The Shimano RT-CL800 disc brake rotor provides quiet and consistent braking control for any terrain. FEATURES: Consistent braking performance on any long, steep descent thanks to excellent heat dissipation Robust arm shape for quiet operation without sacrificing weight or heat dissipation 1.5mm thickness Includes lock ring with internal serration SPECS: Rotor Type: Two Piece Hub/Disc Compatibility: Center-Lock Disc Pad Compatibility: All Pad Compounds