GIRODISC A2-220SL Rear Left Brake Rotor for BMW M2 (F87) / M3 (F80) / M4 (F82 / F83) 2014-2020

Iron rotors replace the factory carbon ceramic rotors with no modifications necessary. Strongly suggest changing the pads at the same time to a material designed to work with iron rotors.

The central hat section of rotor is made from strictly U.S. sourced 6061-T6 aircraft specification aluminum.  The disc is made from own proprietary cast iron, poured in the USA and machined from start to finish in house at Girodisc.  The rotor utilizes a curved vane design, developed in racing to act as a centrifugal pump to force cooling air through the disc.

The rotor and hat have a floating mount system, which utilizes 12 high strength alloy steel drive pins, manufactured by Girodisc in the USA to own specifications and cadmium plated for a long lasting corrosion resistance. These pins take the load from braking actions while maintaining the axial and radial float between the hat and disc. The pins are secured by class 12.9 cap screws with hardened washers. In order to keep the rotors from making noise when cold, the pins are mounted with anti-noise spring washers on the rotor side which allow the rotor to grow with heat expansion but eliminate the rattle and noise associated with floating rotors. This float also allows the rotor to self center between the pads.

Applications

• F8X M3, M4 including CS with optional carbon ceramic brake package (gold calipers)
• F87 M2, M2 Competition & M2 CS with red or silver calipers
• F87 M2 CS with optional carbon ceramic brake package (gold calipers)

If your vehicle has blue calipers, they require a different size of rotor.