Shimano Dura-Ace RT-CL900 S Disc Brake Rotor with Lockring - 160mm CenterLock Silver. The Shimano RT-CL900 disc brake rotor provides quiet and consistent braking control for any terrain.

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