SRAM CRANK ONLY QUARQ DUB ASSEMBLYQUARQ DUB CRANKARM ASSEMBLY Stronger, stiffer, and lighter than ever; that is exactly what you can expect with the Quarq DUB crank arm assembly. Paired with the DZero or DFour DUB power meter spider and the DUB bottom bracket, the Quarq DUB crank arms assembly builds a power meter that can handle the toughest of conditions. FEATURES: Only compatible with Quarq DZero DUB and DFour DUB power meter spiders. Does require a SRAM DUB bottom bracket.