The Shimano GRX RX610-R Shift/Brake Lever is a right-side hydraulic disc brake and rear shift control designed for Shimano’s 12-speed GRX gravel drivetrain systems, combining precise shifting with confident braking performance in a gravel-focused ergonomic design. Built specifically for mixed-surface riding, it features a textured hood shape and lever ergonomics optimized for control on rough terrain and long gravel rides. Paired with hydraulic disc braking, it delivers reliable modulation and stopping power in varied conditions, while the 12-speed rear shifting supports modern wide-range gravel drivetrains built around durability, control, and efficient cadence management across mixed terrain.