Running the older 11-speed GRX Di2 setup means you're on the wired system that predates the wireless RX825 group, and finding replacement or spare parts for it gets harder every season. The Shimano GRX ST-RX815 dual control lever is the direct answer if you need to replace a damaged lever, complete a project bike, or build up a second wheelset-and-frame combo without switching to 12-speed. Each side ships pre-bled and paired with the BR-RX810 flat mount caliper, so you're getting a complete side of the system rather than sourcing lever and caliper separately.

The lever body carries GRX-specific ergonomics that separate it from the road Ultegra Di2 platform sharing its shift internals. The hood head sits raised to keep your hands from sliding forward under braking or over impacts, a recessed finger notch prevents upward creep, and the entire hood surface uses textured rubber. The brake lever itself carries an anti-slip coating, and the rotational axis is positioned 18mm higher than the road equivalent, which combines with SERVOWAVE geometry to give you a lighter initial pull with progressive power as you squeeze deeper into the stroke.

Two E-Tube ports on each lever connect into the wired Di2 architecture — this system does not work with the newer semi-wireless 12-speed components, so plan your build around the wired battery, junction, and EW-SD50 wiring standard. Each lever carries three buttons: two side shift buttons plus a hood-top button that can be programmed through E-Tube Project software to run compatible head units, lights, or serve as a lap trigger. Synchronized and Semi-Synchronized shift modes coordinate the front and rear derailleurs automatically once configured.... Read More