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SKU: A2-322
GiroDisc 2020+ BMW M3/M4 (G80/G82/G83 w/Carbon Ceramic Brakes) 2-Piece 380mm Slotted Rear Rotors
Replace the factory 380mm carbon ceramic rear rotors on 2021+ BMW G80 M3 sedans, G82 M4 coupes and G83 M4 convertibles with these Girodisc 2-piece slotted iron rotors. These fully floating assemblies bolt directly into place using stock carbon ceramic calipers and iron pad shape with no modifications needed. High-carbon iron rings with 72 curved vanes deliver consistent cooling during track or street use while the reusable aluminum hats reduce rotating mass.
Key Features
- 2-Piece Floating Design: Separates the high-carbon iron rotor ring from the 6061-T6 aluminum hat for reduced unsprung weight and easy ring replacement with D2-322 rings
- Advanced Cooling: 72 curved internal vanes function as a centrifugal fan to draw air through the rotor for sustained performance under repeated hard braking
- USA-Made Construction: Hats, rings and drive pins produced in-house in Bellingham WA from domestic materials with cadmium-plated steel pins and black anodized finish
- Street and Track Ready: Spring clips and Belleville washers ensure zero rattle or noise while allowing axial and radial float for even pad wear
- 380mm Slotted Surface: Precision slots clear gases and debris for shorter stopping distances and fade resistance matched to BMW G8x carbon ceramic calipers
Product Notes
- Sold as a pair with factory iron pad shape required, contact for pad recommendations
- Replace rings at 26mm minimum thickness or if cracks reach the edge
- Heavy item, secure packaging protects during transit
Installation Notes
- Professional installation recommended.
- Direct bolt-on swap, no caliper or hub changes needed
- Compatible with OEM hardware, torque to factory specs
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2021-2024 | BMW | M3 | G80 Sedan (w/ Carbon Ceramic Brakes) |
| 2021-2024 | BMW | M4 | G82 Coupe (w/ Carbon Ceramic Brakes) |
| 2022-2024 | BMW | M4 | G83 Convertible (w/ Carbon Ceramic Brakes) |
| 2022-2024 | BMW | M4 CS | G82 (w/ Carbon Ceramic Brakes) |
Why Choose GiroDisc?
- Proven in racing with direct OEM replacements for BMW performance models
- Custom high-carbon alloy withstands extreme heat cycles longer than stock
- Every component crafted and assembled in USA facility for exact fit
Frequently Asked Questions
-
Q: Will these fit my G80 M3 with carbon ceramic brakes?
A: Yes, A2-322 rotors are a direct replacement for 380mm rear CCB on 2021+ G80/G82/G83 M3/M4 models using factory calipers and iron pads -
Q: What materials are used in construction?
A: Rotor rings from proprietary high-carbon iron castings, 6061-T6 aluminum hats with black anodize, high-strength cadmium-plated steel drive pins -
Q: How do I maintain or replace parts?
A: Inspect thickness regularly, replace rings at 26mm or cracks, reuse hats with new D2-322 rings, no special tools beyond standard rotor service
Shipping & Handling
- Method: UPS Ground or FedEx
- Availability: In stock - ships same or next business day
- Packaging: Secure individual boxing per rotor, pair ships in oversized carton 24x16x8 inches
- Weight: 28 lbs per pair
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