Shimano Altus FC-M311 Cranksets FEATURES : Hyperdrive SG-X chainrings Chainguard integrated design SPECS : Number of Chainrings: Triple Color: Black Crank Length (mm): 170 Chainline/Hub Compatibility: 135/142 MTB Hubs Pedal Spindle: 9/16" Crank Intended Use: Mountain Rings: 22/32/42 , 42/32/22 Spindle Interface Type: Square Taper JIS Drivetrain Speeds: 7 , 8 Defined Color: Black Chainring BCD: Riveted BB Included: No