Pairing the durable and smooth DUB bottom bracket platform with hollow carbon Exogram arms, the Quarq DUB crankarm assembly is light, strong and elegant. Simplified part choices, quality materials and a broader compatibility for bottom brackets and chainrings, brings power on every ride. Only compatible with Quarq DZero DUB and DFour DUB power meter spiders. Requires a DUB bottom bracket (sold separately). Not compatible with 's 3-bolt direct mount interface. Spider and chainrings sold separately. Item Specifications: BB Included: No, Chainring BCD: Direct Mount, Color: Natural Carbon, Crank Intended Use: Road, Crank Length (mm): 167.5, Defined Color: Carbon, Number of Chainrings: No Rings, No Spider Included, Pedal Spindle: 9/16", Spindle Interface Type: DUB,