Shimano Acera Cranksets feature Shimano"s patented Hyperdrive system to provide quiet, easy and trouble-free shifting.Item SpecificationsColorBlackSpindle Interface TypeSquare Taper JISSpindle Length122mmPedal Spindle9/16"Bolt Pattern4-BoltChainring BCD104,64mmArm Length175mmRings22/32/42Crank-FD TypeMountain TripleCrank Intended UseMountainChain Compatibility9-SpeedDefined ColorBlack