Get the precision of Shimano Di2 electronic shifting and reliable hydraulic disc braking in a single gravel-optimised control — the GRX ST-RX815-L pairs a 2x11-speed electronic shift lever with the BR-RX810 rear hydraulic disc caliper for confident, fatigue-free control on any terrain.

Highlights

• GRX Di2 electronic shifting — 2x11-speed, light and instantaneous actuation
• Paired with BR-RX810 rear hydraulic disc brake caliper (flat mount)
• Raised brake pivot axis (18 mm higher than road levers) for better leverage on long descents
• Tooled reach adjust — set lever distance to suit any hand size
• Textured, anti-slip hood and lever surface for control on rough gravel
• Shimano ICE Technologies heat dissipation on the BR-RX810 caliper
• Two E-Tube ports for flexible Di2 wiring during installation
• 1000 mm mineral oil brake hose included

Gravel-Engineered Ergonomics

The ST-RX815-L hood geometry is purpose-built for mixed-terrain riding. A raised ergonomic profile prevents hand misalignment on bumpy surfaces, while a recessed finger notch stops the hand sliding upward under hard braking. The textured anti-slip coating works in wet and muddy conditions where smooth hoods lose grip. The brake pivot axis sits 18 mm higher than on Shimano's road levers, giving greater mechanical advantage so you can modulate speed on long, steep gravel descents without hand fatigue.

Di2 Electronic Precision

As part of the GRX Di2 system, the ST-RX815-L delivers crisp, instant gear changes at the push of a button. Two E-Tube ports allow flexibility when routing the wiring harness through your cockpit. The system is compatible with Shimano's D-FLY wireless unit, enabling system status checks and button-function customisation via the E-TUBE PROJECT app.

BR-RX810 Rear Hydraulic Caliper

The bundled BR-RX810 rear caliper uses a two-piston design with resin pads and mineral oil hydraulic fluid for consistent, fade-resistant braking. Flat mount architecture keeps the caliper low-profile and integrates cleanly with modern gravel frame designs. Shimano ICE Technologies help manage heat on extended descents, maintaining consistent pad bite regardless of conditions.

Compatibility & Fit

Designed for 2x11-speed GRX Di2 and Shimano Road Di2 electronic groupsets. Brake caliper is flat mount, compatible with 140 mm and 160 mm rotors (rear). Brake fluid: Shimano mineral oil. Brake hose: SM-BH90-JK-SSR or SM-BH90-J-SSR (straight joint). Suitable for drop-bar gravel and adventure bikes running Di2 electronic shifting.