Shimano XT FC-M8120-1 Crankset -165mm 12-Speed Direct Mount 55mm Chainline Hollowtech II Spindle Interface BLKShimano XT FC M8120 1 Crankset 165mm 12 Speed Direct Mount 55mm Chainline Hollowtech II Spindle Interface Black. The Shimano Deore XT FC M8120 crankset features modern construction using direct mount chainrings and a 178mm Q factor for 12 speed MTB drivetrains. Hollow forged crank maximizes power transfer while limiting weight Rigid and lightweight design for aggressive trail riding Shimanos Hollowtech II technology provides the best balance of