Quarq DUB Crank Arm Assembly - 175mm 8-Bolt Direct Mount DUB Spindle Interface Natural Carbon D2Quarq DUB Crank Arm Assembly 175mm 8 Bolt Direct Mount DUB Spindle Interface Natural Carbon D2. 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