Zipp 808 NSW Tubeless Disc 700c Rear Wheel

Zipp’s ultimate aero weapon is fast in the wind (thanks to its undulating rim shape) and on the ground (thanks to tubeless). You get the many aero advantages of the 858 NSW Tubeless Disc-brake wheelset with the added benefit of increased cornering grip and compliance with reduced rolling resistance of tubeless. The wheelset’s 18mm internal width is optimized for running wider tyres at reduced air pressure. The 858 NSW’s undulating rim shape, our proprietary Sawtooth™ profile, takes design cues from nature for their highest performing wheel when it comes to aero efficiency and crosswind stability. These structures inspired Zipp advanced development engineers to, for the first time, systematically apply biomimicry to solve the complex challenge of designing a wheel, with the undulating Hyperfoil™ nodes, that reduces both aerodynamic drag and side force. When it comes time to scrub off speed or stop, disc brakes will give you the confidence and stopping power you need. Simply put, the 858 NSW Tubeless Disc brake is ideal for those focused on triathlon, time trials, or aggressive road riding. The 858 NSW’s Cognition DB V2 Hubset is re-engineered with Axial Clutch V2™ for quicker engagement and lower friction Every time a conventional hubset starts to coast, friction within the freehub ratchet mechanism works like a drum brake to slow the rider down. The drag between the hub shell and driver body during coasting is considered as efficiency loss, especially for road wheels. The solution? The rear Cognition DB V2™ hub with AxialClutch V2™ technology reduces drag by disengaging the ratchet mechanism when coasting. The AxialClutch V2’s™ wave spring acts to re-engage the ratchet mechanism quickly and consistently once the rider starts pedaling. The hubset also is lightweight and durable.

Technologies

Cognition Hubset

With the Cognition hubset’s Axial Clutch technology, they've 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. they've also developed a unique scalloped edge hubshell design for their 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.

ImPress

Zipps employed their ImPress graphics technology, which prints graphics directly on the wheel, to help allow the dimples to do what they were design to do – help control vortex shedding, the rate at which air sheds off the wheel. Managing this is crucial to stability.

SawTooth

SawTooth is the name given to Zipp NSW’s patented variable depth 53/58mm rims. Developed utilizing the principles of the emerging science of biomimicry, Zipp engineers began the rigorous aero development process of SawTooth utilizing the wind tunnel, CFD, and real-world testing. The result is a rim shape that takes nature’s most elegant design solutions and combines engineering precision to deliver a wheel that performs unlike any made before. This patented new rim shape achieves something conventional aero wheels cannot; it simultaneously reduces both aerodynamic drag and side force for the ultimate in AeroBalance. Sawtooth accomplishes this with a series of patented fin-shaped Hyperfoil nodes along the inner diameter of the rim that work together with their new HexFin ABLC dimples for improved airflow. The result is Zipp’s highest performing wheelset ever realized with both aero-drag reduction and reduced side force at all wind yaw angles. This is important because higher wind yaw angles are where bike handling is most affected by the wind.

Axial Clutch

With Cognition’s Axial Clutch technology, they'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 pedaling 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 they use magnets, rather than steel springs, to move and engage their light weight 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.

XDR

The XDR driver body is a universal mounting system for 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.

Cognition Hubset

With the Cognition hubset’s Axial Clutch technology, they've 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. they've also developed a unique scalloped edge hubshell design for their 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.

Features

• A cosmetic identity that screams speed, Zipp graphics applied using Zipp’s ImPress™ direct-print technology
• Cognition DB V2 hubset rolls efficiently whether you are pedaling or coasting. Its Axial ClutchV2™ technology reduces drag and lowers friction
• 18mm internal width and tubeless compatibility for optimization of wider tyres with lower tyre pressure
• Sawtooth™ rim with Hyperfoil™ nodes and HexFin™ ABLC dimple pattern for top aero and crosswind-stability performance with an undulating 77/82mm rim depth
• Center locking rotor interface. Lockring is included
• XDR™ or SRAM/Shimano driver bodiesShips with 12mm front and rear end caps
• Campagnolo driver body sold separately
• Lifetime Warranty

Specifications

• Size: 700c
• Rim Construction: Carbon - with Hooks
• Hub: Cognition V2
• Tyre Compatiblility: Tube-type or Tubeless tyres
• Rim Depth: 82mm
• Brake Compatiblility: Disc (Center Lock)
• Driver Body Type: SRAM XDR, SRAM / Shimano Road
• Inner Rim Width: 18mm
• Max Recommended System Weight: 250lbs / 114kg
• Max Tyre Pressure: 125psi / 8.6bar
• Rim Finish: UD fiber, Impress technology
• Rim Profile: Symmetrical
• Spoke Length: 226mm, 232mm
• Weight: 1773g
• Weight Based On: Wheel set in lightest configuration: 12mm through axles and XDR body. No tape or valve included. Front: 838g Rear: 935g