The R1 Concepts Geo-Carbon drilled-and-slotted rotor for the rear left of 2004–2010 BMW 645Ci applications is a replacement rotor with drilled holes and slots to assist heat evacuation and pad surface cleaning under braking. Specified for the 645Ci rear left position, it’s intended for use when replacing worn rear rotors as part of scheduled brake service on those BMW models.
R1 04-10 BMW 645Ci Rear Left Drilled & Slotted Geo-Carbon Rotor