Shimano XTR FC-M9125-1 Crankset - 170mm 12-Speed 1x Direct Mount Hollowtech II Spindle InterfaceShimano XTR FC M9125 1 Crankset 170mm 12 Speed 1x Direct Mount Hollowtech II Spindle Interface. The Shimano XTR FC M9125 crankset features a lightweight and rigid design thanks to Hollowtech II crank construction. Chainrings can be easily exchanged with the direct mount system and one key release. Single front chainring set up (chainring not included) Crank can be exchanged between single and double front chainring set ups Light and stiff desgin