Built for a quiet and consistent braking performance the Shimano RT-CL800 Rotor is ideal for long steep descents where trusting our brakes is key. It features Ice Technologies with Freeza rotor construction to allow for a longer pad life less noise and long-lasting durability. The RT-CL800 rotor is part of the Shimano GRX 11-speed groupset and features a center lock system to allow for the easiest possible installation with a lock ring and spline mount.