Scope S4.a Cl Disc Tubeless Road Wheel Set. SCOPE Pair of S4 wheels, AllRoad Disc .All-Road | Outstanding All-Rounder.SPECIFICATIONS:-Sport Series versus Race Series What are the differences between Sport and Race Series wheels? About technologies The Race Series features our latest technologies, including our Diamond ratchet hub set, and wider AEA-optimized rims (28/30 mm - external width).The Sport series incorporates the proven technologies of the previous generation of Scope wheels, with hubs featuring our 3-pawl system.For the S4.A wheelset, the rim is 30 mm wide and tubeless-ready.Both series use the Scope tubeless system and Local Reinforcement carbon structure.About spokes The Race series uses our top-of-the-range Sapim CX-Ray / Sprint Aero spokes.The Sport series is built with Sapim CX Leader Aero spokes.Sport versus Race In a nutshell, Race Series wheels are lighter thanks to the lighter hub system and spokes.In addition, Race Series wheels offer better aerodynamic performance and rolling resistance thanks to the wider AEA-shaped rims.Like the Race Series, Sport Series wheels are handcrafted to the same high quality standards.Like all Scope wheels, Sport Series are developed in the Netherlands, with the aim of achieving the perfect balance between aerodynamics, rigidity and durability. tradeinn Bikeinn