We designed the SDV66 series (Super Deep-V) wheel with the single focus of making it lighter, quicker and faster than any performance wheel on the market. Safe to say, we succeeded. Designed with Reynolds proprietary advanced layup technology, the SDV66 T boasts a 66mm rim depth and a symmetrical air foil shape, recognized by the National Advisory Committee for Aeronautics (NACA) as having among the very lowest drag coefficients. This unique design permits a shorter spoke length for greater aerodynamic benefit and a smoother ride than other deep section wheels. Or, as they say in engineer-speak, SDV66 delivers the optimal balance of rim depth for ride quality, stiffness and performance. Amen to that.