Zipp 303 Carbon Tubular Road Wheels - XDR

. Built for speed and endurance, this Zipp 303 tubular wheelset is the perfect choice for any rider looking to have the edge on race day. Featuring an exceptionally lightweight and responsive carbon fibre construction, both 45mm deep rims have been repeatedly tested to offer an excellent aerodynamic profile. Each rim surface also features Zipp's dimpled ABLC texturing, proven to reduce air drag and improve heat transfer for less wear on your brakes Fully Optimised Hubset. This wheel comes with Zipp's 77177 hubset, which pairs with the included Sapim CX Sprint spokes for stable performance and an excellent power transfer, giving you more power for each pedal rotation Features Hub Model77177 Rim Outer Width26 5mm RimCarbon Tubular Rim Depth45mm SpokesSapim CX Sprint Spoke Hole Count24 Hole Spoke Pattern2 cross Spoke Length Non Drive272mm Spoke Length Drive270mm Max Tyre Pressure125 psi Track AdaptableNo Freehub CompatibilitySRAM XDR Dimpled SurfaceABLC Sawtooth NipplesSapim, Secure Lock Weight593g front, 746g rearTechnology Visco Elastic Constrained Layer Control VCLCUsing 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 an impact from the road, a lot of the shock is absorbed by the VCLC system, resulting in a 10% reduction in road vibration. Carbon BridgeAdding Kevlar, stitched into a 6 bundle co axial thread and placing this at the rim edge allows Zipp to capstone the top of each outside diameter bridge, providing an improved way to distribute impact forces. This gives from 28% to as much as 50% improvements in impact depending on the rim type and allows Zipp to increase the lateral stiffness with a minimal weight penalty. 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. FirecrestA 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 BuyZipp Wheels & Tyresfrom Chain Reaction Cycles, the World's Largest Online Bike Store.