Zipp 858 NSW Carbon Clincher Disc Wheelset

. Based on Zipp's high performance 454 NSW wheelset, this 858 NSW carbon clincher wheelset benefits from an optimised and refined deep rim design and spoke pattern to deliver the highest level of road rolling quality available Deep, Lightweight Rims. The specialised design of these stunning carbon road wheels allows them to minimise air drag, while their 77mm rim depth allows them to cut sharply through the air for a remarkably high speed threshold. Each wheel features a drag reducing Cognition Disc hub, enhanced rolling performance and disc brake compatibility, making for a superbly versatile, lightweight and responsive set of rollers that are perfect for serious and leisurely road runners alike Features Hub ModelCognition Disc Rim Outer Width23 7mm Rim Internal Width17mm RimCarbon Clincher Rim Depth77mm SpokesSapim CX Ray J Bend Spoke Hole Count24 Hole Spoke Pattern2 cross Spoke Length Non Drive226mm Spoke Length Drive232mm Max Tyre Pressure125 psi Dimpled SurfaceABLC Hexfin NipplesSapim Secure Lock Weight905g front, 984g rearTechnology SawToothThe 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. HyperfoilThis technological design refers to the individual nodes that are part of the Sawtooth rim design. Each of these structures features the Hexfin ABLC dimples that stabilise 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 ABLCThe 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 BuyZipp Wheels & Tyresfrom Chain Reaction Cycles, the World's Largest Online Bike Store.