Shimano GRX ST-RX820 dual control levers delivers light and responsive mechanical shifting for mixed-terrain riding and racing (Note: BR1060 and BR1061 are left non-shift variations for 1x set ups). The ergonomic shifter design improves comfort by decreasing pressure on your palms, while the textured, anti-slip brake lever surface increases control on bumpy terrain. The SERVO WAVE brake lever action provides greater braking power with improved control. The GRX BR-RX820 2-piston disc brake caliper brings a high level of control to gravel cycling with enhanced modulation and a quick initial braking point. Despite its smaller construction, the system is exceptionally quiet and easy to maintain.GRX ST-RX820, 12 speed shifters and flat mount BR-RX820 hydraulic calipersGRX BL-RX820-L option for brake only left 1x setupGRX BL-RX820-LA option for left side adjustable seat postMechanical shiftHydraulic disc brakeMineral oilReach adjustment range (10.9 mm)Clamp band diameter - 23.8-24.2 mmIncludes L05A resin pads with improved wear resistanceBrake hose kit (included): SM-BH90-JK-SSRRecommended disc brake rotor (not included): SM-RT/MT800