Zipp 454 NSW Clincher Disc Brake Rear Wheel 2018 Review

• Zipp 454 NSW Clincher Disc Brake Rear WheelThe Zipp 454 NSW Clincher Disc åÊBrake Rear Wheel offers cyclists the greatest aerodynamic balance, cross-wind åÊstability and the immense stopping power of disc brakes. This wheel also åÊfeatures the new Zipp Cognition hub, which provides the greatest levels of åÊrolling efficiency as the driver disengages when not pedalling, then uses åÊmagnets to pull it back into engagement when the slightest pedal rotation is åÊmade Speed, Control and ConsistencyZipp engineers studied what made things move fast in nature, what caused their efficiency to be so successful and how nature solved similar problems such as speed, control, and consistency. Zipp took inspiration from the humpback whales fast and smooth movements thanks to the special features on the leading edge of its pectoral fins and the unique micro-texture of a shark‰Ûªs skin surface, which gives it the ability to glide effortlessly through the water and experience minimal drag. These features are the key to the success of the 454 NSW wheels, only Zipp has fine-tuned the rim surface to provide this same exceptional level of efficiency as an aerodynamic property opposed to natures effectiveness underwater Features: åÊHub Model:åÊCognition Disc Rear åÊHub Width (O.L.D ): 135/142mm åÊBrake Standard:åÊDisc Brake specific åÊRim:åÊClincher åÊRim Internal Width: 17mm åÊRim Depth:åÊ53/58mm åÊSpokes:åÊSapim CX-Ray J-Bend åÊSpoke Hole Count:åÊ24 Hole åÊSpoke Pattern:åÊ2-cross åÊSpoke Length Drive Side:åÊ248mm åÊSpoke Length Non-Drive Side:åÊ254mm åÊMax Tyre Pressure:åÊ125psi / 8.62bars åÊDimpled Surface:åÊABLC HexFin åÊNipples:åÊSapim Secure-Lock åÊThru Axle Compatible: Yes åÊWeight:åÊ850gFeatures: 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 53/58mm 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. 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‰Ûªs profile to further reduce high yaw drag and improve crosswind stability. 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 Buy Zipp Wheels & Tyres from Chain Reaction Cycles, the World‰Ûªs Largest Online Bike Store.
• Product codes: 00.1918.351.001
• Product ID 1: 21374620986
• Product ID 2: 608993UK

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