Shimano GRX ST-RX815Disc BrakeThe Shimano GRX ST-RX815 Brake/Shifter delivers light and responsive electronic shifting for mixed-terrain riding. The shifter features an ergonomic design that improves comfort and a textured brake lever that increases control on bumpy roads or trails.With the new GRX line from Shimano, you get smooth, quick, and intuitive shifting along with lever reach adjustment to perfectly dial in your ride. The Di2 system offers the digital precision of Shimano electronic shifting and synchronized shifting.Shifter FeaturesRaised hood head prevents hand misalignment and slippageRecessed finger notch prevents upward slippingAnti-slip texture and brake lever coatingImproved braking input performanceHigher brake lever axis and curved brake leverImproved grip and confidence on choppy surfaces and descentsHigher braking efficiency reduces fatigue on long ridesCaliper FeaturesExcellent heat dissipationFlat mount and anti-mud specificationConvenient tool accessSimple wheel replacementEasy and clean bleeding systemNever hesitate to tackle rough surfacesSimple set up and maintenanceSpecificationsWeight: 373g / pair of shifters onlyBrake caliper: BR-RX810Front shifter speeds (left):2Rear shifter speeds (right): 11 | Shimano GRX ST-RX815 Disc Brake Front, Left, 2 Speed