The Alcon rear 4‑piston 355x28mm race brake kit for BMW F8X is specified as a rear race assembly with nickel plating and clear rotor dimensions. The source links this rear race kit to F8X models and provides piston count and rotor size so buyers understand the application and hardware sizing for competition rear brake installations on that BMW platform.
Alcon BMW F8X 4 Piston 355x28mm Rear Race Kit - Nickle Plated