No.9 50d rims are designed to a be a lightweight and stable starting point to building exquisite wheels, featuring a wide inner width that pairs well with a range of tubular tire sizes. They offer an aerodynamic advantage over the 30d rims, creating a stiffer, more robust platform. Fit for long days in the saddle, cutting through the wind and hammering finish line sprints, they’re a perfect all-rounder. These are excellent option for track racing use as well as for use on the CX course. These disc brake-specific rims show up in style, with a clean design and aesthetics. For use with tubular tires only.