The Shimano RT-CL900 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 Heat dissipation paint boosts performance Includes lock ring with internal serration SPECS: Rotor Type: Two Piece Disc Compatibility: Center-Lock Pad Compatibility: All Pad Compounds