Subaru

Girodisc GP-Series Rear Brake Pads 6027  Subaru WRX STI ('18+) Girodisc GP-Series rear pads for the 2018+ Subaru WRX STI deliver race-bred braking performance with three compound options to match your driving style. All variants use the GP 6027 pad shape and are designed exclusively for Girodisc Iron Conversion rear rotor systems, providing consistent modulation, excellent heat control, and dependable pedal feel. Fits the Following Vehicles: Make Model Years Front Rear Subaru WRX STI (Girodisc Iron Conversion) 2018–2021 X Available Compounds GP10 Street CompoundIdeal for daily driving and spirited canyon or light track use. Low dust, excellent cold bite, smooth modulation, and stable friction without excessive rotor wear. GP35 Race CompoundA versatile track-focused pad with stronger initial bite, higher temperature capacity, and excellent modulation—great for aggressive HPDE or sprint racing. GP40 Sprint Race CompoundHigh-friction sprint compound engineered for short, intense sessions. Delivers immediate bite, firm pedal feel, and reliable release characteristics under high heat. Features • Direct replacements for Girodisc pad shape 6027• Stable friction across a wide temperature range• Excellent heat control and pedal modulation• Designed exclusively for Girodisc Iron Conversion rear systems• Sold/priced per axle set Specifications • Pad Shape: 6027• Position: Rear• Compounds Available: GP10, GP35, GP40• Vehicle Fitment: Subaru WRX STI (2018–2021) with Girodisc rear setup• Compatibility: Girodisc Iron Conversion systems only• Contents: One axle set (pair of pads) Girodisc GP-Series Pad FAQs Do these pads fit the OEM Brembo rear calipers and rotors? No. These pads are sized for Girodisc Iron Conversion rear systems and are not intended for factory rotors. Which compound should I pick for mostly street use? GP10. It offers low dust, quiet operation, and strong cold performance with predictable pedal feel. Can I run GP35 or GP40 on the street? You can, but expect more noise/dust and reduced cold bite compared to GP10—these compounds are optimized for higher track temperatures. Do these pads require bedding? Yes. Proper bedding is essential to establish an even transfer layer and achieve maximum braking performance and consistency.

D1-185 Girodisc Subaru WRX STI (2018+) Front Replacement Rings Bring your WRX STI’s braking system back to full strength with Girodisc D1-185 340 mm front replacement rings. These high-performance rings bolt directly to your existing Girodisc aluminum hats using the included floating hardware kit. Each ring is CNC-machined from Girodisc’s proprietary high-carbon iron alloy for superior thermal control, consistent bite, and fade-resistant performance in street or track conditions. Vehicle Fitment Compatible with:• Subaru WRX STI (2018 and newer, Brembo 6-piston front calipers)Note: Designed for Girodisc 340 mm two-piece front rotor systems. Not compatible with OEM one-piece rotors or earlier 4-piston STI setups. Features • Sold as a left/right pair with complete floating hardware kit• Direct replacements for Girodisc 340 mm two-piece front rotors• High-carbon iron construction for stable performance at high temperatures• Directional curved vanes improve airflow and cooling efficiency• Maintains OEM brake bias and ABS calibration• Precision-balanced for quiet, vibration-free operation• Designed exclusively for Girodisc aluminum hats Specifications • Diameter: 340 mm• Position: Front• Material: High-carbon cast iron• Mount type: Floating two-piece system• Includes: Two rotor rings and new hardware kit• Sold/priced per pair Girodisc D1-185 Subaru WRX STI (2018+) Front Replacement Ring FAQs Do these fit directly on the OEM Subaru rotor hats? No. The D1-185 rings are specific to Girodisc aluminum hats and will not fit factory one-piece rotors. What torque should I use for the drive-pin bolts? Girodisc recommends 12 ft-lbs (16 Nm) with blue Loctite applied to each fastener; safety-wire if desired for track use. Are these compatible with aftermarket pads like Ferodo DS2500 or Hawk DTC-60? Yes. These rings work with all STI-fit pad compounds and perform best after a proper bedding cycle. How long do these typically last under heavy track use? Track-driven STIs see roughly 25–35 hours of hard use per set; street cars often exceed 50,000 miles depending on pad material and driving style. Enhance your Subaru WRX STI with Girodisc D1-185 340 mm front replacement rings — precision-engineered for heat resistance, longevity, and confidence lap after lap.

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 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.