Shimano GRX, with its gravel specific ergonomics, optimized gearing options, rugged reliability, and quiet and stable drivetrain, sets itself apart from the rest of the component world. GRX hydraulic disc brake 12-speed Di2 STI's give you control, modulation and power with minimal effort in all riding conditions. Higher brake lever axis and curved brake lever, improves grip and confidence on choppy surfaces and descents. Raised hood head prevents hand misalignment and slippage. Recessed finger notch prevents upward slipping.