The SHIMANO XTR FC-M9100-1 crank features entirely new construction using direct mount chainrings special gear tooth profile for improved chain retention and a narrow 162mm Q-factor. The FC-M9100-1 uses a 52mm chain line and can be converted between 1×12 and 2×12 with 30 32 34 36 and 38T chainrings available. On offer are 165 170 and 175mm crank arms. Special gear teeth profile designed for MTB riding usage Crankset can be used as a common component Smoother driving even over bumpy terrain Lighter and stiffer design and easily exchangeable chainring by direct mount and one key release Exchangeable of single and double chainring by direct mount Q-factor 162 mm Chainline 52 mm