Zipp 303 Carbon Tubular Road Wheelset

. The Zipp 303 Carbon Tubular wheelset features podium proven performance, elegance and superior stability in its excellent rim design. With an exceptionally low weight as well as an extra stiff construction, 303s are perfect for spending all day climbing the highest mountains, racing your way back down at full speed and touring across the roughest of cobbled streets. These full carbon wheels feature Zipp's unique ABLC dimpled rim surface, which significantly reduces air drag for increased speed and stability throughout the duration of your ride Wind Tunnel Enhanced Wheels. The wheel design behind each 303 Firecrest has been fine tuned and enhanced to the highest level of performance thanks to extensive wind tunnel testing, ensuring air drag does not affect stability or power output when cycling. Every Zipp wheel is laced and constructed by hand and tuned to the highest level of performance; many World Tour events have been won on Zipp wheels and customers receive the exact same quality as their Pro Race Teams Features Hub Model77 Rim Outer Width26 5mm RimCarbon Tubular Rim Depth45mm SpokesSapim CX Sprint Spoke Hole Count18 Hole Spoke PatternRadial Spoke Length260mm Max Tyre Pressure125 psi Track AdaptableNo Dimpled SurfaceABLC Sawtooth NipplesSapim, External Weight593g front, 746g rearTechnologies 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. 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.