Optimized for single-chainring drivetrains, the SHIMANO GRX BL-RX820-L brake lever delivers greater comfort and control for mixed-terrain riding thanks to SHIMANO's category-leading hydraulic disc brakes and a host of gravel-specific design features. The GRX BR-RX820 disc brake caliper brings a new level of control to gravel cycling with enhanced modulation and a quicker initial braking point. And despite its smaller construction, the system is quieter and easier to maintain.