Zipp 858 NSW Tubeless Disc Wheelset

The Zipp 858 NSW Tubeless Disc Wheelset is Zipp's flagship aero road wheel — a deep-section carbon wheelset built for riders whose riding centers on sustained speed over flat to rolling terrain. In Zipp's lineup, NSW designates the highest performance tier: wheels that carry proprietary aerodynamic technologies not found on standard models. The 858 NSW is specifically designed for triathletes, time trialists, and road racers who want to extract every possible advantage from their wheels. It sits at the very top of Zipp's road wheel catalog and is engineered without compromise to get there.

Zipp frames the 858 NSW's engineering around Total System Efficiency — TSE — a design framework that targets four distinct barriers to going fast on a bike: aerodynamic drag, gravity (weight), rolling resistance, and vibration-induced power loss. The insight behind TSE is that optimizing a single barrier while neglecting the others produces a wheel that wins in isolation and underperforms in real riding. A wheel tuned purely for low drag but poor vibration management bleeds watts through the drivetrain on rough pavement. A deep section that saves seconds in a headwind but adds weight gives back on every rise. The 858 NSW is designed to address all four simultaneously — each element of the rim profile, spoke count, hub specification, and tire interface chosen with system-level performance in mind rather than one isolated metric.

The aerodynamic work is visible in the rim itself. The 858 NSW uses Zipp's Sawtooth profile — an undulating depth that alternates between 82mm and 85mm around the circumference. Rather than a uniform deep section, the varying depth is designed to manage airflow behavior across the range of yaw angles a wheel encounters in actual riding: headwinds, angled crosswinds, and the constantly shifting air angles produced by turns and rolling terrain. Built into the rim are Hyperfoil nodes, raised surface features positioned at specific points to control how airflow separates from the rim at high yaw. The rim surface features HexFin ABLC dimpling — hexagonal dimples that reduce drag by managing the thin boundary layer of air immediately adjacent to the rim. Each of these is a functional engineering decision. Together they give the 858 NSW crosswind stability that most wheels at this depth don't match, and the 20-spoke lacing pattern on both front and rear keeps rotating mass and aerodynamic interference minimal.

The 858 NSW uses a hookless bead interface with a 23mm internal width and 27mm external width. The hookless design requires tubeless tires — traditional clincher tires with inner tubes are not compatible, and riders should verify that their chosen tires are certified for hookless use before purchase. Maximum inflation pressure is 73 psi, a function of the hookless bead interface. The rim is optimized for 28mm tires, where the internal width and pressure ceiling deliver the intended balance of aerodynamic integration and rolling efficiency. Running tubeless eliminates inner tube friction and vibration, contributing directly to the rolling resistance and comfort improvements that are central to Zipp's TSE claim.

The ZR1 SL hub at the center of each wheel uses ceramic bearings and provides 66 points of engagement — a gap of under 5.5 degrees between pedal input and forward wheel response. For sprint accelerations and hard efforts out of corners, that engagement rate means the connection between legs and motion is immediate and precise. The disc brake interface is Centerlock, providing a cleaner rotor mount than six-bolt alternatives and more consistent rotor centering. The wheelset ships ready to run with 12mm thru-axle end caps on both front and rear, Centerlock lockrings, and is compatible with HG11 (Shimano / SRAM 11-speed) and XDR driver bodies. Campagnolo compatibility requires a separately purchased driver body.

At $4,200, the 858 NSW is a purpose-built speed tool. It's the right wheel for triathlon and time trial racing where drag savings at sustained high speeds accumulate into meaningful time differentials. On the road, it suits flat to rolling courses where the rim depth earns its keep — riders who want maximum speed and are comfortable with the handling characteristics of a deep wheel. This is not a training wheel or a quiver choice. It's a race wheel that behaves like one, and it performs accordingly.