GRX STI LEVERS
GRX shifting comes courtesy of dedicated gravel-specific ergonomic levers (Di2: ST-RX815 or Mechanical: ST-RX810/RX600/ RX400, ST-RX810-LA) featuring an 18mm higher axis point, curved brake lever profile and anti-slip textured finish which can be gripped with assurance over rough terrain.
To integrate the use of dropper posts in gravel riding, SHIMANO created the GRX mechanical ST-RX810-LA left hydraulic disc brake lever, that when used with a 1x11 drivetrain, can control a dropper post whilst also keeping the cockpit tidy. The integrated cable pulling system has a 9mm lever throw to operate dropper posts with cable heads at the shift lever. SHIMANO GRX also includes 1x11-specific RX800 and Rx600-series left side hydraulic disc brake levers with no dropper or shift internals, including the 1x11 Di2 left-hand lever (ST-RX15), which comes with three buttons (two side buttons and a hood top button) for operating ancillary functions such as lights or 3rd party computers.