The Shimano GRX ST-RX810-L is the left-hand Dual Control Lever for 2x11-speed gravel drivetrains, combining hydraulic disc braking with cable-actuated front shifting in a single hood designed specifically for mixed-terrain riding. Purpose-built for gravel and adventure road cyclists who demand precise, reliable control on rough surfaces.

Highlights

• Hydraulic disc braking: Integrated master cylinder delivers powerful, fade-resistant stopping with consistent feel across all conditions.
• SERVO WAVE technology: Lever pivot positioned higher than conventional road levers — pads reach the rotor faster, leaving more lever travel for progressive braking modulation.
• Mechanical front shift actuation: Cable-operated shifting for the front derailleur keeps the system simple, robust, and easy to service on long gravel adventures.
• Gravel-optimised ergonomics: Wider hood profile and curved lever shape provide a natural, secure grip position on rough and vibrating terrain.
• Tooled reach adjustment: Lever reach is adjustable to suit different hand sizes and riding styles.
• Free stroke adjustment: Fine-tune the amount of lever travel before the brakes engage for a personalised feel.
• Anti-slip brake lever surface: Textured lever blade maintains grip confidence on loose, technical descents.
• Optislick shift cable included: Polymer-coated inner cable reduces friction for lighter, more responsive front shifting.

GRX: Gravel from the ground up

Shimano GRX is the brand's dedicated gravel groupset line — engineered specifically for mixed-terrain riding, not adapted from an existing road or MTB platform. The ST-RX810-L hood shape is wider and more ergonomic than standard road STI levers, making it easier to maintain brake control and shift confidence when standing out of the saddle on rough gravel descents. The integrated hydraulic master cylinder ensures braking performance is not compromised by cable stretch, dirt, or heat.

Compatibility & Fit

Designed for Shimano GRX 11-speed hydraulic disc drivetrains. Works with Shimano GRX FD-RX810 front derailleurs and GRX RD-RX800/RD-RX812 rear derailleurs (11-speed). Compatible with BR-RX810 hydraulic disc brake calipers. Recommended hose: SM-BH90-JK-SSR. Uses Shimano mineral oil only — do not use DOT fluid. Clamp band diameter: 23.8–24.2 mm (standard drop bar compatible). In Australian bicycle convention, the left lever controls the rear brake. Sold as a single left lever.