SHIMANO M151 170mm 28-38 -48 w/chainguard BB Shell Width: Square TaperChain Compatibility: 3/32"Chainring BCD: RivetedmmChainrings: 28/38/48T/GuardCrank Color: Black/SilverCrank/FD Type: Mountain TripleCrankarm Length: 170mmCrankarm Length: 170mmCrankset BCD: RivetedCrnk Clr: black/silverPedal Spindle: 9/16"Rings: 28-38-48Spin: Not ApplicableSpindle Interface Type: Square Taper JISSpindle Length: 122mm