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Girodisc Rear Iron Rotor Conversion for BMW G8X M3, M4

Girodisc Rear Iron Rotor Conversion for BMW G8X M3, M4

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Fitment Note: Use these rotors with the factory iron pad shape.

 

These GiroDisc 2-piece rotors are a direct replacement for the 380mm carbon ceramic rear rotors on the BMW G8X M3 & M4. Our 2-piece, fully floating assemblies utilize the factory calipers and require no modifications other than switching the rotors and pads. These rotors use the factory iron pad shape with the carbon ceramic calipers. Please contact us if you need help finding pads.

 

The rotor rings are machined from a proprietary casting made of high-carbon iron formulated to GiroDisc’s specifications. This superior metallurgy results in a rotor that holds up better, and the 72 curved vanes act as a centrifugal pump pulling air in through the hub to effectively cool the rotors under hard use. The 2-piece design means a reusable hat which can be attached to new rings (part number D2-322) when they need to be replaced.

 

All major components including the hats, rotor rings, and drive pins are manufactured in-house at our facility in Bellingham, WA from domestically sourced materials. The hat is made from 6061-T6 aluminum and coated in a black anodize finish. The drive pins are made from a high-strength steel alloy and cadmium-plated for corrosion resistance. All rotors are assembled with spring clips and Belleville washers for race-ready float while also being street-friendly with no noise from loose hardware.

 

The minimum thickness at which we recommend replacing these rings is 26mm. We also recommend replacing them if a crack leads to the edge of the ring.

 

Sold and priced per pair.

Fits

BMW M2 (G87) Coupe CS 2025-current
BMW M2 (G87) Coupe M2 2023-current
BMW M3 (G80) Sedan CS 2023-current
BMW M3 (G80) Sedan Competition 2021-current
BMW M3 (G80) Sedan Competition xDrive 2021-current
BMW M3 (G80) Sedan M3 2021-current
BMW M3 (G81) Wagon CS 2025-current
BMW M3 (G81) Wagon Competition xDrive 2022-current
BMW M4 (G82) Coupe CSL 2022-2023
BMW M4 (G82) Coupe Competition 2021-current
BMW M4 (G82) Coupe Competition xDrive 2021-current
BMW M4 (G82) Coupe M4 2021-current
BMW M4 (G83) Convertible Competition xDrive 2021-current

Manufacturer fitment

BMW G8X M2/M3/M4 With carbon ceramic - Rear

Part number

A2-322

Professional fitting is recommended.

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