Shimano Altus FC-M311 Crankset FEATURES: Hyperdrive SG-X chainrings Chainguard integrated design Chainguard model 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: 22/32/42t Spindle Interface Type: Square Taper JIS Drivetrain Speeds: 7 , 8 Chainring BCD: Riveted BB Included: No