Road cycling is evolving, so we keep innovating. The pursuit of AeroBalance defines Zipps approach to wheel design. Combining low drag performance with stable handling is our mission, because speed without control, is useless. Zipps NSW Series, since its inception in 2015, has been the launching pad for Zipps most relevant innovations. To that end, the Zipp 303 NSW Carbon Clincher features an entirely redesigned rim shape that aerodynamically integrates wider tubeless tires for enhanced ride quality and performance. The 303 NSW Carbon Clincher Tubeless features a wider 19mm internal rim width and corresponding outer rim shape for aerodynamic optimization with 25mm tires. This wheelset allows you to run tubeless or traditional clinchers. The benefits of tubeless include superior flat protection, the ability to run lower pressures, and a smoother ride with high cornering grip and low rolling resistance. SIZE (WHEELS): 700c RIM CONSTRUCTION: Carbon Hookless TIRE COMPATIBILITY: Tubeless tires only BRAKE COMPATIBILITY: Disc (Center Lock) RIM - INSIDE WIDTH: 23mm RIM FINISH: UD fiber / Bake-On labels / Matte clear coat RIM PROFILE: Symmetrical WEIGHT (G): 1530 WEIGHT BASED ON: Lightest configuration: 12mm through axles and XDR body. No tape or valve included in weight. Front: 711g Rear: 819g