Shimano GRX ST-RX815 11-Speed Di2 Shifter and Caliper

The Shimano GRX ST-RX815 Di2 Shift/Brake Lever with BR-RX810 Flat Mount Caliper is a purpose-built gravel control system designed to deliver precise electronic shifting and powerful hydraulic braking in demanding mixed-terrain conditions. As part of Shimano’s dedicated GRX platform, it brings together refined ergonomics, durable construction, and consistent performance for riders who regularly transition between pavement, gravel, and rough backcountry surfaces.

At its core, the ST-RX815 lever prioritizes control and confidence. The hood body features an anti-slip textured surface and coated finish that enhance grip security in wet, dusty, or high-vibration environments. A raised hood shape supports a more natural hand position for long hours in the saddle, while a recessed finger notch helps prevent upward hand movement during aggressive braking or technical descents. These ergonomic refinements work together to improve stability and reduce fatigue over extended gravel rides.

The integrated Di2 electronic shifting system delivers fast, accurate, and effortless gear changes at the press of a button. By removing mechanical cable tension from the equation, it ensures consistent shifting performance regardless of terrain, rider load, or environmental conditions. This level of precision is especially valuable on steep climbs, fast gravel sections, and unpredictable mixed-surface riding where reliability matters most.

Braking is handled by the BR-RX810 flat mount hydraulic caliper, engineered to provide strong, predictable stopping power with excellent modulation. Shimano ICE Technologies help manage heat buildup during prolonged braking, improving consistency on long descents and technical terrain. The result is stable braking performance that remains reliable even under sustained load or in challenging weather conditions.

Additional ergonomic improvements include a higher brake lever pivot point and tool-free reach adjustment, allowing riders to fine-tune lever positioning for comfort and control. This adaptability makes the system suitable for a wide range of hand sizes and riding preferences, supporting both aggressive gravel racers and long-distance endurance riders.

Overall, this system is designed to deliver a balanced blend of precision, comfort, and durability, giving riders the confidence to push deeper into variable terrain without compromise.

The Shimano GRX ST-RX815 Di2 Shift/Brake Lever with BR-RX810 Flat Mount Caliper is a gravel-specific electronic shifting and hydraulic braking system designed for precise control, refined ergonomics, and dependable performance across mixed terrain.