SHIMANO AlfineFC-S501 Black Crankset 170mm 8-Speed BSA Bottom Bracket
SM-BB4600 2-piece Crankset with Chain Guard
Single or double chainguard integrated design
Outer Ring Material Aluminum
Threaded Bb Shell Width 68
Crank Arm Finish Anodized/Painted
Compatible Bb Type Outboard
Gear Arms5
Compatible ChainSuper narrow HG 9-speed/HG 8-speed
Crank Arm Material Aluminum
Compatible with 68mm or 70mm BB shell only
42.7mm chain line
Bolt Circle Diameter: 130mm
Original Shimano parts guarantee that all components work perfectly for optimum performance and maximum safety and longevity.