fit drop-in replacement that boosts performance and reliability. Specifications OEM Case Size: 9.5 × 7 × 7.5 inches (fits factory trays) Amp Hours: 40 Ah High Power: 40 Ah = 1500 CA Exclusive RE-START Technology: Built-in wireless jump-starting via keyfob Battery Management System: Full BMS for cell protection and extended lifespan Ultra Lightweight: Drop up to 40 lbs instantly—70% lighter than lead-acid Threaded Terminals: M8 × 1.25 Features Direct OEM Fit: Installs without modifications, using standard hold-down and terminal locations. Wireless Jump-Start: Emergency RE-START from up to 20 ft away—no booster cables needed. Advanced BMS: Monitors and balances cells to prevent over-charge/discharge and extend battery life. Massive Weight Savings: Cuts front-end weight by 40 lbs, improving handling and weight distribution. FAQs What vehicles use Group-47 batteries? Common in many European and import models, including Audi A4, BMW 3 Series, Volkswagen Golf, and more. How much weight will I save? Up to 40 lbs compared to a typical 30 lb lead-acid battery—a 70% reduction. Can I choose different capacities? No, this battery only comes in a 40 Ah version, giving you extraordinary power reserve. Is installation plug-and-play? Absolutely—fits OEM trays and uses factory terminals and brackets. Experience lighter weight, faster starts, and built-in wireless jump-starting—order your Antigravity H5/Group-47 Lithium Car Battery today! NEW! Lightweight Lithium Batteries with Wireless Remote Built-In Jump Starting! Antigravity Batteries has changed the game again with their latest Lithium-Ion Car Batteries. The newest RE-START line of batteries offers built-in WIRELESS Jump-Starting! That means if your battery is ever discharged, simply press the button on the provided key fob, start the car, and drive away! No need for a jump starter or roadside assistance. You don’t even have to open the hood—activate it from inside your vehicle! If you want to track your battery status via Bluetooth, you can use the Bluetooth Battery Tracker PLUS (sold separately).

Antigravity Lithium Car Battery If you're ready to ditch the heavyweight boat anchor under your hood, the Antigravity H6/Group-48 Lithium Car Battery is your bolt-in, power-packed solution. This battery doesn't just start your engine—it slashes weight, boosts cranking power, and even gives you wireless jump-starting at the push of a button. It’s the ultimate OEM-sized lithium upgrade for serious drivers who demand performance without compromise. OEM Fit, Racing Power, and Smart Battery Tech Anti-Gravity Battery Features: OEM Group-48 case size: 10.75" x 7" x 7.5" — direct-fit for many modern performance vehicles Available in 40Ah (1500CA) or 60Ah (1800CA) configurations Built-in RE-START technology allows wireless jump-starting from your key fob Internal Battery Management System protects from over-discharge, over-charge, short circuits, and thermal issues Ultra-lightweight design: Up to **70% lighter** than stock—save up to **40 pounds instantly** Uses safe LiFePO4 chemistry for unmatched safety and stability Threaded M8x1.25 terminals for secure and versatile installation Antigravity H6/Group-48 Battery FAQs: Can I use this battery on my daily driver? Yes! This battery is OEM-sized and includes RE-START safety features, making it perfect for both daily and performance cars. Do I need to change any wiring to install it? No modifications needed. It's a drop-in fit for vehicles that use Group-48 (H6) batteries. How do I activate the RE-START function? Just press the button on the included wireless key fob when the battery puts itself to sleep from over-discharge. Will I need a special charger? A lithium-compatible charger is recommended for optimal performance and longevity. Stop wasting weight and risking dead batteries. Upgrade to the Antigravity H6/Group-48 and get unmatched cranking power, safety, and smart tech in one ultra-light package. Performance Vehicles That Use H6 Size Audi performance sedans and coupes BMW M Series and high-trim 3/4/5-series Cadillac ATS & CTS (all model years) Chevrolet Camaro (2010+) Chevrolet Corvette (C7 and later, 2013+) Dodge Charger & Challenger (2010+) Ferrari (requires H6-60-RS due to high parasitic draw) Lamborghini V10/V12 platforms Lotus sports cars Mercedes AMG GT models Mini Cooper S & JCW models Porsche 911, Cayman & Boxster models NEW! Lightweight Lithium Batteries with Wireless Remote Built-In Jump Starting! Antigravity Batteries has changed the game again with their latest Lithium-ion Car Batteries. The newest RE-START line of batteries offers built-in WIRELESS Jump-Starting! That means if your battery is ever discharged, simply press the button on the provided key fob, start the car, and drive away! No need for a jump starter or roadside assistance. You don’t even have to open the hood—activate it from inside your vehicle! If you want to track your battery status via Bluetooth, you can use the Bluetooth Battery Tracker PLUS (sold separately).

Antigravity Lithium Car Battery If you're tired of your heavy, sluggish OEM battery dragging down performance, the Antigravity H7/Group-94R Lithium Car Battery is your answer. This drop-in replacement delivers monster cranking power, ultra-lightweight construction, and exclusive wireless jump-starting—all packed into a direct-fit Group-94R case. Whether you're building a street beast or refining a daily driver, this battery is the weight-saving, power-packed upgrade you didn’t know you needed. Massive Power – Minimal Weight – OEM Fit Anti-Gravity Battery Features: Direct-fit H7/Group 94R case size: no modifications needed Wireless RE-START technology: jump-start at the press of a button Built-in full Battery Management System (BMS) for maximum safety Choose from 40Ah, 60Ah, or 80Ah capacities with up to ~2000 cranking amps LiFePO4 lithium iron phosphate chemistry: safer, cooler, more stable power 70% Lighter than OEM - drop up to 40 lbs! Threaded M8x1.25 terminals for secure connections Dimensions: 12.25" x 7" x 7.5" Performance Vehicles That Use H7 Size Aston Martin Audi BMW Cadillac (all ATS/CTS) Charger/Challenger (2010+) Chevy Camaro (2010+) Chevy Corvette (2013+) Lamborghini Lotus Mini Cooper Porsche Antigravity H7/Group-94R Lithium Car Battery FAQs: Does this battery fit my car if I currently have a Group-94R? Yes, it's a direct-fit replacement with OEM dimensions for seamless installation. How does the RE-START function work? If the battery is drained, press the RE-START button on the included keyfob to instantly wake the reserve power and start your car—no jumper cables needed. What's the difference between the 40Ah, 60Ah, and 80Ah versions? The capacity determines how much power is stored. 40Ah is great for most builds, while 80Ah is ideal for high-demand electronics or harsh climates. Why can’t the 80Ah version ship by air? Due to lithium shipping regulations, the larger 80Ah size must be shipped ground with adult signature required. NEW! Lightweight Lithium Batteries with Wireless Remote Built-In Jump Starting! Antigravity Batteries has changed the game again with their latest Lithium-Ion Car Batteries. The newest RE-START line of batteries offers built-in WIRELESS Jump-Starting! That means if your battery is ever discharged, simply press the button on the provided key fob, start the car, and drive away! No need for a jump starter or roadside assistance. You don’t even have to open the hood—activate it from inside your vehicle! If you want to track your battery status via Bluetooth, you can use the Bluetooth Battery Tracker PLUS (sold separately).

AP Racing J Hook 350x28mm Replacement Rear Brake Rotor Rings This kit is two replacement rotor discs and new installation hardware only. Center hats are not included. Replacement rotor rings for AP Racing 13.01.20014. Fits The Following Cars (w/ OEM iron rotors): Porsche 992 911 S/4S/GTS Porsche 991 911 S/4S/GTS Sold/priced per pair of rotor rings (including hardware). AP Racing J Hook Brake Rotors – The Gold Standard in Track Day & Racing Performance Engineered for professional motorsport, HPDE, and dedicated track day use, AP Racing’s J Hook Brake Rotors deliver uncompromising performance, thermal stability, and consistent braking power. These two-piece, floating rotors are built to handle the extreme demands of road racing, with design features derived from over 50 years of elite competition—including Formula 1, NASCAR, and IMSA. Unlike conventional one-piece rotors, AP Racing’s two-piece floating design features a billet aluminum hat mated to a cast iron disc via precision-engineered bobbins. This setup allows for controlled radial expansion under high heat, minimizing distortion and coning. The result? More even pad wear, a firmer pedal feel, and longer component life, even during extended lapping sessions or endurance racing. Floating hardware includes anti-knockback spring clips that reduce piston retraction while eliminating common NVH issues like rattling. Why Choose AP Racing J Hook Rotors? Advanced Cooling, Superior Bite, Unmatched Durability At the heart of every rotor is AP Racing’s proprietary high-carbon iron alloy, developed to withstand repeated thermal cycling without cracking or warping. Internally, directional vanes—far superior to OEM pillar or straight vane designs—maximize airflow and cooling. With 60 to 84 vanes per rotor, AP Racing achieves faster heat evacuation, reduced brake fade, and a more consistent friction surface. These rotors are left/right-specific for optimal airflow and balance. The exclusive J Hook slot pattern offers enhanced initial bite and promotes uniform heat distribution across the rotor face, reducing pad deposits and vibration. Unlike drilled rotors or straight-slot competitors, the J Hook design provides cleaner pad transfer during bed-in and superior modulation under braking—ideal for serious drivers who demand feedback and control. Yes, you might hear a little more whirr, but you’ll gain the stopping power, consistency, and longevity your lap times demand. Premium Components, Affordable Performance The rotor hats are CNC-machined from 6061-T6 billet aluminum and hard anodized for strength and heat resistance. Scalloped edges under the hat further assist heat dissipation. All hardware is U.S.-made to AP Racing spec, the same quality found on pro-level racing platforms. And while these rotors are race-proven, they’re also surprisingly cost-effective to replace. Don’t settle for cheap rotors that crack after a weekend—AP’s J Hook rings offer better durability and real long-term value. Fewer replacements mean more track time, less downtime, and peace of mind knowing you're running the best. Used by Champions. Trusted by Experts. From endurance racers to HPDE enthusiasts, AP Racing brake rotors are trusted worldwide for their reliability, longevity, and performance under pressure. Whether you're shaving seconds off your lap time or building a dedicated track car, the J Hook delivers a professional-grade solution that won’t let you down. AP Racing J Hook Brake Rotors for Auto Racing, Track Days & HPDE Why Rotor Design Matters: Heat Expansion and Floating Technology As with most metals, iron brake discs expand significantly under heat. When temperatures rise, the disc grows radially—expanding in both diameter and circumference. Traditional one-piece rotors struggle to accommodate this natural expansion. As the outer edge pulls away from the center under heat stress, it creates a condition called “coning”—a distortion that compromises pad-to-rotor contact. This distortion can lead to uneven pad wear, brake tapering, and an inconsistent, long brake pedal. AP Racing two-piece floating brake rotors are purpose-built to eliminate these issues. Engineered with “float” built into the disc or hat assembly, these rotors feature oblong-shaped mounting holes that allow the hardware to slide as the disc heats up. This flexibility ensures the disc runs true within the caliper under high-temperature loads, effectively reducing distortion, minimizing pad taper and stress cracks, and promoting longer component life. Custom Mounting Hardware & Anti-Knockback Spring Clips AP Racing rotors utilize application-specific, U.S.-made mounting hardware—not generic bolts. These premium components are the exact parts used in AP’s professional motorsport products, engineered to withstand the rigors of competitive racing. To manage lateral disc motion that can push caliper pistons backward (known as knockback), AP Racing integrates anti-knockback spring clips on alternating bobbins—five on a ten-bolt setup, six on a twelve-bolt disc. These clips keep the aluminum hat and iron disc ring properly aligned while still allowing for radial float. Bonus: they eliminate annoying rattles and vibrations, ensuring a quieter, more refined braking experience. High-Performance Hat Design for Heat Isolation The disc hats in AP Racing’s two-piece floating rotors are CNC-machined from 6061-T6 billet aluminum and finished with a hard anodized coating. This high-strength aluminum alloy was selected for its ability to maintain structural integrity even at elevated temperatures. AP adds scalloped channels beneath the hat to further encourage airflow and heat evacuation from the outer disc face, minimizing thermal transfer to hubs and wheel bearings—helping reduce maintenance costs on these expensive components. Internal Vane Engineering: Airflow Optimization & Thermal Stability AP Racing’s internal vane design sets them apart from OEM and most aftermarket competitors. While many factory brake discs use non-directional pillar vanes (low-cost and NVH-focused), AP Racing rotors use directional vanes engineered for maximum airflow. These rotors are side-specific—meaning you’ll receive a unique left and right disc in each set—ensuring optimized cooling through strategic vane orientation and shape. Beyond that, AP Racing rotors feature a superior vane count, typically ranging from 60 to 84 vanes, compared to 30–48 in most aftermarket rotors. After extensive CFD and thermal analysis, this high vane count was proven to: Increase airspeed and thermal transfer Reduce recirculation and deflection at the disc face Minimize coning, cracking, and brake fade Deliver more even pad contact and extended rotor life J Hook Slot Pattern: Exclusive to AP Racing Slots and drill holes may improve initial bite, but they also introduce “cool spots” in the rotor face—areas of uneven heating that can lead to stress risers, cracks, and pad vibration. OEM rotors often avoid this by leaving the disc face blank, but that compromises bite and brake feel. AP Racing’s patented J Hook design, developed through rigorous R&D, solves this problem. The hooks are meticulously spaced around the disc’s circumference and from hat to edge, forming a continuous distortion path that ensures even heat distribution. This encourages uniform pad deposits during bed-in, helps reduce judder and cracking, and improves consistency under repeated high-load braking. In addition, the J Hook slots provide more leading edges for pads to grip than traditional curved slots or blank rotors. While this might generate a mild whirring sound during braking, the benefits—more bite, cleaner bedding, better pedal feel—make it the top choice for committed racers and serious track day drivers. Metallurgy Backed by 50+ Years of Motorsport Leadership AP Racing's reputation is built on performance, and their proprietary iron alloy used in J Hook rotors is no exception. Drawing from over five decades of elite motorsport experience, including 750+ Formula 1 wins and widespread use across NASCAR, AP’s engineers have developed a disc alloy that excels under sustained racing temperatures and stress. Where OEM discs focus on affordability and mass production, AP Racing’s J Hook rotors are purpose-built for motorsport durability and heat resistance. Affordable Replacement Cost: Serious Value for Serious Drivers Even the best brake rotors are consumables. When you drive hard—especially at the track—your discs will eventually wear out. That’s why AP Racing designed their replacement iron rings to be cost-effective, allowing you to replace worn parts without breaking the bank. Compare that to constantly buying cheap $150 rotors every weekend—rotors that can't handle the heat and need to be swapped frequently. With AP Racing’s J Hook rotors, you get longer service intervals, less downtime, and better performance over time, making them an incredibly smart long-term investment. Proven on Track. Trusted by Champions. Top-tier racing teams rely on AP Racing J Hook rotors for one reason: they perform under pressure. Whether you're running time trials, attending HPDE events, or competing in wheel-to-wheel racing, these rotors offer professional-grade reliability, safety, and performance. Bedding and Preparation of AP Racing J Hook Discs Properly preparing your new brake discs before heavy use is extremely important. The goal of bedding-in your brake pads and discs is to mate them together properly and prepare them for heavy use.  When prepared properly, or bed-in, your pads will transfer a thin layer of material to the disc face (transfer layer).  The pads in your caliper will then actually ride on that thin layer of pad material you’ve put down on the rotor, rather than rubbing directly on the iron rotor face.  A good transfer layer is going to give you superior brake pedal feel, less noise, superior pad wear, and lower the chances of cracking your discs. Important Notes- PLEASE READ! First, make sure you are on a closed course to perform a proper bed-in.  Do NOT perform the procedure on public roads.  You need a stretch of asphalt with long straights, good visibility, and no potential obstructions.  Make sure you are in a position to safely and repeatedly attain the necessary speeds to perform the bed-in procedure.  A controlled racetrack is the best place to perform this procedure.  AP Racing and Competition Motorsport in no way suggest or condone speeding on public roads or breaking the law in your car, nor do we take responsibility for any damage or injury that occurs as a result of using our product or these procedures.  You are performing the bed-in procedure at your own risk.  During these procedures, it’s critical that you never come to a complete stop with your foot on the brake pedal.  If you have brake ducts on your car, you may want to block them off to allow your brake system to heat up easily. The procedure outlined below is a generic procedure for most types of mild race pad.  Please check your pad manufacturer’s recommended bed-in procedure. Accelerate to approximately 60mph and then decelerate down to 5 mph.  If your car has ABS, you should try to hold the brakes at a point just before ABS intervention.  Once the car slows to 5mph, immediately accelerate back up to about 60mph, and brake again to roughly 5mph.  Repeat this series of stopping and accelerating 8 to 10 times.  Again, do not come to a complete stop with your foot on the brake pedal. Cool the brake system down by cruising at 45mph+ for 5 to 10 minutes. Visually inspect your discs.  They should be a blue/grey color (instead of shiny silver), and have an even layer of pad material across and around the entire rotor face. If the AP Racing rotors don’t have a layer of pad material on them, perform another series of stops in the manner outlined above.

AP Racing J Hook 350x34mm Replacement Front Brake Rotor Rings This kit is two replacement rotor discs and new installation hardware only. Center hats are not included. Replacement rotor rings for AP Racing 13.01.20012. Fits The Following Cars (w/ OEM iron rotors): Porsche 992 911 S/4S/GTS Porsche 991 911 S/4S/GTS Sold/priced per pair of rotor rings (including hardware). AP Racing J Hook Brake Rotors – The Gold Standard in Track Day & Racing Performance Engineered for professional motorsport, HPDE, and dedicated track day use, AP Racing’s J Hook Brake Rotors deliver uncompromising performance, thermal stability, and consistent braking power. These two-piece, floating rotors are built to handle the extreme demands of road racing, with design features derived from over 50 years of elite competition—including Formula 1, NASCAR, and IMSA. Unlike conventional one-piece rotors, AP Racing’s two-piece floating design features a billet aluminum hat mated to a cast iron disc via precision-engineered bobbins. This setup allows for controlled radial expansion under high heat, minimizing distortion and coning. The result? More even pad wear, a firmer pedal feel, and longer component life, even during extended lapping sessions or endurance racing. Floating hardware includes anti-knockback spring clips that reduce piston retraction while eliminating common NVH issues like rattling. Why Choose AP Racing J Hook Rotors? Advanced Cooling, Superior Bite, Unmatched Durability At the heart of every rotor is AP Racing’s proprietary high-carbon iron alloy, developed to withstand repeated thermal cycling without cracking or warping. Internally, directional vanes—far superior to OEM pillar or straight vane designs—maximize airflow and cooling. With 60 to 84 vanes per rotor, AP Racing achieves faster heat evacuation, reduced brake fade, and a more consistent friction surface. These rotors are left/right-specific for optimal airflow and balance. The exclusive J Hook slot pattern offers enhanced initial bite and promotes uniform heat distribution across the rotor face, reducing pad deposits and vibration. Unlike drilled rotors or straight-slot competitors, the J Hook design provides cleaner pad transfer during bed-in and superior modulation under braking—ideal for serious drivers who demand feedback and control. Yes, you might hear a little more whirr, but you’ll gain the stopping power, consistency, and longevity your lap times demand. Premium Components, Affordable Performance The rotor hats are CNC-machined from 6061-T6 billet aluminum and hard anodized for strength and heat resistance. Scalloped edges under the hat further assist heat dissipation. All hardware is U.S.-made to AP Racing spec, the same quality found on pro-level racing platforms. And while these rotors are race-proven, they’re also surprisingly cost-effective to replace. Don’t settle for cheap rotors that crack after a weekend—AP’s J Hook rings offer better durability and real long-term value. Fewer replacements mean more track time, less downtime, and peace of mind knowing you're running the best. Used by Champions. Trusted by Experts. From endurance racers to HPDE enthusiasts, AP Racing brake rotors are trusted worldwide for their reliability, longevity, and performance under pressure. Whether you're shaving seconds off your lap time or building a dedicated track car, the J Hook delivers a professional-grade solution that won’t let you down. AP Racing J Hook Brake Rotors for Auto Racing, Track Days & HPDE Why Rotor Design Matters: Heat Expansion and Floating Technology As with most metals, iron brake discs expand significantly under heat. When temperatures rise, the disc grows radially—expanding in both diameter and circumference. Traditional one-piece rotors struggle to accommodate this natural expansion. As the outer edge pulls away from the center under heat stress, it creates a condition called “coning”—a distortion that compromises pad-to-rotor contact. This distortion can lead to uneven pad wear, brake tapering, and an inconsistent, long brake pedal. AP Racing two-piece floating brake rotors are purpose-built to eliminate these issues. Engineered with “float” built into the disc or hat assembly, these rotors feature oblong-shaped mounting holes that allow the hardware to slide as the disc heats up. This flexibility ensures the disc runs true within the caliper under high-temperature loads, effectively reducing distortion, minimizing pad taper and stress cracks, and promoting longer component life. Custom Mounting Hardware & Anti-Knockback Spring Clips AP Racing rotors utilize application-specific, U.S.-made mounting hardware—not generic bolts. These premium components are the exact parts used in AP’s professional motorsport products, engineered to withstand the rigors of competitive racing. To manage lateral disc motion that can push caliper pistons backward (known as knockback), AP Racing integrates anti-knockback spring clips on alternating bobbins—five on a ten-bolt setup, six on a twelve-bolt disc. These clips keep the aluminum hat and iron disc ring properly aligned while still allowing for radial float. Bonus: they eliminate annoying rattles and vibrations, ensuring a quieter, more refined braking experience. High-Performance Hat Design for Heat Isolation The disc hats in AP Racing’s two-piece floating rotors are CNC-machined from 6061-T6 billet aluminum and finished with a hard anodized coating. This high-strength aluminum alloy was selected for its ability to maintain structural integrity even at elevated temperatures. AP adds scalloped channels beneath the hat to further encourage airflow and heat evacuation from the outer disc face, minimizing thermal transfer to hubs and wheel bearings—helping reduce maintenance costs on these expensive components. Internal Vane Engineering: Airflow Optimization & Thermal Stability AP Racing’s internal vane design sets them apart from OEM and most aftermarket competitors. While many factory brake discs use non-directional pillar vanes (low-cost and NVH-focused), AP Racing rotors use directional vanes engineered for maximum airflow. These rotors are side-specific—meaning you’ll receive a unique left and right disc in each set—ensuring optimized cooling through strategic vane orientation and shape. Beyond that, AP Racing rotors feature a superior vane count, typically ranging from 60 to 84 vanes, compared to 30–48 in most aftermarket rotors. After extensive CFD and thermal analysis, this high vane count was proven to: Increase airspeed and thermal transfer Reduce recirculation and deflection at the disc face Minimize coning, cracking, and brake fade Deliver more even pad contact and extended rotor life J Hook Slot Pattern: Exclusive to AP Racing Slots and drill holes may improve initial bite, but they also introduce “cool spots” in the rotor face—areas of uneven heating that can lead to stress risers, cracks, and pad vibration. OEM rotors often avoid this by leaving the disc face blank, but that compromises bite and brake feel. AP Racing’s patented J Hook design, developed through rigorous R&D, solves this problem. The hooks are meticulously spaced around the disc’s circumference and from hat to edge, forming a continuous distortion path that ensures even heat distribution. This encourages uniform pad deposits during bed-in, helps reduce judder and cracking, and improves consistency under repeated high-load braking. In addition, the J Hook slots provide more leading edges for pads to grip than traditional curved slots or blank rotors. While this might generate a mild whirring sound during braking, the benefits—more bite, cleaner bedding, better pedal feel—make it the top choice for committed racers and serious track day drivers. Metallurgy Backed by 50+ Years of Motorsport Leadership AP Racing's reputation is built on performance, and their proprietary iron alloy used in J Hook rotors is no exception. Drawing from over five decades of elite motorsport experience, including 750+ Formula 1 wins and widespread use across NASCAR, AP’s engineers have developed a disc alloy that excels under sustained racing temperatures and stress. Where OEM discs focus on affordability and mass production, AP Racing’s J Hook rotors are purpose-built for motorsport durability and heat resistance. Affordable Replacement Cost: Serious Value for Serious Drivers Even the best brake rotors are consumables. When you drive hard—especially at the track—your discs will eventually wear out. That’s why AP Racing designed their replacement iron rings to be cost-effective, allowing you to replace worn parts without breaking the bank. Compare that to constantly buying cheap $150 rotors every weekend—rotors that can't handle the heat and need to be swapped frequently. With AP Racing’s J Hook rotors, you get longer service intervals, less downtime, and better performance over time, making them an incredibly smart long-term investment. Proven on Track. Trusted by Champions. Top-tier racing teams rely on AP Racing J Hook rotors for one reason: they perform under pressure. Whether you're running time trials, attending HPDE events, or competing in wheel-to-wheel racing, these rotors offer professional-grade reliability, safety, and performance. Bedding and Preparation of AP Racing J Hook Discs Properly preparing your new brake discs before heavy use is extremely important. The goal of bedding-in your brake pads and discs is to mate them together properly and prepare them for heavy use.  When prepared properly, or bed-in, your pads will transfer a thin layer of material to the disc face (transfer layer).  The pads in your caliper will then actually ride on that thin layer of pad material you’ve put down on the rotor, rather than rubbing directly on the iron rotor face.  A good transfer layer is going to give you superior brake pedal feel, less noise, superior pad wear, and lower the chances of cracking your discs. Important Notes- PLEASE READ! First, make sure you are on a closed course to perform a proper bed-in.  Do NOT perform the procedure on public roads.  You need a stretch of asphalt with long straights, good visibility, and no potential obstructions.  Make sure you are in a position to safely and repeatedly attain the necessary speeds to perform the bed-in procedure.  A controlled racetrack is the best place to perform this procedure.  AP Racing and Competition Motorsport in no way suggest or condone speeding on public roads or breaking the law in your car, nor do we take responsibility for any damage or injury that occurs as a result of using our product or these procedures.  You are performing the bed-in procedure at your own risk.  During these procedures, it’s critical that you never come to a complete stop with your foot on the brake pedal.  If you have brake ducts on your car, you may want to block them off to allow your brake system to heat up easily. The procedure outlined below is a generic procedure for most types of mild race pad.  Please check your pad manufacturer’s recommended bed-in procedure. Accelerate to approximately 60mph and then decelerate down to 5 mph.  If your car has ABS, you should try to hold the brakes at a point just before ABS intervention.  Once the car slows to 5mph, immediately accelerate back up to about 60mph, and brake again to roughly 5mph.  Repeat this series of stopping and accelerating 8 to 10 times.  Again, do not come to a complete stop with your foot on the brake pedal. Cool the brake system down by cruising at 45mph+ for 5 to 10 minutes. Visually inspect your discs.  They should be a blue/grey color (instead of shiny silver), and have an even layer of pad material across and around the entire rotor face. If the AP Racing rotors don’t have a layer of pad material on them, perform another series of stops in the manner outlined above.

AP Racing 350x28mm Replacement J Hook Front Floating Racing Brake Rotors Fit The Following Cars (w/ OEM Iron Rotors)- Center hat Excluded, rotor discs and hardware only. Replacement Disc Only For AP Racing 13.01.20043 Fit The Following Cars (w/ OEM Iron Rotors) Corvette C8 Z51 Rear AP Racing by Essex 2-piece Competition J Hook Rear disc pair for Corvette C8 Z51 with iron discs 350mm x 28mm (13.78" x 1.10") 72 Vane, D66 Huge increase in airflow, cooling capacity, and durability vs. OEM discs Saves 2 lbs. unsprung weight per side vs. OEM iron discs Designed for: club racing, time trial, auto-x, HPDE Works with OEM calipers, no modifications required Ultralight, fully floating, anodized billet aluminum hat with float control/anti-rattle clips Sold/priced per pair of rotor rings (including hardware). AP Racing J Hook Brake Rotors – The Gold Standard in Track Day & Racing Performance Engineered for professional motorsport, HPDE, and dedicated track day use, AP Racing’s J Hook Brake Rotors deliver uncompromising performance, thermal stability, and consistent braking power. These two-piece, floating rotors are built to handle the extreme demands of road racing, with design features derived from over 50 years of elite competition—including Formula 1, NASCAR, and IMSA. Unlike conventional one-piece rotors, AP Racing’s two-piece floating design features a billet aluminum hat mated to a cast iron disc via precision-engineered bobbins. This setup allows for controlled radial expansion under high heat, minimizing distortion and coning. The result? More even pad wear, a firmer pedal feel, and longer component life, even during extended lapping sessions or endurance racing. Floating hardware includes anti-knockback spring clips that reduce piston retraction while eliminating common NVH issues like rattling. Why Choose AP Racing J Hook Rotors? Advanced Cooling, Superior Bite, Unmatched Durability At the heart of every rotor is AP Racing’s proprietary high-carbon iron alloy, developed to withstand repeated thermal cycling without cracking or warping. Internally, directional vanes—far superior to OEM pillar or straight vane designs—maximize airflow and cooling. With 60 to 84 vanes per rotor, AP Racing achieves faster heat evacuation, reduced brake fade, and a more consistent friction surface. These rotors are left/right-specific for optimal airflow and balance. The exclusive J Hook slot pattern offers enhanced initial bite and promotes uniform heat distribution across the rotor face, reducing pad deposits and vibration. Unlike drilled rotors or straight-slot competitors, the J Hook design provides cleaner pad transfer during bed-in and superior modulation under braking—ideal for serious drivers who demand feedback and control. Yes, you might hear a little more whirr, but you’ll gain the stopping power, consistency, and longevity your lap times demand. Premium Components, Affordable Performance The rotor hats are CNC-machined from 6061-T6 billet aluminum and hard anodized for strength and heat resistance. Scalloped edges under the hat further assist heat dissipation. All hardware is U.S.-made to AP Racing spec, the same quality found on pro-level racing platforms. And while these rotors are race-proven, they’re also surprisingly cost-effective to replace. Don’t settle for cheap rotors that crack after a weekend—AP’s J Hook rings offer better durability and real long-term value. Fewer replacements mean more track time, less downtime, and peace of mind knowing you're running the best. Used by Champions. Trusted by Experts. From endurance racers to HPDE enthusiasts, AP Racing brake rotors are trusted worldwide for their reliability, longevity, and performance under pressure. Whether you're shaving seconds off your lap time or building a dedicated track car, the J Hook delivers a professional-grade solution that won’t let you down.   AP Racing J Hook Brake Rotors for Auto Racing, Track Days & HPDE Why Rotor Design Matters: Heat Expansion and Floating Technology As with most metals, iron brake discs expand significantly under heat. When temperatures rise, the disc grows radially—expanding in both diameter and circumference. Traditional one-piece rotors struggle to accommodate this natural expansion. As the outer edge pulls away from the center under heat stress, it creates a condition called “coning”—a distortion that compromises pad-to-rotor contact. This distortion can lead to uneven pad wear, brake tapering, and an inconsistent, long brake pedal. AP Racing two-piece floating brake rotors are purpose-built to eliminate these issues. Engineered with “float” built into the disc or hat assembly, these rotors feature oblong-shaped mounting holes that allow the hardware to slide as the disc heats up. This flexibility ensures the disc runs true within the caliper under high-temperature loads, effectively reducing distortion, minimizing pad taper and stress cracks, and promoting longer component life. Custom Mounting Hardware & Anti-Knockback Spring Clips AP Racing rotors utilize application-specific, U.S.-made mounting hardware—not generic bolts. These premium components are the exact parts used in AP’s professional motorsport products, engineered to withstand the rigors of competitive racing. To manage lateral disc motion that can push caliper pistons backward (known as knockback), AP Racing integrates anti-knockback spring clips on alternating bobbins—five on a ten-bolt setup, six on a twelve-bolt disc. These clips keep the aluminum hat and iron disc ring properly aligned while still allowing for radial float. Bonus: they eliminate annoying rattles and vibrations, ensuring a quieter, more refined braking experience. High-Performance Hat Design for Heat Isolation The disc hats in AP Racing’s two-piece floating rotors are CNC-machined from 6061-T6 billet aluminum and finished with a hard anodized coating. This high-strength aluminum alloy was selected for its ability to maintain structural integrity even at elevated temperatures. AP adds scalloped channels beneath the hat to further encourage airflow and heat evacuation from the outer disc face, minimizing thermal transfer to hubs and wheel bearings—helping reduce maintenance costs on these expensive components. Internal Vane Engineering: Airflow Optimization & Thermal Stability AP Racing’s internal vane design sets them apart from OEM and most aftermarket competitors. While many factory brake discs use non-directional pillar vanes (low-cost and NVH-focused), AP Racing rotors use directional vanes engineered for maximum airflow. These rotors are side-specific—meaning you’ll receive a unique left and right disc in each set—ensuring optimized cooling through strategic vane orientation and shape. Beyond that, AP Racing rotors feature a superior vane count, typically ranging from 60 to 84 vanes, compared to 30–48 in most aftermarket rotors. After extensive CFD and thermal analysis, this high vane count was proven to: Increase airspeed and thermal transfer Reduce recirculation and deflection at the disc face Minimize coning, cracking, and brake fade Deliver more even pad contact and extended rotor life J Hook Slot Pattern: Exclusive to AP Racing Slots and drill holes may improve initial bite, but they also introduce “cool spots” in the rotor face—areas of uneven heating that can lead to stress risers, cracks, and pad vibration. OEM rotors often avoid this by leaving the disc face blank, but that compromises bite and brake feel. AP Racing’s patented J Hook design, developed through rigorous R&D, solves this problem. The hooks are meticulously spaced around the disc’s circumference and from hat to edge, forming a continuous distortion path that ensures even heat distribution. This encourages uniform pad deposits during bed-in, helps reduce judder and cracking, and improves consistency under repeated high-load braking. In addition, the J Hook slots provide more leading edges for pads to grip than traditional curved slots or blank rotors. While this might generate a mild whirring sound during braking, the benefits—more bite, cleaner bedding, better pedal feel—make it the top choice for committed racers and serious track day drivers. Metallurgy Backed by 50+ Years of Motorsport Leadership AP Racing's reputation is built on performance, and their proprietary iron alloy used in J Hook rotors is no exception. Drawing from over five decades of elite motorsport experience, including 750+ Formula 1 wins and widespread use across NASCAR, AP’s engineers have developed a disc alloy that excels under sustained racing temperatures and stress. Where OEM discs focus on affordability and mass production, AP Racing’s J Hook rotors are purpose-built for motorsport durability and heat resistance. Affordable Replacement Cost: Serious Value for Serious Drivers Even the best brake rotors are consumables. When you drive hard—especially at the track—your discs will eventually wear out. That’s why AP Racing designed their replacement iron rings to be cost-effective, allowing you to replace worn parts without breaking the bank. Compare that to constantly buying cheap $150 rotors every weekend—rotors that can't handle the heat and need to be swapped frequently. With AP Racing’s J Hook rotors, you get longer service intervals, less downtime, and better performance over time, making them an incredibly smart long-term investment. Proven on Track. Trusted by Champions. Top-tier racing teams rely on AP Racing J Hook rotors for one reason: they perform under pressure. Whether you're running time trials, attending HPDE events, or competing in wheel-to-wheel racing, these rotors offer professional-grade reliability, safety, and performance. Bedding and preparation of AP Racing J Hook Disc Properly preparing your new brake discs before heavy use is extremely important. The goal of bedding-in your brake pads and discs is to mate them together properly and prepare them for heavy use.  When prepared properly, or bed-in, your pads will transfer a thin layer of material to the disc face (transfer layer).  The pads in your caliper will then actually ride on that thin layer of pad material you’ve put down on the rotor, rather than rubbing directly on the iron rotor face.  A good transfer layer is going to give you superior brake pedal feel, less noise, superior pad wear, and lower the chances of cracking your discs. Important Notes- PLEASE READ! First, make sure you are on a closed course to perform a proper bed-in.  Do NOT perform the procedure on public roads.  You need a stretch of asphalt with long straights, good visibility, and no potential obstructions.  Make sure you are in a position to safely and repeatedly attain the necessary speeds to perform the bed-in procedure.  A controlled racetrack is the best place to perform this procedure.  AP Racing and Competition Motorsport in no way suggest or condone speeding on public roads or breaking the law in your car, nor do we take responsibility for any damage or injury that occurs as a result of using our product or these procedures.  You are performing the bed-in procedure at your own risk.  During these procedures, it’s critical that you never come to a complete stop with your foot on the brake pedal.  If you have brake ducts on your car, you may want to block them off to allow your brake system to heat up easily. The procedure outlined below is a generic procedure for most types of mild race pad.  Please check your pad manufacturer’s recommended bed-in procedure. Accelerate to approximately 60mph and then decelerate down to 5 mph.  If your car has ABS, you should try to hold the brakes at a point just before ABS intervention.  Once the car slows to 5mph, immediately accelerate back up to about 60mph, and brake again to roughly 5mph.  Repeat this series of stopping and accelerating 8 to 10 times.  Again, do not come to a complete stop with your foot on the brake pedal. Cool the brake system down by cruising at 45mph+ for 5 to 10 minutes. Visually inspect your discs.  They should be a blue/grey color (instead of shiny silver), and have an even layer of pad material across and around the entire rotor face. If the AP Racing rotors don’t have a layer of pad material on them, perform another series of stops in the manner outlined above.