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,Features:The hollowtech ii 11-speed single chainset offers optimum gearing for mixed terrains and riding stylesDesigned to work with hollowtech ii type bottom bracket cupsCompatible with 11-speed hg chainsAnodized aluminium crank armsLightweight aluminium chainring4 arm, 110 mm bolt circle diameterWeight: 743 g (40t) for 170 mm