Sram: The SRAM CenterLine XR (CLX-R) rotor works in tandem with the SRAM eTap AXS drivetrain. Its 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-bolt, Center LockBolt material (RT): n/a, SteelColor (RT): n/aRotor TypeCenterline: 2-Piece