This post contains affiliate links. As an Amazon Associate I earn from qualifying purchases Sugino XD600 Tandem Crank Arm Sets. Features: Individual arms, forged 4-arm design 74/110mm, no rings Product Features BB Shell Width: Square TaperChainring BCD: 110mmChainrings: No ChainringsCrank Color: SilverCrankarm Length: 170mmCrankarm Length: 170mmCrankset BCD: 110mmCrnk Clr: silverSpin: Not ApplicableSpindle Interface Type: Square