Features of the Shimano Tourney FC-TY501 Crankset - 175mm Rear 6/7/8speed Ring Material: Steel Axle length of BB: D-NL Threaded BB Shell Width: 68.73 Crank Arm Finish: Painted Compatible BB Type: SquAre taper Gear Arms: 4 Compatible Chain: HG/UG|for|8/7/6-Speed