Shimano SLX FC-M7100-1 Crankset - 175mm 12-Speed 1x Direct Mount Hollowtech II Spindle Interface BLKShimano SLX FC M7100 1 Crankset 175mm 12 Speed 1x Direct Mount Hollowtech II Spindle Interface Black. The Shimano SLX FC M7100 crankset for MTB offers the simplicity of a 1x drivetrain with the stability and compatibility of Hollowtech II technology. Chainring sold separately Hollow forged crank maximizes power transfer while limiting weight Shimanos Hollowtech II technology provides the best balance of stiffness strength weight and rotating