1-speed, without bottom bracket, grey 11-/10-speed compatible, carbon crank arms, X-Sync chainring made of aluminium, chainline 45.5 mm, weight: 542 g (BB30, 172.5 mm, 42 teeth), bolt circle 110 mm for 42 teeth and 50 teeth, bolt circle 130 mm for 52 teeth Number of chainrings 1 Type Item main colour grey Large chainring 42 T. Crank length 172.50 mm System compatibility 10-speed, 11-speed Bottom bracket GXP Variation Crankset