XDS X-LAB Branta Carbon Power Meter Crank Arms Dial In Your Fit. Never Compromise. The Branta Carbon Power Meter Crank Arms offer riders a performance-focused upgrade without the flagship price tag. Designed specifically for the X-LAB AD8, AD9, and RT9 platforms, these arms allow you to adjust your crank length while retaining the factory-integrated, dual-sided, spider-based power measurement. With four available lengths ranging from 162. 5mm to 172. 5mm, you can easily achieve a more efficient pedaling position tailored to professional fit recommendations. Constructed entirely from carbon fiber, the complete assembly-including the integrated 29mm spindle and weighs 320 grams. This 29mm road spindle follows the standard X-LAB carbon build specification, ensuring seamless compatibility with T47 bottom brackets. If you are currently running a Branta crank-based power meter and require a specific length not included with your stock build, this is the essential replacement component. Carbon fiber construction keeps the complete crank arm and spindle assembly at 320 grams, maintaining the weight advantage of the factory carbon build Four arm lengths (162. 5 / 167. 5 / 170 / 172. 5mm) let you follow a professional bike fit without swapping out the entire crankset Integrated 29mm road spindle is engineered for the Branta crank platform, preserving full compatibility with the factory power meter system OEM fit and finish matches the original X-LAB build quality so there are no compromises on appearance or function at the interface points | Xds | X-Lab Branta | Carbon | Power Meter Crank Arms 165Mm | Carbon | Ad8, Ad9, Rt9