Developed and tested using Turbulent Aero technology, the 42/49 is designed for everything you do, providing all-day capability with aerodynamic sensibilities. Raced at events as varied as the Paris-Roubaix and the Giro D'Italia, the 42/49 wheels have a lifetime warranty supported by a no-fault crash replacement. And in keeping with Reserve workmanlike ways, you'll find external nipples, standard spokes, no tire limitations with a semi-hooked design and no rider weight limits. Wind tunnel tested using Computational Fluid Dynamics (CFD), with the goal of maximizing aerodynamics while enhancing stability Optimized carbon fiber rim construction allows Reserve to define the exact fiber orientation for each rim model, to maximize stiffness and strength without sacrificing weight Built with DT Swiss Hubs Specifications Rear Axle12mm Thru x 142mmRim Width (Internal)25.4Rim Width (Internal)24.8Cassette Body TypeShimano HG 11/12-Speed RoadFront Axle12mm Thru x 100mmValvePrestaColorCarbonWheel Size700cDefined ColorBlackISO Diameter622 / Road / 29"Tire TypeTubeless ReadyRim MaterialCarbonHub/Brake CompatibilityCenter-Lock Disc