Zipp's extra-stiff Super-9 Disc Rear Wheel is their flat disc, which is designed for maximum aerodynamics and lateral stiffness too. Its narrow profile and dimpled surfaces cheat the wind for blazing speed, the carbon construction keeps the wheel super light for excellent climbing and the flat design gets all your power to the road in your time trials and triathlons. Another key feature is laser shaping of the tire bed which ensures a perfectly glued and seated tire for even more free speed. Let the Super-9 put you on the podium!