SHIMANO GRX – Hydraulic Disc Sub Brake Lever The SHIMANO GRX BL-RX812 in-line brake lever bring greater rider control for mixed terrain riding thanks to SHIMANO’s category-leading hydraulic disc brakes. The hydraulic disc sub brake lever offers reliable and accessible braking in more positions and allows for quick access while riding upright on the tops of the handlebar.

• More confident and accessible braking from multiple positions
• Quickly brake when riding upright
• Less fatigue on long tours