Zipp s 454 NSW Carbon Tubeless Disc Brake is the ultimate road racing wheelset. This wheel delivers everything the performance cyclist demands. It s aerodynamically efficient and stable in all wind conditions. What s more, a wider rim is designed for tubeless tyres at lower pressure for reduced rolling resistance and vibration damping, so you ll lose as little energy as possible out on the road. This wheel is optimized for 25mm tubeless tyres for all out speed.Technology: Total System Efficiency, ImPress, Sawtooth & Axial Clutch V2Cognition hub set rolls efficiently whether you are pedalling or coasting with Axial Clutch V2 technology The 454 NSW Tubeless Disc Brake is roughly a pound (more than 400 grams) lighter than its predecessorTSE for greater efficiency and reduced rolling resistanceSawtooth rim with Hyperfoil nodes and Hex Fin ABLC dimple pattern for top aero and cross wind stability performance with an undulating 53/58mm rim depth Zipp graphics applied using Zipp s ImPress dir