Sugino 75 Track 170mm/49 tooth BB Shell Width: Square TaperChain Compatibility: 1/2" x 1/8"Chainring BCD: 144mmChainrings: 49TCrank Color: SilverCrank/FD Type: Single RingCrankarm Length: 170mmCrankarm Length: 170mmCrankset BCD: 144mmCrnk Clr: silverPedal Spindle: 9/16"Rings: 49Spin: Not ApplicableSpindle Interface Type: Square Taper ISOSpindle Length: 109mmWeight: 672g