Zipp 404 Carbon Clincher Rear Wheel (QR) 2019

Zipp 404 Carbon Clincher Rear Wheel QR. The Zipp 404 Carbon Clincher Rear Wheel provides exceptional performance in all riding situations, conditions and events. When speed and stability are the main performance goals you seek, the 404 will certainly deliver. This wheel is at home on sprints, breakaways, hill climbs and summit finished, as well as being perfectly suited to triathlon and endurance events. Featuring a lightweight, super stiff and reliable construction while providing superior aerodynamic performance, this wheel is ready for anything Optimised Power Transfer and Stability. Although the Zipp 404 us a deep section rim, the Firecrest rim profile seamlessly carves through the air to provide optimised power transfer and stability even in strong crosswinds. The 404 design goes beyond the performance benefits provided by every other clincher wheel design in its class, enabling it to deliver the highest levels of performance and power transfer Features Hub Model 177 Rim Outer Width 25mm Rim Internal Width 16 5mm Rim Carbon Clincher Rim Depth 58mm Spokes Sapim CX Sprint Spoke Hole Count 24 Hole Spoke Pattern Non Drive 2 cross Spoke Pattern Drive 2 cross Spoke Length Non Drive 260mm Spoke Length Drive 258mm Max Tyre Pressure 125 psi 11 Speed Compatible Yes Track Adaptable No SRAM XDR Compatible Yes Dimpled Surface ABLC Sawtooth Nipples Sapim Secure Lock Weight 905gTechnologies 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. 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. Firecrest A unique to Zipp rim profile that provides more aerodynamic finesse than any other rim design. It also improves handling in crosswinds significantly and increases the ride quality enormously. Visco Elastic Constrained Layer Control VCLC Using a vibration absorbing material that is compressed between layers of solid carbon laminate on the rim surface. This technology means that when the rim received as impact from the road, a lot of the shock is absorbed by the VCLC system, resulting in a 10% reduction in road vibration. Wire EDM Electron Discharge Machining allows Zipp to precisely remove internal material from the rear hub after they have been heat treated. This removes any abnormality that can sometimes occur during the heat treating process, resulting in perfectly finished hub shell Buy Zipp Wheels & Tyres from Chain Reaction Cycles, the World's Largest Online Bike Store.