GIRODISC A1-282SL Front Left Brake Rotor for BMW M2 (G87) / M3 (G80) / M4 (G82 / G83) 2021-

These GiroDisc 2-piece rotors are a direct replacement for the front rotors on the BMW M2 (G87) / M3 (G80) / M4 (G82 / G83) without carbon ceramic brakes. 2-piece, fully floating assemblies help shed unsprung weight and rotating mass from the front axle of the vehicle.

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 when they need to be replaced.

All major components including the hats, rotor rings, and drive pins are manufactured in-house at facility in Bellingham. 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 recommend replacing these rings is 34mm. Also recommend replacing them if a crack leads to the edge of the ring.