Shimano GRX RT-CL800 S - 140mm | CenterLock

Why Do Gravel Riders Choose the Shimano GRX RT-CL800 140mm?

The Shimano GRX RT-CL800-S 140mm is the small-diameter center lock disc brake rotor designed for Shimano's gravel-specific GRX disc brake platform, built on ICE TECHNOLOGIES FREEZA construction with a redesigned rotor arm geometry engineered to minimize heat deformation. FREEZA uses a three-layer stainless-aluminum-stainless sandwich with an extended radiator fin, and the RT-CL800's new arm shape reduces the wobble and ticking noise that can occur when rotors heat up on long gravel descents -- a common complaint on road-adjacent riding where braking intervals are sustained rather than brief. The result is quieter, more consistent braking even after extended hard sections.

The CENTER LOCK spline mount design makes rotor swaps fast and hub-to-rotor alignment precise. At 140mm, this is the smallest option in the RT-CL800 lineup, appropriate for lighter riders on flatter terrain, rear-only use, or front use where frame clearance limits rotor size. Compatible with GRX hydraulic disc brake calipers including the BR-RX810 and BR-RX820, and broadly compatible with other Shimano hydraulic disc brake systems running center lock hubs. The RT-CL800-S is the correct OEM gravel rotor for riders prioritizing quiet, fade-resistant performance on all-day gravel riding.