The R1 Concepts Geo-Carbon drilled-and-slotted rotor for the rear left of 2003–2006 BMW Z4 applications is a replacement rotor with drilled holes and slots to help evacuate heat and clear pad debris, aiding consistent pad contact. Specified for the Z4 rear left position, it’s intended for use when replacing worn rear rotors during brake maintenance on those model years.
R1 03-06 BMW Z4 Rear Left Drilled & Slotted Geo-Carbon Rotor