Zipp 858 NSW Carbon Wheelset 2025 Zipp’s 858 NSW Carbon Wheelset 2025 is the ultimate aero weapon for riders who demand speed above all. Now lighter and more efficient than ever, it is powered by Zipp’s Total System Efficiency technology to help conquer the four key obstacles to speed: wind resistance, gravity, rolling resistance and vibration. With a sleek hookless rim design, the 858 NSW delivers a flawless transition between tyre and rim, improving aerodynamics and cutting weight. Its 82mm to 85mm deep Sawtooth rim profile is Zipp’s most aerodynamic and stable, giving triathletes, time trialists and all-out speed seekers the confidence to go faster in all conditions. The 23mm internal width is perfect for wider tyres run at lower pressures, offering lower rolling resistance and a smoother ride that keeps the rider fresher. While optimised for tubeless setups, the wheelset also supports tubeless-ready tyres with tubes for added flexibility. For peak performance, a 28mm tyre is recommended. With reliable disc braking and the lightweight ZR1 SL hubset featuring ceramic bearings and 66 points of engagement, the 858 NSW offers the total package for riders chasing every marginal gain.