Racing Brake Rotors

Girodisc VW Golf R (Mk8), Audi 8Y S3 Front Rotors Upgrade your Volkswagen Golf R or Audi S3 braking system with Girodisc lightweight two-piece front rotors. Designed for precision, durability, and cooling efficiency, these rotors deliver sharper response and reduced fade for both spirited street driving and demanding track sessions. The fully floating design reduces unsprung and rotating mass, improving handling and braking control without altering factory balance or ABS performance. Vehicle Fitment Compatible with:• Volkswagen Golf R (Mk8, 2022+)• Audi S3 (8Y, 2022+)Direct OEM replacement – bolts to factory hubs and calipers, no modifications required.Sold and priced per pair. Race-Developed, Street-Refined Performance Each Girodisc 2-piece rotor assembly replaces the factory one-piece iron disc with a lightweight floating design. The friction rings are machined from Girodisc’s proprietary high-carbon iron casting, developed for exceptional strength and thermal stability under high-stress braking. The 72 curved vanes function as internal air pumps, drawing cool air through the disc for maximum heat dissipation and fade resistance. Paired with CNC-machined 6061-T6 aluminum hats finished in black anodize, these rotors strike the perfect balance between weight reduction and durability. Features • Direct OEM replacement for VW Golf R (Mk8) and Audi 8Y S3 front rotors• Two-piece floating design reduces unsprung and rotational mass• CNC-machined 6061-T6 aluminum hats, black anodized for corrosion resistance• Proprietary high-carbon cast iron rotor rings for improved heat control• 72 curved cooling vanes efficiently manage thermal load• Fully rebuildable – reuse hats with replacement rings (P/N D1-288)• Precision-assembled using cadmium-plated hardware and spring clip float control• Made and assembled in Bellingham, WA from U.S.-sourced materials• Minimum recommended ring thickness: 32mm Specifications • Application: Front axle• Material: High-carbon cast iron with 6061-T6 aluminum hat• Vane count: 72 curved directional• Replacement ring part number: D1-288• Made in the USA• Sold/priced per pair Girodisc A1-288 Front Rotor FAQs: Do these rotors fit both the Mk8 Golf R and 8Y Audi S3? Yes. The A1-288 Girodisc rotors are designed for direct fitment on both the Volkswagen Golf R Mk8 and the Audi S3 8Y chassis, using factory calipers and hardware. How much weight do these rotors save? The two-piece design significantly reduces unsprung weight compared to OEM rotors, improving steering feedback and suspension responsiveness. Can the iron rings be replaced? Yes. Girodisc rotors are fully rebuildable—simply reuse the aluminum hats and install new rings (part number D1-288) when the originals reach minimum thickness or wear limits. Are these rotors suitable for track days? Absolutely. Girodisc rotors are engineered for motorsport-level heat management while remaining quiet and reliable for street use, offering the best balance of performance and longevity. Upgrade your Golf R or S3 with Girodisc two-piece rotors to experience unmatched stopping precision, reduced weight, and consistent performance lap after lap.

A1-291 Girodisc Porsche 718 GT4 RS Front Rotors (408×36 mm) Price: $1,950.00 These Girodisc A1-291 2-piece front rotors are a direct replacement for the Porsche 718 GT4 RS with the factory iron brake system. Weighing about ~29 lb per rotor, the fully floating design reduces unsprung/rotational mass while retaining OEM calipers, ABS, and brake bias. Vehicle Fitment Porsche 718 Cayman GT4 RS (982) – Front, OEM iron brakes (not PCCB) High-Carbon Rings & Curved-Vane Cooling The rotor rings are machined from a proprietary high-carbon iron casting for durability and heat capacity. Curved internal vanes (72-vane) act as a centrifugal pump to pull cooling air through the disc under hard use. The 2-piece construction allows reuse of the aluminum hat with D1-291 replacement rings. Dimensions Diameter: 408 mm Thickness: 36 mm Weight: ~29 lb per rotor assembly Features Direct OEM replacement; no modifications required 2-piece floating design reduces unsprung & rotational mass Reusable 6061-T6 aluminum hats; cadmium-plated hardware Manufactured and assembled in Bellingham, WA Sold/priced per pair A1-291 FAQs Does this fit PCCB cars? No — this listing is for cars with OEM iron rotors. Minimum service thickness? Replace when rings reach 34 mm, or earlier if a crack reaches the outer edge. Which replacement rings? D1-291 (pair, with hardware) for Girodisc hats.

A1-294 Girodisc Maserati MC20 Front Rotors These Girodisc A1-294 2-piece front rotors are a direct bolt-on for the Maserati MC20 with factory carbon-ceramic front brakes. The floating design reduces unsprung/rotational mass while retaining OEM calipers and ABS. Vehicle Fitment Maserati MC20 – Front (PCCB / carbon-ceramic equipped) Curved-Vane Cooling & Durable Rings The rings are machined from proprietary high-carbon iron and use curved internal vanes that act as a centrifugal pump to pull cooling air through the rotor. The 2-piece floating construction lets you reuse the aluminum hat and swap rings easily. Features Direct replacement for MC20 factory carbon-ceramic front rotors 2-piece floating design reduces unsprung & rotational mass Reusable 6061-T6 aluminum hats; new hardware included Cadmium-plated high-strength drive pins, clips, Belleville washers Manufactured and assembled in Bellingham, WA Sold/priced per pair A1-294 FAQs Does this work for steel brake versions? No — this is for the factory carbon-ceramic (PCCB) front setup. Need new calipers or coding? No — bolts to OEM hubs and retains ABS settings.

A1-298 Girodisc Audi 8Y RS3 Front Rotors   These Girodisc A1-298 2-piece slotted front rotors are a direct bolt-on for the 2022+ Audi RS3 (8Y) with factory iron brakes. Floating construction reduces unsprung and rotational mass while preserving OE calipers, ABS, and brake bias. (For cars optioned with front carbon-ceramic brakes, see the separate Iron Conversion kit A1-355.) Vehicle Fitment Audi RS3 (8Y) 2022+ – Front Direct fit for OEM iron-brake cars. For PCCB/CCB cars, use the dedicated Iron Conversion listing. High-Carbon Rings & Curved-Vane Cooling Proprietary high-carbon iron rings and curved internal vanes act as a centrifugal pump to pull cooling air through the rotor. Spring-preloaded floating hardware allows thermal growth while minimizing noise for street use. Features Direct OE replacement; no modifications required 2-piece floating design reduces unsprung/rotational mass High-carbon iron rings; reusable 6061-T6 aluminum hats Cadmium-plated high-strength hardware with spring clips & Belleville washers Manufactured and assembled in Bellingham, WA Sold/priced per pair A1-298 FAQs Does this fit carbon-ceramic (PCCB/CCB) cars? No — for CCB cars use the A1-355 Front Iron Conversion. Do I need new calipers or brackets? No — the rotors bolt to OE hubs and work with the factory calipers.

A1-302 Girodisc Lamborghini Huracán STO Front Iron Rotor Conversion These Girodisc A1-302 2-piece rotors directly replace the factory carbon-ceramic front rotors on the Lamborghini Huracán STO. They reuse the OEM calipers and require the D1130 pad shape (iron-rotor friction compound recommended). Replacement rings later: D1-302. Vehicle Fitment 2021+ Lamborghini Huracán STO (front, CCB-equipped) High-Carbon Rings, 72 Curved Vanes Proprietary high-carbon iron with 72 curved vanes acts as a centrifugal pump to pull cooling air through the disc. Floating hardware with spring preload controls thermal growth and keeps street noise low. Features Direct CCB-to-iron conversion; OEM calipers retained 2-piece floating design reduces unsprung/rotational mass Reusable 6061-T6 aluminum hats; new hardware included 72-vane internal geometry for strong airflow Manufactured and assembled in Bellingham, WA Sold/priced per pair A1-302 FAQs Which pads do I use? D1130 pad shape in an iron-rotor compound. Any coding or spacers? No coding or spacers required for STO; designed for OEM calipers. Minimum thickness? Replace front rings at 32 mm or sooner if a crack reaches the edge. Related Products D1-302 Girodisc Lamborghini Huracán STO Front Replacement Rings A2-302 Girodisc Lamborghini Huracán STO Rear Iron Rotor Conversion D2-302 Girodisc Lamborghini Huracán STO Rear Replacement Rings

A1-306 Girodisc Porsche 992 GT3, GT3 RS Front Rotors (36mm)   These Girodisc A1-306 2-piece front rotors are a direct bolt-on for Porsche 992 GT3 and 992 GT3 RS with 36 mm-thick steel front rotors (not for PCCB). Floating construction reduces unsprung and rotational mass while preserving OE calipers, ABS, and brake bias. Vehicle Fitment Porsche 911 (992) GT3 – Front, 36 mm steel rotors (non-PCCB) Porsche 911 (992) GT3 RS – Front, 36 mm steel rotors (non-PCCB) Not compatible with PCCB (carbon-ceramic) brake packages. High-Carbon Rings & Curved-Vane Cooling The rings are machined from Girodisc’s proprietary high-carbon iron and use curved internal vanes that act as a centrifugal pump to pull cooling air through the rotor. Spring-preloaded floating hardware allows thermal expansion while minimizing noise for street use. Features Direct OE replacement; no modifications required 2-piece floating design reduces unsprung/rotational mass High-carbon iron rings; reusable 6061-T6 aluminum hats Cadmium-plated high-strength drive pins, clips, Belleville washers Manufactured and assembled in Bellingham, WA Sold/priced per pair A1-306 FAQs Does this fit PCCB cars? No. This listing is for 36 mm steel-rotor cars; PCCB uses different discs. Do I need new calipers or brackets? No — the rotors bolt to OE hubs and work with the factory calipers. Are replacement rings available? Contact us for availability; rings are sold in pairs for Girodisc hats only.

A1-307 Girodisc Toyota GR Supra, BMW 348mm Front Rotors Price: $1,150.00 These Girodisc A1-307 2-piece front rotors are a direct bolt-on for the Toyota GR Supra 3.0 and BMW G-chassis models equipped with a 348 mm front rotor. Floating construction trims unsprung/rotational mass while preserving OE caliper/ABS function. Replacement rings: D1-307. Vehicle Fitment Toyota GR Supra 3.0 (A90/A91) – Front BMW G20/G21 M340i – Front BMW G22/G23 M440i – Front BMW G20/G22 with optional M Sport brakes – Front BMW G01 X3 M40i & G02 X4 M40i – Front BMW G29 Z4 M40i – Front Above applications reflect the 348 mm front rotor package on G-chassis cars. High-Carbon Rings, 72 Curved Vanes Proprietary high-carbon iron rings use 72 curved vanes to pull cooling air through the hub for stable temperatures under repeated hard stops. Reusable 6061-T6 hats and cadmium-plated hardware maintain quiet, street-friendly float. Features Direct OE replacement; no modifications required 2-piece floating design reduces unsprung/rotational mass High-carbon iron rings; reusable aluminum hats 72-vane internal geometry for strong airflow Manufactured and assembled in Bellingham, WA Sold/priced per pair A1-307 FAQs Minimum service thickness? Replace front rings at 34 mm or sooner if a crack reaches the edge. Do these require new calipers? No — they bolt to OE hubs and run with factory calipers/ABS. Which rings fit later? D1-307 front replacement rings. Related Products D1-307 Girodisc Toyota GR Supra, BMW 348mm Front Replacement Rings A2-307 Girodisc Toyota GR Supra, BMW 345mm Rear Rotors D2-307 Girodisc Toyota GR Supra, BMW 345mm Rear Replacement Rings

A1-308 Girodisc Mercedes 360mm Front Rotors These Girodisc A1-308 2-piece slotted front rotors are a direct OEM replacement for 360 mm front discs on select Mercedes-AMG models. Bolt-on fit with stock calipers; no modifications required. Vehicle Fitment Mercedes-Benz E63 AMG (W212) 2010–2014 – Front (360 mm) Design & Performance High-carbon iron rings with 48 curved internal vanes draw cooling air through the rotor. Floating two-piece construction reduces unsprung weight while reusable aluminum hats allow ring-only replacement. Features Direct OEM replacement (360 mm) for listed AMG applications 2-piece floating rotor reduces unsprung weight vs. OE Slotted face improves pad refresh and debris evacuation High-carbon iron rings; reusable 6061‑T6 aluminum hats Approx. 23.6 lb per rotor vs. ~34.5 lb OE (application dependent) Manufactured and assembled in Bellingham, WA A1-308 Girodisc Mercedes 360mm Front Rotors FAQs: Do these rotors require new calipers or brackets? No. They bolt to the factory hubs and work with OEM calipers and pads on the listed applications. Are they directional? Yes. Each rotor has directional internal vanes; install left/right as marked to ensure proper airflow. What pads are recommended? They are compatible with OEM pads and popular street/track compounds (e.g., Ferodo DS1.11, Pagid, Hawk). Bed-in per the pad manufacturer. How do they compare to OE one-piece discs? Lower rotating mass and better heat rejection reduce fade and can improve response on track. Related Products A1-308 Girodisc Mercedes 360mm Front Rotors A2-148 Girodisc Mercedes 360mm Rear Rotors D1-308 Girodisc Mercedes 360mm Front Replacement Rings D2-123 Girodisc Mercedes 360mm Rear Replacement Rings

A1-308DS Girodisc Mercedes 360mm Front Rotors (Dimpled & Slotted) These Girodisc A1-308DS 2-piece dimpled and slotted front rotors are a direct replacement for factory 360 mm front rotors on Mercedes performance models. The floating two-piece design reduces unsprung weight and improves cooling, while the surface pattern enhances pad bite and gas evacuation. Vehicle Fitment Mercedes-AMG / Mercedes models using 360 mm front rotors Factory OEM 360 mm brake systems on select AMG / performance models High-Performance Dimpled & Slotted Design The 48 curved vane internal structure pulls cooling air through the rotor like a centrifugal pump. Combined with high-carbon iron rings and reusable aluminum hats, this design delivers excellent thermal stability and cost-effective service. Features Direct OEM replacement for 360 mm front rotors Dimpled & slotted rotor surface improves bite and pad cleaning 2-piece floating rotor design reduces unsprung weight High-carbon iron rings with reusable aluminum hats 48 curved vanes for outstanding cooling Manufactured and assembled in Bellingham, WA A1-308DS Girodisc Mercedes 360mm Front Rotors FAQs: Are these a direct fit? Yes, they bolt to factory hubs and work with OEM calipers. Do they work with OEM pads? Yes, and they are compatible with performance pad compounds. Can I replace just the rings later? Yes, reuse the hats with D1-308DS replacement rings. Why dimpled & slotted instead of drilled? The pattern improves bite and gas evacuation while minimizing cracking risk versus fully drilled rotors.

Girodisc Audi with Brembo 18Z Front Rotors These Girodisc A1-309 two-piece front rotors are purpose-built for Audi models using the Brembo “18Z” 6-piston caliper (Cayenne/Q7/Touareg sourced). They bolt to the car and work with 18Z calipers while reducing unsprung weight and improving cooling versus one-piece rotors. Vehicle Fitment Audi S4 (B5) – Front, with Brembo 18Z caliper conversion Audi A6 (C5) 2.7T – Front, with Brembo 18Z caliper conversion Audi Allroad (C5) 2.7T – Front, with Brembo 18Z caliper conversion Fitment note: Minor clearancing on the bottom of the upright is required on C5 chassis per Girodisc instructions. Will not fit C5 A6 4.2 V8, RS6, or Allroad 4.2 V8. Lightweight, High-Flow Design High-carbon iron rings with curved internal vanes act as a centrifugal pump to draw cooling air through the disc. Reusable 6061-T6 aluminum hats and cadmium-plated drive pins control thermal growth while keeping street noise in check. Features Direct fit for 18Z caliper swaps on B5 S4 / C5 2.7T (A6, Allroad) Two-piece floating construction reduces unsprung weight High-carbon rings, curved vanes for efficient cooling Reusable aluminum hats; new hardware included Manufactured and assembled in Bellingham, WA Sold/priced per pair A1-309 FAQs Will these fit C5 4.2 V8 or RS6? No. These are for B5 S4 and C5 2.7T cars only when running 18Z calipers. Is any modification needed? On C5 chassis, Girodisc specifies minor upright clearancing; a guide/video is provided. Do I need different brake lines or brackets? No additional lines or brackets are required for standard 18Z swap geometry. What rings do I use later? Use D1-309 front replacement rings. Related Products D1-309 Girodisc Audi with Brembo 18Z Front Replacement Rings

A1-310 Girodisc Mercedes A45, CLA45, GLA45 Front Rotors The Girodisc A1-310 two-piece front rotors are a direct, bolt-on upgrade for the AMG 45 platform. They retain factory calipers and brake bias while reducing unsprung weight and improving heat management compared to one-piece OE discs. Vehicle Fitment Mercedes-AMG A45 (W176) – Front Mercedes-AMG CLA45 (C117) – Front Mercedes-AMG GLA45 (X156) – Front Lightweight, High-Flow Design The curved-vane iron rings act as a centrifugal pump to pull air through the disc, while the reusable 6061-T6 aluminum hats and floating hardware maintain quiet street manners and race-ready thermal expansion control. Features Direct OE replacement; no modifications required 2-piece floating construction with reusable aluminum hats High-carbon iron rings with curved internal vanes for cooling Cadmium-plated high-strength drive pins with Belleville springs Manufactured and assembled in Bellingham, WA Sold/priced per pair A1-310 FAQs Will these work with factory pads? Yes — they’re compatible with OE and performance pad compounds. Any noise from the floating hardware? Spring washers pre-load the pins to prevent rattles during street use. Do I need new lines or brackets? No, these mount to stock hubs and calipers with OE hardware. What rings replace these later? Use D1-310 front replacement rings. Related Products A2-044 Girodisc Mercedes A45, CLA45, GLA45 Rear Rotors D1-310 Girodisc Mercedes A45, CLA45, GLA45 Front Replacement Rings D2-044 Girodisc Mercedes A45, CLA45, GLA45 Rear Replacement Rings

A1-311 Girodisc Audi B9 S4, S5, SQ5 Front Rotors These Girodisc A1-311 two-piece front rotors are a direct, bolt-on replacement for the B9 S4, S5, and SQ5. The fully floating design sheds unsprung weight and improves cooling versus OE one-piece rotors while retaining factory calipers, ABS, and brake bias. Vehicle Fitment Audi S4 (B9) – Front Audi S5 (B9) – Front Audi SQ5 (B9) – Front High-Carbon Rings, Curved Vanes Proprietary high-carbon iron rings use curved internal vanes to draw cooling air through the disc. Reusable 6061-T6 aluminum hats and cadmium-plated drive pins control thermal growth and maintain quiet street manners. Features Direct OE replacement; no mods required Two-piece floating design reduces unsprung weight High-carbon iron rings with curved vane cooling Reusable aluminum hats; new hardware included Manufactured and assembled in Bellingham, WA A1-311 FAQs Pad compatibility? Works with OE or performance pad compounds. Bed-in needed? Yes—perform a standard bedding procedure after install. Front ring part number? D1-311 front replacement rings. Related Products D1-311 Girodisc Audi B9 S4, S5, SQ5 Front Replacement Rings A2-130 Girodisc Audi B8/B9 Rear Rotors D2-130 Girodisc Audi 330mm Rear Replacement Rings

Girodisc Cadillac CT4-V Blackwing Front Rotors These Girodisc A1-318 2-piece front rotors are a direct bolt-on for the Cadillac CT4-V Blackwing. The fully floating assemblies reduce unsprung weight and improve thermal management while retaining OEM calipers, ABS logic, and brake bias. Vehicle Fitment Cadillac CT4-V Blackwing – Front High-Carbon Rings with Curved Vanes Proprietary high-carbon iron rings use curved internal vanes to draw cooling air through the disc. Reusable 6061-T6 aluminum hats and cadmium-plated high-strength drive pins control thermal growth and deliver quiet street manners with race-ready float. A1-318 Girodisc Cadillac CT4-V Blackwing Front Rotors Features Direct OE replacement; no modifications required 2-piece floating design reduces unsprung/rotational mass Curved vane internal geometry for strong airflow and cooling Reusable aluminum hats; hardware engineered for quiet operation Manufactured and assembled in Bellingham, WA Sold/priced per pair A1-318 Girodisc Cadillac CT4-V Blackwing Front Rotors FAQs Do these change pedal feel or ABS? No — rotor geometry preserves factory brake balance and ABS calibration. Which replacement rings match the A1-318? Use D1-066 380×34 mm front replacement rings. Are OEM pads compatible? Yes — works with OEM and performance pad compounds; follow pad manufacturer bedding. Track suitability? Yes — high-carbon metallurgy and floating hardware are designed for repeated high-heat cycles. Related Products D1-066 Girodisc 380×34 Front Replacement Rings A2-318 Girodisc Cadillac CT4-V Blackwing Rear Rotors D2-318 Girodisc Cadillac CT4-V Blackwing Rear Replacement Rings

A1-319 Girodisc Corvette C8 Z06 Front Brake Rotors The Girodisc A1-319 2-piece front rotors are a direct replacement for the factory front rotors on the Corvette C8 Z06 equipped with standard iron brakes (non-Z07 package). These fully floating, 2-piece assemblies reduce unsprung weight and rotating mass, improving both braking performance and handling response. Vehicle Fitment 2023+ Chevrolet Corvette C8 Z06 (without Z07 carbon ceramic brake package) Direct replacement for OEM front iron rotors Race-Bred Cooling & Construction The rotor rings are machined from proprietary high-carbon iron for durability and heat resistance. Seventy-two curved internal vanes act as a centrifugal pump, drawing air through the hub to keep brake temperatures in check during hard use. The 2-piece floating design uses a lightweight 6061-T6 aluminum hat, allowing easy replacement of the rings (D1-147) when needed. Features Direct replacement for factory iron front rotors 2-piece floating rotor assemblies reduce unsprung weight 72 curved vane design for superior cooling High-carbon iron rings with reusable aluminum hats Manufactured and assembled in Bellingham, WA Minimum recommended ring thickness: 32 mm A1-319 Girodisc Corvette C8 Z06 Front Brake Rotors FAQs: Will these fit cars with the Z07 package? No. These rotors are for Z06 models with standard iron brakes, not the Z07 carbon-ceramic option. Do these work with OEM calipers? Yes. They bolt directly to the factory hubs and calipers with no modifications. Do I need special pads? No. These are compatible with OEM and performance street or track pads. What’s the service life? Replace rings at or below 32 mm thickness or if cracks propagate to the edge under inspection. Are they directional? Yes. Each rotor is side-specific with directional curved vanes for optimal airflow. Related Products A2-319 Girodisc Corvette C8 Z06 Rear Brake Rotors D1-147 Girodisc Front Replacement Rings D2-319 Girodisc Corvette C8 Z06 Rear Replacement Rings

A1-320 Girodisc Corvette C8 Z06, E-Ray Front Iron Rotor Conversion These Girodisc A1-320 2-piece front iron rotors are a direct bolt-on conversion for the Corvette C8 Z06 and E-Ray. They reduce unsprung weight and improve thermal performance while retaining street-friendly operation and full compatibility with factory calipers. Vehicle Fitment Chevrolet Corvette C8 Z06 (Front) Chevrolet Corvette C8 E-Ray (Front) High-Performance Two-Piece Design High-carbon iron rings are mated to reusable aluminum hats. The 48 curved vane internal design pulls cooling air through the rotor for consistent performance under repeated heavy braking. When the rings wear out, replace them with D1-320 to refresh your setup without buying complete rotors again. Features Direct bolt-on conversion for C8 Z06 and E-Ray (front) 2-piece floating rotor design reduces unsprung weight High-carbon iron rings for superior thermal stability 48 curved vanes for efficient cooling Reusable aluminum hats with black anodized finish Manufactured and assembled in Bellingham, WA A1-320 Girodisc Corvette C8 Z06, E-Ray Front Iron Rotor Conversion FAQs: Does this kit work with OEM calipers? Yes, it bolts on and works with factory calipers and lines. Can I replace just the rings later? Yes, use D1-320 398 mm front replacement rings. Is this suitable for track use? Yes, it is engineered for high heat loads and repeated braking cycles. Does it change ABS or brake bias? No, rotor dimensions are designed to maintain OEM system behavior. Related Products A1-320 Girodisc Corvette C8 Z06, E-Ray Front Iron Rotor Conversion A2-319 Girodisc Corvette C8 Z06, E-Ray Rear Rotors D1-320 Girodisc Corvette C8 398mm Front Replacement Rings D2-319 Girodisc Corvette C8 Z06, E-Ray Rear Replacement Rings

A1-322 Girodisc BMW G8X M3, M4 Front Iron Rotor Conversion Price: $1,450.00 These Girodisc A1-322 2-piece rotors directly replace the 400 mm carbon-ceramic (CCB) front rotors on the BMW G8X M3 & M4. The fully floating design reuses the factory CCB calipers and requires no permanent modifications—just swap rotors and run the factory iron pad shape for the calipers. Vehicle Fitment BMW G80/G81 M3 with CCB – Front BMW G82/G83 M4 with CCB – Front 400 mm Iron, Built to Run Cool High-carbon iron rings with curved internal vanes pull cooling air through the disc for stable performance under repeated hard stops. Reusable 6061-T6 aluminum hats and cadmium-plated hardware control thermal growth and keep noise down in street use. Features Direct CCB-to-iron conversion; no coding or bracket changes 2-piece floating construction reduces unsprung/rotational mass Curved-vane rings for strong airflow and heat rejection Reusable aluminum hats; new hardware included Manufactured and assembled in Bellingham, WA Sold/priced per pair A1-322 FAQs Do I change calipers? No. These rotors are designed to run with the OEM CCB calipers. Which pads do I use? Use the factory iron pad shape for the G8X CCB calipers (not the carbon-ceramic pads). Any coding needed? No — critical dimensions match CCB spec, so ABS/DSC calibration remains correct. Wheel clearance vs. CCB? Rotor envelope matches the 400 mm CCB setup, so wheel clearance is unchanged. Front replacement ring part number? D1-220 400 mm front rings. Related Products D1-220 Girodisc BMW F8X/G8X 400mm Front Replacement Rings A2-322 Girodisc BMW G8X M3, M4 Rear Iron Rotor Conversion D2-322 Girodisc BMW G8X Iron Conversion Rear Replacement Rings