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: 6-boltBolt material (RT): SteelColor (RT): n/aRotor Type Centerline: 2-Piece