GiroDisc Racing Brakes & Technologies
D2-146 Girodisc Porsche 380mm Rear Replacement Rings
$1,476.00
Girodisc Porsche 380mm Rear Rings
The Girodisc D2-146 rear replacement rings are designed as direct-fit replacements for the 380mm Girodisc two-piece rotor system on Porsche 991 and 992 GT3 models. Each set includes left and right rings plus all new floating hardware required for installation, allowing you to restore your braking performance without replacing the full rotor assembly.
Vehicle Fitment
Compatible with:• Porsche 991 GT3 / GT3 RS (rear, 380mm Girodisc two-piece rotors)• Porsche 992 GT3 / GT3 RS (rear, 380mm Girodisc two-piece rotors)Note: For use only with Girodisc two-piece rotor systems. Not compatible with OEM or PCCB rotors.
Features
• Sold as a left/right pair and includes new floating hardware• Direct replacements for Girodisc 380mm two-piece rear rotors• Precision CNC-machined from high-carbon cast iron• 48 curved directional vanes improve airflow and heat management• Maintains factory brake bias 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 D2-146 Replacement Ring FAQs
Will these fit OEM Porsche rotors? No. These rings are engineered for Girodisc two-piece rotor systems only and are not compatible with OEM or PCCB setups.
Are both sides included? Yes. The D2-146 kit includes both left and right replacement rings along with new floating hardware.
Why replace just the rings instead of the full rotor? It saves cost and allows you to retain your Girodisc hats while restoring full braking performance.
Do I need to use the new hardware? Yes. Each set includes new hardware that must be used to ensure proper fitment, torque, and reliability.
Upgrade your Porsche’s braking performance with Girodisc D2-146 rear replacement rings — engineered for precision, durability, and fade-free performance on both road and track.
GiroDisc Racing Brakes & Technologies
D2-147 Girodisc Corvette C7 Z06 / Grand Sport Rear Replacement Rotor Rings
$1,046.00
Girodisc Corvette C7 Z06 / Grand Sport Rear Replacement Rotor Rings
The Girodisc D2-147 Rear Replacement Rotor Rings are precision-engineered replacements for Girodisc two-piece rear rotors used on the Chevrolet Corvette C7 Z06 and Grand Sport. Designed to restore braking performance and maintain Girodisc’s unmatched cooling efficiency, these rings deliver lightweight strength, balance, and durability for both street and track use.
Vehicle Fitment
• Chevrolet Corvette C7 Z06 – Rear• Chevrolet Corvette C7 Grand Sport – Rear• Designed for Girodisc two-piece rotor systems• Will not fit OEM or non-Girodisc two-piece rotors
High-Performance Construction for the C7 Platform
Each Girodisc D2-147 replacement ring is manufactured in the USA using Girodisc’s proprietary high-carbon cast iron alloy, developed for superior strength and thermal stability. The internal curved vane design acts as a centrifugal air pump, forcing cooling air through the disc to minimize fade and maintain consistent braking under the most demanding conditions. Sold as a matched pair, the rings include new hardware and are a direct bolt-on fit to your existing Girodisc aluminum hats.
Features
• Size: 370mm x 30mm• Direct replacement for Girodisc Corvette C7 Z06 / Grand Sport rear rotors• Proprietary high-carbon iron alloy poured and machined in the USA• Curved vane internal geometry for improved airflow and cooling• Includes full hardware kit (pins, bolts, washers)• Reuses Girodisc aluminum hats• Maintains OEM brake bias and ABS calibration• Sold/priced per pair ($730.00)• Not compatible with OEM or non-Girodisc hats
Girodisc D2-147 Corvette C7 Z06 / Grand Sport Rear Replacement Rotor Rings FAQs
Can I reuse my Girodisc aluminum hats? Yes. These replacement rings are designed to bolt directly onto your existing Girodisc hats using the supplied hardware kit.
Are these compatible with OEM or factory rotors? No. Girodisc rings are designed exclusively for Girodisc two-piece systems and will not fit OEM or other aftermarket hats.
What’s included in the kit? Two 370mm rear iron rotor rings (left and right) and all necessary hardware for reassembly.
Are the rotors directional? Yes. Each rotor is marked left and right and uses directional curved vanes for optimal cooling and airflow.
Do these improve performance over OEM rotors? Yes. Girodisc rotors reduce unsprung weight, improve heat dissipation, and provide consistent braking under high loads, making them ideal for both street and track performance.
Are they sold as a set? Yes. The Girodisc D2-147 Corvette C7 Z06 / Grand Sport Rear Replacement Rotor Rings are sold and priced per pair and include all required hardware.
Maintain your Corvette’s legendary braking precision with Girodisc D2-147 Rear Replacement Rotor Rings—crafted in the USA for unmatched quality, cooling, and race-proven performance.
GiroDisc Racing Brakes & Technologies
D2-154 Girodisc Porsche 390mm Rear Replacement Rotor Rings (OEM PCCB)
$1,620.00
Girodisc Porsche 390mm Rear Rotor Rings
The Girodisc D2-154 Rear Replacement Rotor Rings are precision-engineered replacements for Girodisc two-piece rear rotors on Porsche GT models. Designed to restore the braking performance, cooling capacity, and balance of your Girodisc system, these rings deliver exceptional quality and durability for both street and track use.
Vehicle Fitment
• Porsche 991 GT3 / GT3 RS – Rear• Porsche 992 GT3 / GT3 RS – Rear• Porsche 718 GT4 RS – Rear• Designed for Girodisc two-piece rotor systems• Will not fit OEM or non-Girodisc two-piece rotors
Track-Proven Engineering for Porsche GT Models
Each Girodisc D2-154 replacement ring is cast and machined in the USA using Girodisc’s proprietary high-carbon iron alloy, developed to withstand extreme heat while maintaining consistent performance. The internal curved vane design functions as a centrifugal air pump, drawing air through the rotor to maximize cooling and prevent fade. Sold as a matched pair, these replacement rings include all new hardware and mount directly to your existing Girodisc aluminum hats for a quick and precise installation.
Features
• Size: 390mm x 32mm• Direct replacement for Girodisc Porsche 991 / 992 GT3, GT3 RS, and 718 GT4 RS rear rotors• Proprietary cast iron alloy poured and machined in the USA• Curved vane internal geometry for optimal cooling and fade resistance• Includes complete hardware kit for installation• Reuses Girodisc aluminum hats• Maintains OEM brake bias and ABS calibration• Sold/priced per pair• Not compatible with OEM or other aftermarket hats
Girodisc D2-154 Porsche 390mm Rear Replacement Rotor Rings FAQs
Can I reuse my Girodisc aluminum hats? Yes. These replacement rings are designed to bolt directly onto your Girodisc aluminum hats using the included hardware kit.
Are these compatible with OEM or other brands? No. Girodisc rings are engineered exclusively for Girodisc two-piece rotor systems and will not fit OEM or other aftermarket hats.
What’s included in the kit? Two rear iron rotor rings (left and right) and all new hardware required for installation.
Are the rotors directional? Yes. Each rotor features directional curved vanes to ensure optimal cooling—be sure to install left and right sides correctly.
Do these improve performance over OEM rotors? Absolutely. Girodisc rotors run cooler, resist warping, and offer superior braking consistency under repeated high-temperature conditions compared to OEM discs.
Are they sold as a pair? Yes. The Girodisc D2-154 Porsche 390mm Rear Replacement Rotor Rings are sold and priced per pair and include all necessary hardware for installation.
Maintain your Porsche GT car’s world-class braking performance with Girodisc D2-154 Rear Replacement Rotor Rings—crafted in the USA to deliver unmatched cooling, precision, and endurance on track or street.
GiroDisc Racing Brakes & Technologies
D2-155 Girodisc Rear Replacement Rotor Rings
$1,476.00
D2-155 Girodisc Rear Replacement Rotor Rings
One pair of Girodisc 380mm steel replacement rotor rings for the Girodisc A2-155 two-piece floating rotor system for the Porsche Cayman GT4 with oem steel brakes. Includes all necessary hardware to safely replace both worn rotor rings.
INCLUDES TWO REPLACEMENT ROTOR RINGS AND ASSOCIATED HARDWARE.
GiroDisc Racing Brakes & Technologies
D2-156 Girodisc Rear Replacement Rotor Rings
$1,476.00
D2-156 Girodisc Rear Replacement Rotor Rings
REPLACEMENT ROTOR DISCS 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 grade 12 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.
GiroDisc Racing Brakes & Technologies
D2-162 Girodisc 2pc Rear Replacement Discs | Shelby GT350/GT350R (2015+)
$1,261.00
Girodisc Ford GT350/GT350R Rear Rotor Rings
Rear Fitment, Ford Shelby GT350/GT350R with Girodisc A2-162 rotors
The Girodisc D1-162 is the direct replacement rotor rings for your Girodisc A2-162 brake rotor kit. This complete kit consists of two new discs (rotor rings) and all replacement hardware. You will re-use the Girodisc aluminum hats from your A2-162 kit and bring your braking feel back to new.
Girodisc GT350 Rear Rotor Rings Details
Manufacturer: Girodisc
Manufacturer Part Number: D2-162
Surface: Slotted
Material: Steel
Intended for Street/Track Use: Yes
For Use with Stock Calipers: Yes
Rotor Construction: Vented
Rotor Style: Slotted surface
Rotor Material: Iron
Rotor Finish: Black E-coat
Quantity: Sold pair (one axle set)
Sold/priced per pair of rings only (does not include center hat and does NOT fit OEM hats.)
Girodisc Advantages
Girodisc brake kits are seen at every track weekend on very exotic and extreme track cars. What made Girodisc owners leave their OEM rotors and upgrade to a 2 piece Girodisc kit?
Less Rotating Mass via two-piece design
Grade 12 floating hardware to allow the rotor to grow when heated
Curved vane design creates a cooler rotor
Significant cost reduction compared to OEM
Girodisc Floating Rotor Rings
Quality hi-carbon cast iron is the foundation of every Girodisc brake rotor. Every rotor ring is made carefully in house at the Girodisc factory in Washington state. The Girodisc rotor utilizes a curved vane design that was originally developed in racing to act as a centrifugal air pump to force cooling air from the center of the rotor ring to the outside. This principle is similar to what is know as a squirrel cage fan design. By having impellers (vanes) between the two rotor faces, the air is moved radially, from the center outward, changing the direction of the airflow and increasing velocity. This design is mechanically strong, reliable, and very effective.
Girodisc Rotor Ring Hardware
The Girodisc rotor ring and light-weight aluminum hat have a floating mount system, which utilizes 8 or 10 high strength alloy steel drive pins, manufactured by Girodisc in the USA to their own specifications and cadmium plated for long-lasting corrosion resistance. These drive pins take the load from braking actions while maintaining the axial and radial float between the hat and disc. The drive pins are secured by grade 12 cap screws with hardened washers. In order to keep the rotors from making noise when cold, the pins are mounted with anti-noise spring washers on the rotor side which allow the rotor to grow with heat expansion but eliminate the rattle and noise associated with floating rotors. This float also allows the rotor to self-center between the pads.
Girodisc Rotor Ring Replacement
Once the Girodisc system is in place, simply replace the cast iron rotor when needed. Your Girodisc replacement rotor rings come complete with two new rotor rings and all required floating rotor hardware. This is a very simple task that is quite fun. The aluminum rotor hat usually does not ever need replacement unless bent or damaged. If you damaged has reached your Girodisc hat, you likely have more than a few other things to replace also. The hat is rugged and overly strong.
GiroDisc Racing Brakes & Technologies
D2-166 Girodisc Honda Civic Type R Rear Replacement Rings
$903.00
Girodisc Honda Civic Type R Rear Rings
Refresh the braking performance on your Honda Civic Type R (FK8 or FL5) with the Girodisc D2-166 rear replacement rings. These are direct-fit rings designed to bolt onto your existing Girodisc two-piece rotor hats — complete with new hardware, letting you replace only the outer wear surface while keeping your rotor hats in place.
Vehicle Fitment
Compatible with:• 2017-2024 Honda Civic Type R (FK8 & FL5) – rear application only, with Girodisc two-piece rotor system
Features
• Sold as a pair (left & right) and includes new hardware kit• Direct replacement rings for Girodisc two-piece rear rotors• Machined from high-carbon iron for excellent thermal performance and durability• Maintains factory braking bias and ABS functionality when properly installed• Requires Girodisc aluminum hats — not compatible with OEM or other brand hats
Specifications
• Material: High-carbon cast iron• Mount type: Floating two-piece rotor system• Includes: Two rings and full hardware kit• Position: Rear• Sold/priced per pair
Girodisc D2-166 Replacement Ring FAQs
Will these fit non-Girodisc rotor hats? No. These replacement rings are only compatible with Girodisc two-piece rotor hats and will not bolt onto OEM or other aftermarket hats. :contentReference[oaicite:1]{index=1}
Are both sides included in the kit? Yes. The D2-166 kit contains left and right rear rings along with the required hardware kit for installation. :contentReference[oaicite:2]{index=2}
Why replace just the rings instead of the full rotor? Replacing only the rings allows you to refresh the braking surface, maintain the high-quality Girodisc hats, reduce cost, and avoid unnecessary full rotor replacement when the hats are still in good condition. :contentReference[oaicite:3]{index=3}
Can I reuse my old mounting hardware? No. New floating hardware is included with each set and should be used for proper fitment and safety. :contentReference[oaicite:4]{index=4}
Upgrade your Honda Civic Type R’s braking system with Girodisc D2-166 rear replacement rings — engineered for consistent stops, high performance, and track-ready durability.
GiroDisc Racing Brakes & Technologies
D2-168 Girodisc Rear Replacement Rotor Rings | Gallardo Super Trofeo
$1,362.00
Girodisc D2-168 Replacement Rear Rotor Ring Kit
REPLACEMENT ROTOR RINGS & NEW INSTALLATION HARDWARE. DOES NOT INCLUDE ALUMINUM HATS.
Competition Motorsport is an authorized dealer for Girodisc products. As one of the largest stocking dealers in the country, we ship most Girodisc products the same or next business day to ensure we meet your delivery deadline.
These Girodisc replacement rotor rings are direct replacements for the iron discs on your Girodisc two-piece rotors, and no modifications are necessary. New cap screws and washers are included with these replacement rotors. We do not recommend re-using the old hardware.
The replacement rotor rings 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 their 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 grade 12 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 two-piece Girodisc design allows for rotor ring-only replacement to minimize replacement costs and deliver outstanding performance and cooling.
Sold/priced per pair.
GiroDisc Racing Brakes & Technologies
D2-169 Girodisc Ford Focus RS Rear Replacement Rings
$903.00
Girodisc Ford Focus RS Rear Rings
Restore your Focus RS braking system with Girodisc D2-169 rear replacement rings. These are direct-fit replacements for Girodisc two-piece rotors, designed to bolt directly onto your existing aluminum hats using the included hardware. Save money by replacing only the wear surface while keeping your high-quality Girodisc hats.
Vehicle Fitment
Compatible with:• 2016–2018 Ford Focus RS (rear application only, with Girodisc two-piece rotor system)
High-Performance Construction
Each Girodisc replacement ring is cast from a proprietary high-carbon iron alloy and precision-machined in the USA. The curved directional vanes act as centrifugal pumps to draw cooling air through the rotor, improving temperature control and braking consistency. This design reduces fade under heavy braking while extending pad and rotor life.
Features
• Sold as a matched left/right pair• Includes new floating hardware kit• 48 curved directional vanes for superior cooling• Maintains factory brake bias and ABS calibration• Designed exclusively for Girodisc hats – not compatible with OEM or other brands
Specifications
• Diameter: 302 mm• Position: Rear• Material: High-carbon cast iron• Mount type: Floating two-piece system• Includes: Two rings and full hardware kit• Made in the USA• Sold/priced per pair
Girodisc D2-169 Replacement Ring FAQs
Will these fit OEM Ford rotors? No. These are engineered specifically for Girodisc two-piece rotor assemblies and will not bolt to factory Ford hats.
Are both sides included? Yes. Each kit includes both left and right rear rings, plus new hardware for installation.
Why replace just the rings instead of the full rotor? Replacing only the rings saves cost while maintaining your high-quality Girodisc hats and preserving the floating system’s performance benefits.
Can I reuse my old hardware? No. Each kit includes brand-new hardware that must be used for correct fitment and safety.
Upgrade your Ford Focus RS braking perform
GiroDisc Racing Brakes & Technologies
D2-170DS Girodisc Mercedes 365x26mm Rear Replacement Rings (Dimpled & Slotted)
$1,405.00
Girodisc Mercedes 365x26mm Rear Replacement Rings (Dimpled & Slotted)
Restore your Mercedes’ braking performance with Girodisc D2-170DS 365x26mm dimpled and slotted rear replacement rings. Designed as direct replacements for Girodisc two-piece rotors, these precision-engineered rings combine enhanced cooling with improved pad bite and reduced fade under hard braking.
Vehicle Fitment
Compatible with:• Mercedes-Benz S63 AMG (W222, W221)• Mercedes-Benz CL63 AMG (C216)• Mercedes-Benz SL63 AMG (R231)• Mercedes-Benz CLS63 AMG (C218)Note: These are friction rings only. They attach to existing Girodisc aluminum hats using the included floating hardware kit.
Precision Machined for High-Performance Braking
Each Girodisc ring is cast from a proprietary high-carbon iron alloy and machined in-house in the USA. The curved internal vanes act as centrifugal pumps to maximize airflow through the rotor, significantly improving heat dissipation during repeated heavy braking. The dimpled and slotted surface increases pad bite and keeps the braking face cleaner for consistent performance on both road and track.
Features
• Direct replacements for Girodisc 365x26mm rear rotors• Dimpled and slotted design enhances pad bite and debris removal• High-carbon iron alloy for improved heat resistance• Directional curved vanes provide superior cooling• Precision machined and balanced in the USA• Includes new floating hardware kit• Sold/priced per pair
Specifications
• Diameter: 365mm• Thickness: 26mm• Position: Rear• Material: High-carbon cast iron• Includes: Two rotor rings and complete hardware kit• Finish: Dimpled and slotted surface• Made in the USA• Sold/priced per pair
Girodisc D2-170DS Replacement Ring FAQs
Will these fit OEM Mercedes rotors? No. These rings are designed exclusively for Girodisc two-piece rotor assemblies.
What’s the advantage of the dimpled and slotted design? It improves initial pad bite, helps expel gases, and maintains consistent friction levels during repeated braking cycles.
Are these suitable for daily driving? Yes. Girodisc rotors offer quiet operation on the street while providing race-level performance when pushed hard.
Do they come with new hardware? Yes. Each set includes a complete hardware kit with new drive pins, bolts, and washers for easy installation.
Upgrade or refresh your AMG’s braking system with Girodisc D2-170DS rear replacement rings — the ideal balance of precision, durability, and performance for the world’s best performance sedans and coupes.
GiroDisc Racing Brakes & Technologies
D2-173 Girodisc Rear Rotor Ring Replacements
$1,003.00
REPLACEMENT ROTOR RINGS ONLY. INCLUDES NEW INSTALLATION HARDWARE. DOES NOT INCLUDE ALUMINUM HATS.
Competition Motorsport is an authorized dealer for Girodisc products. As one of the largest stocking dealers in the country, we ship most Girodisc products the same or next business day to ensure we meet your delivery deadline.
These Girodisc replacement rotor rings are direct replacements for the iron discs on your Girodisc two-piece rotors, and no modifications are necessary. New cap screws and washers are included with these replacement rotors. We do not recommend re-using the old hardware.
The replacement rotor rings 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 their 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 grade 12 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 two-piece Girodisc design allows for rotor ring-only replacement to minimize replacement costs and deliver outstanding performance and cooling.
Sold/priced per pair.
GiroDisc Racing Brakes & Technologies
D2-174 Girodisc Acura NSX Rear Replacement Rings
$1,476.00
Girodisc Acura NSX Rear Replacement Rings
Refresh your Acura NSX’s braking performance with Girodisc 350mm rear replacement rings. Built for precision and endurance, these high-carbon iron rings are direct replacements for Girodisc two-piece rotors, maintaining your NSX’s balance of power, control, and stopping confidence.
Vehicle Fitment
Compatible with:• 2017–2022 Acura NSX (NC1)• 1991–2005 Acura NSX (with Girodisc or compatible 350mm rear rotor systems)Note: These are friction rings only. They mount directly to existing Girodisc aluminum hats using the included floating hardware kit.
Precision-Built for Consistent Braking
Each Girodisc replacement ring is cast from a proprietary high-carbon iron alloy and machined to exacting tolerances in the USA. The rotor’s directional curved vane design acts as a centrifugal air pump, drawing cooling air through the rotor to reduce heat buildup and prevent brake fade. Whether you’re carving backroads or pushing your NSX to its limits on track, Girodisc ensures reliable braking with smooth pedal feedback and long-term durability.
Features
• Direct replacement for 350mm Girodisc rear rotor assemblies• Designed for Acura NSX (NC1) and earlier models equipped with Girodisc systems• High-carbon cast iron delivers superior heat stability and longevity• Curved directional vanes maximize airflow and cooling• Precision machined and balanced in the USA• Includes full floating hardware kit• Sold/priced per pair
Specifications
• Diameter: 350mm• Position: Rear• Material: High-carbon cast iron• Includes: Two rotor rings and full hardware kit• Made in the USA• Sold/priced per pair
Girodisc D2-174 Replacement Ring FAQs
Will these fit factory NSX brake setups? No. These are designed for use with Girodisc two-piece rotor systems or equivalent aftermarket aluminum hats.
Do these include new hardware? Yes. Each set includes new floating hardware—pins, bolts, and washers—for a complete, ready-to-install replacement.
Are these compatible with both NSX generations? Yes. They fit directly on second-gen (NC1) NSX models and first-gen NSX cars equipped with Girodisc 350mm rear brake kits.
What makes Girodisc rotors better than OEM? Girodisc rotors are lighter, cooler-running, and fully serviceable. The two-piece design allows you to replace just the iron rings instead of the entire rotor assembly, saving cost over time.
Upgrade your NSX’s stopping power with Girodisc D2-174 350mm rear replacement rings — race-proven performance, precision manufacturing, and American quality in every set.
GiroDisc Racing Brakes & Technologies
D2-183 Girodisc Ferrari 458 / 488 Challenge Rear Replacement Rings
$1,505.00
Girodisc Ferrari 458, 488 Challenge Rear Replacement Rings
Keep your Ferrari Challenge brakes at their best with Girodisc 458 / 488 Challenge rear replacement rings. Designed as direct replacements for existing Girodisc two-piece rotor assemblies, these 380mm iron rings deliver exceptional thermal performance and braking consistency under extreme racing conditions.
Vehicle Fitment
Compatible with:• Ferrari 458 Challenge• Ferrari 488 Challenge• Ferrari 488 Challenge EvoNote: These are replacement friction rings only. They install on existing Girodisc aluminum hats using the included hardware kit.
Race-Proven Engineering
Each Girodisc replacement ring is cast and machined in the USA using a proprietary high-carbon iron alloy for superior heat dissipation and durability. The rotor’s curved vane design functions as a centrifugal pump, pulling air through the disc to keep temperatures stable during heavy braking. This ensures consistent performance and fade resistance, lap after lap. All machining and assembly are completed in-house at Girodisc’s facility for maximum precision and quality control.
Features
• Direct replacement for Girodisc rear two-piece assemblies• Compatible with 458, 488, and 488 Challenge Evo applications• High-carbon cast iron resists cracking under endurance heat cycles• Curved vane internal cooling for maximum airflow• Precision machined and balanced in the USA• Includes full hardware kit for installation• Sold/priced per pair
Specifications
• Diameter: 380mm (approx.)• Position: Rear• Material: Proprietary high-carbon cast iron• Includes hardware kit• Made in the USA• Sold/priced per pair
Girodisc D2-183 Replacement Ring FAQs
Are these compatible with OEM carbon-ceramic brakes? No. These are for vehicles equipped with Girodisc iron conversion rotors or existing Girodisc two-piece systems.
Do these rings include new hardware? Yes. Each pair ships with a complete hardware kit containing new floating pins, bolts, and washers.
Can I reuse my Girodisc hats? Absolutely. These rings are designed to mount directly to your existing aluminum hats using the supplied fasteners.
How often should I replace the rings? Replacement intervals depend on use — typically every 2–3 race seasons for endurance cars, or when the rotor reaches the minimum thickness or shows heat cracking to the edge.
Upgrade your Ferrari Challenge braking system with Girodisc D2-183 rear replacement rings — precision-engineered for maximum cooling, durability, and repeatable performance on the track.
GiroDisc Racing Brakes & Technologies
D2-184 Girodisc Corvette C6 ZR1 Rear Replacement Rings
$1,261.00
Girodisc Corvette C6 ZR1 Rear Replacement Rings
Restore top-tier braking performance on your C6 ZR1 with Girodisc rear replacement rings. Designed as a direct fit for Girodisc two-piece rotor assemblies, these rings maintain factory brake balance and deliver superior cooling, consistent pedal feel, and long-lasting durability under extreme braking loads.
Vehicle Fitment
Compatible with:• Chevrolet Corvette C6 ZR1 (2009–2013)Note: These are replacement rotor rings only. They bolt directly to existing Girodisc aluminum hats and include new hardware for installation.
Precision Replacement for Maximum Performance
Each Girodisc rotor ring is machined from a proprietary high-carbon iron casting formulated for superior heat tolerance and structural integrity. The curved vane internal design acts as a centrifugal pump, drawing cool air through the disc to reduce operating temperatures and prevent brake fade during extended track sessions. When paired with Girodisc’s floating hat assemblies, these rings provide smooth, quiet operation while maintaining optimal braking balance.
Features
• Direct replacement for Girodisc rear rotors on the C6 ZR1• Machined from Girodisc proprietary high-carbon iron• Curved directional vane design enhances airflow and cooling• Includes new high-strength hardware kit for reassembly• Compatible with Girodisc aluminum hats only• Made and machined in the USA• Sold/priced per pair
Specifications
• Application: Rear axle• Vehicle: Chevrolet Corvette C6 ZR1 (2009–2013)• Material: High-carbon cast iron• Includes replacement hardware• Made in the USA• Sold/priced per pair
Girodisc D2-184 Replacement Ring FAQs:
Are these complete rotors? No. The D2-184 rings are replacement friction rings only and are designed to bolt to your existing Girodisc aluminum hats using the included hardware.
Do they fit factory GM rotors? No. These rings are made exclusively for Girodisc two-piece rotor assemblies and will not fit OEM or other aftermarket hats.
What comes in the box? Each set includes two high-carbon iron rings and all new mounting hardware required for reinstallation.
When should I replace my rings? Girodisc recommends replacing rings when they reach minimum thickness or show cracks extending to the edge. This ensures consistent braking performance and safety under high heat.
Maintain peak stopping power on your C6 ZR1 with Girodisc D2-184 replacement rings — engineered for durability, rebuildability, and championship-level performance.
GiroDisc Racing Brakes & Technologies
D2-185 Girodisc Subaru WRX STI (’18+) Rear Replacement Rotor Rings
$903.00
Girodisc D2-185 Subaru WRX STI (’18+) Rear Replacement Rotor Rings
The Girodisc D2-185 Rear Replacement Rotor Rings are precision-engineered replacements for Girodisc two-piece rear rotors on the 2018 and newer Subaru WRX STI. Designed to restore braking performance and durability, these iron rings provide the same cooling efficiency and lightweight characteristics as your original Girodisc setup—perfect for both spirited street driving and track use.
Vehicle Fitment
Compatible with all 2018+ Subaru WRX STI models, these rings are a direct-fit solution for Girodisc two-piece rear rotor systems and are not compatible with OEM or non-Girodisc hats.
Direct Replacement for 2018+ WRX STI Rear Rotors
Each Girodisc D2-185 replacement ring is cast and machined in the USA using Girodisc’s proprietary iron alloy for outstanding thermal capacity and strength. The curved vane internal design acts as a centrifugal air pump, pulling air through the rotor to lower operating temperatures and reduce brake fade. Sold as a pair, these rings come with a full hardware kit and mount directly to your existing Girodisc aluminum hats for a hassle-free installation.
Features
• Size: 316mm x 20mm• Direct replacement rings for Girodisc Subaru WRX STI (’18+) rear rotors• Proprietary cast iron alloy poured and machined in the USA• Curved vane internal geometry for superior cooling and fade resistance• Includes complete hardware kit (drive pins, washers, and bolts)• Reuses Girodisc aluminum hats• Maintains OEM brake bias and ABS function• Sold/priced per pair• Not compatible with OEM or other aftermarket hats
Girodisc Subaru WRX STI (’18+) Rear Replacement Rotor Rings FAQs
Can I reuse my Girodisc aluminum hats? Yes. These replacement rings are designed to bolt directly to your Girodisc hats using the included hardware kit.
Are these compatible with OEM or factory rotors? No. Girodisc rings are engineered specifically for Girodisc systems and will not fit OEM or other aftermarket hats.
What’s included in the kit? Two iron rotor rings (left and right) and all necessary hardware for assembly.
Are the rotors directional? Yes. Each ring features directional curved vanes for optimal airflow—make sure to install the correct left and right rotors.
Do these improve performance over OEM rotors? Yes. Girodisc rotors offer better heat dissipation, improved consistency, and longer service life, especially under repeated heavy braking.
Are they sold as a pair? Yes. The Girodisc D2-185 Subaru WRX STI (’18+) Rear Replacement Rotor Rings are sold and priced per pair and include all hardware for installation.
Restore the precision braking feel of your WRX STI with Girodisc D2-185 Rear Replacement Rotor Rings—crafted in the USA for superior cooling, durability, and performance lap after lap.
GiroDisc Racing Brakes & Technologies
D2-186 Girodisc BMW F8X 368mm Rear Replacement Rings
$1,204.00
Girodisc BMW F8X 368mm Rear Replacement Rings
Bring your BMW’s braking performance back to peak condition with Girodisc D2-186 rear replacement rings. Designed as direct replacements for Girodisc two-piece 368mm rotors, these precision-engineered rings restore the balance, cooling, and bite that performance driving demands—whether on the street or at the track.
Vehicle Fitment
Compatible with:• BMW F80 M3 (2015–2018)• BMW F82 M4 (2015–2020)• BMW F83 M4 Convertible (2015–2020)• BMW F87 M2 Competition (2019–2021)• BMW F87 M2 CS (2020–2021)Note: For vehicles originally equipped with iron rotors. These rings attach directly to Girodisc aluminum hats using the included floating hardware kit.
Precision-Machined for High Performance
Each Girodisc rotor ring is cast from a proprietary high-carbon iron alloy and machined entirely in the USA. The directional curved vanes draw cooling air through the rotor for exceptional temperature control under hard braking. This design minimizes fade, maintains pedal feel, and extends pad life—perfect for both road and track environments.
Features
• Direct replacements for Girodisc 368mm rear rotors• Compatible with BMW F8X M3/M4 and F87 M2 Competition & CS• Proprietary high-carbon cast iron construction• Directional curved vane design for optimal cooling• Machined, balanced, and finished in the USA• Includes complete floating hardware kit• Sold/priced per pair
Specifications
• Diameter: 368mm• Position: Rear• Material: High-carbon cast iron• Includes: Two rotor rings and new hardware kit• Made in the USA• Sold/priced per pair
Girodisc D2-186 Replacement Ring FAQs
Do these fit factory BMW rotors? No. These are designed exclusively for Girodisc two-piece rotor assemblies and will not fit OEM rotors.
Are these track-ready? Yes. Girodisc rotors are engineered to deliver consistent performance and cooling during high-speed, high-temperature driving.
Is new hardware included? Yes. Each pair ships with fresh floating hardware for secure installation.
When should I replace the rings? Replace when the rotor surface is below minimum thickness or cracks extend to the outer edge.
Rebuild your braking system with Girodisc D2-186 rear replacement rings—precision-engineered for BMW M performance and proudly made in the USA.
