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 ---The HollowTech II 11-speed single chainset offers optimum gearing for mixed terrains and riding styles ---Designed to work with HollowTech II type bottom bracket cups (not included) ---Compatible with 11-speed HG chains ---Anodized aluminium crank arms ---Lightweight aluminium chainrings ---4 arm, 110 mm bolt circle diameter ---172.5mm 40T 11 speed.
