The 45mm deep 303 NSW is no ‘race day only’ wheelset, it’s built to take the abuse of everyday training rides, Gran Fondos, and wandering adventures. Zipp has achieved this reliability at a lighter weight with a revised carbon fibre layup developed through testing on the famed cobbles of the Arenberg Forest with the world’s fastest riders. The 303 NSW Tubeless features a 19mm internal rim width and corresponding outer rim shape for aerodynamic optimization with 25mm tyres. 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. Additional Features: Updated Zipp graphics and cosmetic identity that scream speed. Applied using Zipp’s ImPress™ direct-print technology Versatile 45mm rim profile for increased speed and better cornering, control and comfort Tubeless design provides secure performance when ridden at lower tyre pressures Cognition hub features Axial Clutch™ technology to allow the freehub’s ratcheting mechanism to deliver half the mechanical drag of conventional three-pawl hubs Showstopper™ textured brake track delivers the best modulation and shortest stopping distances in wet and dry conditions Ships with QR end caps, quick release skewers Campagnolo driver body sold separately Lifetime Warranty Zipp wheels, handlebars, stems, and seatposts come with a lifetime warranty for product issues while riding. The lifetime warranty is not transferrable. Proof of purchase is required. Technologies: Impress We’ve employed Zipp’s ImPress graphics technology, which prints graphics directly on the wheel, to help allow the dimples to do what they were designed to do – help control vortex shedding, the rate at which air sheds off the wheel. Managing this is crucial to stability. ImPress graphics also give 303 NSW a distinctive stealthy look. Axial Clutch With Cognition’s Axial Clutch technology, we’ve reduced this drag by disengaging the ratchet mechanism when coasting. With less internal hub drag a rider can pedal less when drafting in a headwind, achieve higher speeds when coasting in an aero tuck, or opt to stop pedalling a moment sooner before entering a corner and bank that wattage for use exiting the corner. Axial Clutch technology also allows riders to maintain speed through corners that don’t require braking input, thereby increasing corner exit speeds. Inside the Axial Clutch mechanism, Zipp uses magnets, rather than steel springs, to move and engage the lightweight Metal Injection Molded (MIM) ratchet rings for unmatched reliability and consistent operation. With 36 points of engagement that all interlock simultaneously, there isn’t a more secure freehub mechanism on the market. Aerobalance Zipp’s sole mission is to help you go faster. That’s why its wheels are race-ready before they’re camera-ready. For years, Zipp has used a combination of testing methods – wind tunnel, CFD computer simulations, pro athlete evaluations, on-road testing, and the RollingRoad ride simulator – to refine aero performance to new levels of excellence. Over the decades of innovation, Zipp’s engineers have learned to look beyond just focusing on simply reducing aero drag. Instead, the goal now is to reduce aero drag while also minimizing the effects of crosswinds on handling. This optimizing of aero efficiency and crosswind stability became known internally at Zipp as AeroBalance. The approach began with Firecrest technology and has been advanced with the introduction of the NSW lineup, especially with the Sawtooth technology found in the 454 and 858 NSW. Sawtooth accomplishes this with a series of patented fin-shaped Hyperfoil nodes along the inner diameter of the rim that work together with SRAM’s new HexFin ABLC dimples for improved airflow. Showstopper Zipp’s industry-leading silicon carbide Showstopper brake track continues to evolve and improve, providing unmatched stopping power and modulation regardless of weather conditions or the length of the descent. ABLC Sawtooth Zipp’s Sawtooth dimple design consists of 12 nodes that are specifically clocked to start aerodynamic shearing at a rate of 50hz at a rider speed of 20mph. Sawtooth accomplishes this by inducing small sheet vortices that shed at a low magnitude, but at a higher natural frequency, thus decreasing the laminar bubble effect on the aerodynamically shielded side of the rim’s profile to further reduce high yaw drag and improve crosswind stability. Cognition Hubset With the Cognition hubset’s Axial Clutch technology, Zipp has reduced this drag by disengaging the ratchet mechanism when coasting. So you can approach corners at higher speeds, and ultimately, save time. A star-flanged straight-pull hubshell design on the rear hub distributes the load placed on the hub flange away from the bearings. Zipp has also developed a unique scalloped edge hubshell design for its front hub. This scalloped design maintains the bearing bore diameter when high radial spoke tension is applied. That means you get bearings that quietly stay in place, roll faster, last longer and provide a laterally stiffer hub. XDR The XDR driver body is a universal mounting system for 11 and 12-speed cassettes that incorporate cogs with fewer than 11 teeth. It allows for lighter and more versatile drivetrains without requiring new rear axle standards, cassette tools or hub redesigns. The XDR interface is 1.85mm longer than XD and is designed for road hub applications. XDR driver bodies are compatible with all XD cassettes when the cassette is installed with a 1.85mm spacer.
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