Gravel riding puts your hands through punishment that road cycling cannot match. Washboard surfaces rattle your grip loose, unexpected impacts jar your fingers off the hoods, and long hours on rough terrain fatigue your forearms faster than pavement ever could. Shimano designed the GRX ST-RX815 Di2 lever specifically around these challenges, reshaping the hood and lever geometry to keep you in control when conditions get rough. This set pairs those purpose-built levers with BR-RX810 flat mount hydraulic disc brake calipers, pre-bled and ready to install.

The hood shape distinguishes GRX from road levers immediately. A raised hood head prevents your hands from sliding forward during braking or when you hit an unexpected bump. A recessed finger notch keeps your grip from creeping upward. The entire hood surface uses textured rubber for additional traction, and the brake lever itself has an anti-slip coating. These details add up to a cockpit that stays secure when the terrain tries to shake you loose.

Di2 electronic shifting eliminates cables from the equation, replacing them with button-activated motor control. The shift buttons require minimal travel and provide distinct clicks between upshift and downshift so you know exactly what gear you selected without looking down. Three programmable buttons on each lever let you customize your cockpit. The two side buttons handle standard shift duties, while a third button on the hood top can control compatible lights, cycle computers, or serve as a lap button. E-Tube Project software lets you reassign any function to any button and adjust shift speed to your preference.... Read More