Sram: The SRAM CenterLine XR (CLX-R) rotor works in tandem with the SRAM eTap AXS™ drivetrain. It's designed specifically for road riding - and to keep braking quiet at every stop.THINGS TO REMEMBERStreamlined form optimized for road useCenterLine track offers quiet brake operationTwo-piece design reduces weight SPECIFICATIONSDiam (Rotor): 140mm, 160mmHub interface: Center LockBolt material (RT): n/aColor (RT): n/aRotor Type: Centerline 2-Piece