The R1 Concepts Geo-Carbon drilled-and-slotted rotor for 2015–2021 Subaru WRX rear left is a replacement rotor combining a Geo-Carbon surface treatment with drilled holes and slots. The rotor's surface is intended to help manage heat and clear debris for more consistent pad engagement and is supplied specifically for the rear-left wheel position listed.
R1 15-21 Subaru WRX Rear Left Drilled & Slotted Geo-Carbon Rotor