Zipp 454 NSW Carbon Clincher Wheelset – Shimano

Zipp 454 NSW Carbon Clincher Road WheelsetThis Zipp 454 wheelset is an evolution in the world of competitive road wheels. Sporting a rim design that has been loaded with the latest in Zipp’s racing technological advances, the added aerodynamic finesse and drag reduction leads to exceptional rider stability and a more efficient power transfer to the road. Wind-tunnel tested, these wheels are built to handle strong crosswinds with ease, transferring more power output from the rider to the road than any other wheelset on the market.Exceptional Ratchet EfficiencyAt the heart of these 454 NSW wheels is Zipp’s Cognition hubset which comfortably rides the cutting edge in hub design. Whereas a conventional hub effectively functions as a drum brake once the rider stops pedalling and begins to coast, the Cognition hubs disengage the ratchets via powerful internal magnets, effectively putting the bike in neutral gear. The moment you rotate the pedals forward, the ratchet re-engages and applies your power instantly.Features: Material: Rim: Carbon; Hub: Alloy Rim Model: X454NSW Rim Depth: 53/58mm Rim Inner Width: 17mm Rim External Width: 26.4mm Rim Surface: ABLC HexFin Technology Spokes: Sapim CX-Ray Spoke Count: 24 Spoke Lacing: 2-cross Max Tyre Pressure: 125 psi Hub: Cognition Speed: 11-Speed Weight: 835gTechnology: 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 an 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. 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 has introduced a moulded-in groove specifically tuned for the Zipp Tangente Platinum Pro EVO Brake Pad. The grooves have been optimized to interact with the 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: Zipp’s 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. 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 rim’s 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.