The ultimate aero weapon from Zipp is faster than ever, thanks to our Total System Efficiency technology. The 858 NSW Carbon Tubeless Disc Brake Wheelset with TSE features a tubeless and hookless rim profile for a seamless tire transition and significant weight reduction. The 858 offers you the advantages of our high rims at a weight typically associated with 20 mm lower rims. The internal width of the wheel is 23 mm, making it ideal for riding wider tires at lower pressures, thus reducing rolling resistance. This is how TSE technology helps you overcome the four obstacles to speed: aerodynamic drag, gravity, rolling resistance, and vibration losses. The wavy rim shape of the 858 NSW, with a height of 82 mm to 85 mm, along with our patented Sawtooth profile, represents our most powerful design for aero efficiency and crosswind stability. The 858 NSW features Zipp's Carbon Internal Reinforcement (CiR), making the rim 10% lighter while maintaining the same stability as previous models. The result is pure speed for triathlons, time trials, and aggressive road cycling. And although this wheelset is optimized for tubeless tires, you still have the option to use tubeless-compatible tires with a tube. The 858 NSW is fastest with a 28 mm tire. In triathlons, wider tubeless tires at lower pressures are faster and provide a smoother ride, allowing your body to feel fresher for the running segment. Disc brakes also offer more reliable speed control and braking power in all weather conditions. At the heart of the 858 NSW is the Cognition V2 hub set, designed with the Axial Clutch V2 mechanism for faster engagement, reduced friction, and improved durability.