QUARQ DUB CRANK ARM ASSEMBLYSLEEK AND LIGHTCarbon cranks are designed to be stiffer than aluminum cranks. This means more power from your legs will get transferred to your rear wheel. The Quarq DUB Crank Arm Assembly is sleek and compatible with Quarq DZero DUB and DFour DUB power meter spiders. These carbon cranks require a SRAM DUB bottom bracket and come in lengths from 165 to 177. 5mm. Features Carbon fiber material for a stiffer crank Compatible with Quarq DZero and DFour DUB power meter spiders Available in lengths from 165 to 177. 5mm SPECIFICATIONSSpeeds12BB Compatibility SRAM DUBChain Ring-Crank Arm Length165, 167. 5, 170, 172. 5 175, 177. 5mm BB Spindle Interface DUBChainring Material-Bolt Center Diameter (BCD)-Crank Arm Material Carbon Chainline-Bottom Bracket Included No Intended Use Road Weight N/A | Quarq | Dub Crank Arm Assembly | Carbon | 172. 5Mm, Dub, 8-Bolt Mount, D2