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. Streamlined form optimized for road use CenterLine track offers quiet brake operation Two-piece design reduces weight SPECIFICATIONSDiam Rotor: 140mm 160mmHub interface: Center LockRotor Type: Centerline 2-Piece