Shimano CUES FC-U8000-1 Crankset Superior Chain Retention The crankset keeps your wheels moving. Attach your pedals and start moving with the Shimano CUES FC-U8000-1 Crankset. The CUES crankset has superior chain retention and a stiff yet lightweight design that boosts confidence on long trekking trips. This Hollowtech II hollow-forged crank maximizes power transfer while limiting weight. Dynamic Chain Engagement+ special gear tip shape improves chain engagement and retention for smooth riding over rough terrain. This crank is compatible with frames with 68/73mm bottom bracket shells and requires an outboard bottom bracket. Features Hollowtech II hollow-forged crank maximizes power transfer while limiting weight Dynamic Chain Engagement+ special gear tip shape improves chain engagement and retention for smooth riding over rough terrain Designed for frames with 68/73mm bottom bracket shells Outboard bottom bracket required SPECIFICATIONSSpeeds9/10/11-Speed BB Compatibility68/73mm (BB-MT801 or BB-MT800-PA bottom bracket recommended)Chain Ring40T, 42TCrank Arm Length170mm BB Spindle Interface-Chainring Material Steel Bolt Center Diameter (BCD)96mm Shimano Asymmetric Crank Arm Material Aluminum Chainline50mm Bottom Bracket Included No Intended Use Mountain, Gravel Weight N/A | Shimano | Cues Fc-U8000-1 Crankset 170Mm 9/10/11-Speed 40T | Aluminum