The Brembo TY3 Sport disc rotor is a direct-fit rear replacement for the 2011 BMW 1 Series, sized 300×20 mm. It matches the rear diameter and thickness required for correct fitment and includes a slotted braking face as the sport-oriented rotor surface. This rotor is offered as a direct replacement to maintain the listed rear dimensions for that model year.
Brembo 2011 BMW 1 Series Rear TY3 Sport Disc Rotor - 300X20