Zipp 454 NSW Clincher Disc Brake Rear Wheel 2019

Zipp 454 NSW Clincher Disc Brake Rear Wheel. The Zipp 454 NSW Clincher Disc Brake Rear Wheel offers cyclists the greatest aerodynamic balance, cross wind stability and the immense stopping power of disc brakes. This wheel also features the new Zipp Cognition hub, which provides the greatest levels of rolling efficiency as the driver disengages when not pedalling, then uses magnets to pull it back into engagement when the slightest pedal rotation is made Speed, Control and Consistency. Zipp 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 sharks 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 Hub ModelCognition Disc Rear Hub Width O.L.D 135142mm Brake StandardDisc Brake specific RimClincher Rim Internal Width 17mm Rim Depth5358mm SpokesSapim CX Ray J Bend Spoke Hole Count24 Hole Spoke Pattern2 cross Spoke Length Drive Side248mm Spoke Length Non Drive Side254mm Max Tyre Pressure125psi 8.62bars Dimpled SurfaceABLC HexFin NipplesSapim Secure Lock Thru Axle Compatible Yes Weight850gFeatures 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. 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. 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 Worlds Largest Online Bike Store.