Shimano GRX RT-CL800 S Disc Brake Rotor with Lockring - 140mm CenterLock Silver. The Shimano RT-CL800 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

1.5mm thickness

Includes lock ring with internal serration