Zipp 858 NSW Carbon Clincher Rear Wheel QR. With the advancement in rider performance seen with the Zipp 454 wheelset design, Zipp have pushed the evolution of aero wheels into the deeper section category and the result is the 858 NSW Carbon Clincher. With this wheel design Zipp have proven that aerodynamic efficiency and crosswind stability are not only possible with either a shallow rim design or a deep section category, but both can be achieved in the same wheel design Performance Enhancing. Aerodynamic, Crosswind Stability. The 858 NSW, with its Sawtooth 7782mm rim profile achieves exceptional, market leading aerodynamic performance while retaining superb crosswind stability, of which would generally only be found on wheels that use a much shallower rim profile. This wheel design pushes the boundaries of what is possible from a deep section wheel and does it with performance enhancing elegance The Greatest Rolling Efficiency Available. This wheel features the Cognition hub, which provides the greatest rolling efficiency on the market. The hub driver disengages completely when not pedalling, and when you begin to pedal, the driver uses magnets and a unique design to pull the driver back into engagement instantly; this engagement occurs with the slightest forward rotation of the pedals, transferring power from the rider to the road instantaneously Features Rim Material Carbon Rim Width Internal 17mm Rim Width Outer 23 7mm Rim Depth 7782mm Type Clincher Max Tyre Pressure 125 psi Dimple Surface ABLC HexFin Technology Brake Interface Rim Brake Spoke Count 24 Spoke Type Sapim CX Ray Straight pull Spoke Lacing Pattern 2 cross Nipples Sapim Secure Lock Bearing Type Cartridge Hub Model Cognition Hub Spacing O.L.D 130mm Freehub 10, 11 Speed Weight 942gTechnologies Showstopper Showstopper is a complimenting pairing of a directional, moulded in, texture with silicon carbide particles suspended in the surface resin. The current media blast process applied to all Zipp rims increases the surface roughness of the brake track providing the rider with consistent and responsive braking. In order to improve this for the wettest of rides, Zipp have introduced a moulded in groove specifically tuned for the Zipp Tangente Platinum Pro EVO Brake Pad. The grooves have been optimized to interact with leading edge relative to the rotation of the wheel of the brake pad and the four cooling channels. The leading edge of the pad and first two channels efficiently wipe water and debris outward, cleaning and drying the braking surface, while the second two cooling channels have maximum interference with the grooves allowing greater braking force than a smooth rim. The cleaning effects of the groove and pad interaction improve brake feel and consistency even in dry conditions. ImPress Zipps ImPress graphics technology prints graphics directly on the wheel, which allows the dimples to do what they were designed to achieve, to control vortex shedding and the rate at which air sheds off the wheel. Managing this is crucial to stability. ImPress graphics also give NSW a distinctive stealthy look. Cognition The ultimate in Zipp hub technology. Every time a conventional hub set starts to coast, friction within the freehub ratchet mechanism works like a drum brake to slow the rider down. The drag between hub shell and driver body during coasting is considered as efficiency loss, especially for road wheels. High drag also can significantly contribute to chain dropping issues. The drag torque drives the cassette clockwise so the chain gets loose on the load side. The solution The rear Cognition hub with AxialClutch technology reduces drag by disengaging the ratchet mechanism when coasting. It then uses magnets to re engage once the rider starts pedalling. SawTooth The name given to the Zipp NSW variable depth 5358mm rim profile. This design is the result of rigorous wind tunnel and real world testing. The rim shape takes natures elegant design solutions and combines their precise engineering finesse to deliver a wheel that performs like nothing else before. Hyperfoil This technological design refers to the individual nodes that are part of the Sawtooth rim design. Each of these structures feature the Hexfin ABLC dimples that stabilises handling in gusting and strong wind conditions by increasing wind vortex shedding. The dimples create a secondary vortex around the outer rim surface, which in turn heightens the wheel control and saves rider energy from being wasted. Hexfin Aerodynamic Boundary Layer Control ABLC The 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 rims profile to further reduce high yaw drag and improve crosswind stability Buy Zipp Wheels & Tyres from Chain Reaction Cycles, the World's Largest Online Bike Store.
