Shimano saint m825 cranksetsaint hollowtech ii cranks are hollow forged duraluminum creating a lighter weight crankset with an axle that is 250 stronger than trail options and an arm that is double strength the single only setup looks great with custom aluminum hardware a steel pedal insert adds durability at the pedal interface please note external hollowtech ii bottom bracket is included features gravity riding has progressed with bikes being lighter and trails getting faster saint has