CenterLine X rotors are the lighter weight version of SRAM's quiet, smooth, and robust CenterLine rotors. The CenterLine X rotor features a two-piece design with an alloy center and steel brake track. Rounded edges make for easier wheel installs and are UCI-compliant. FEATURES: Lightweight, two-piece design Rounded edges are UCI-compliant and allow for easier wheel installs Compatible with both road and mountain bike brakes SPECS: Hub interface: Center Lock Bolt material (RT): n/a Diam (Rotor): 180mm Rotor Type: Centerline Color (RT): n/a Rec Lockring: SRAM Lockring included