Rolf Prima Ares4 ES Carbon Clincher Road WheelsetRolf Prima's Ares4 ES Carbon Clincher Road Wheelset features the aerodynamic performance of the Ares4 wheelset with some subtle differences Ares4 ES: Carbon ClincherThe Ares4 ES is a lightweight, aerodynamic wheelset. The combined weight of this carbon clincher wheelset is an impressive 1470 grams. When combined with Rolf Prima's Paired Spoke Technology for an engineering edge and their Delta Rim Technology™, this carbon wheelset neutralises pulling forces for a lighter and smoother roll with increased stability The Ares4 ES's TdF3.0 Hubs are manufactured with a wide flange placement to improve lateral stiffness and have been CNC machined to strip excess weight, making them durable and light. Throw in some CX Speed spokes, and you have a lightweight, aerodynamic, and stable set of carbon wheels Features:Material: Carbon (rim); CNC Machined Titanium (freehub)AerodynamicStrongLightweightResponsiveSuperb brakingIncludes carbon specific brake pads, rim strips, valve extenders, and QRWeight: 620g (Front); 850g (Rear)Specifications:Freehub: Shimano/SRAM/Campagnolo 10/11-speedHubset: TdF3 0Spoke Count: 16/20Spoke Type: Bladed CX SpeedRim Depth: 42mm Carbon ClincherRim Width: 27mm (maximum)Wheel Size: 700c Technologies:Paired Spoke Technology: Rolf Prima's Paired Spoke technology broke new ground when it was introduced in 1997. Bringing the spokes to the rim in pairs neutralises the left and right outward pulling forces, which allows them to build true wheels on lighter rims with fewer spokes. Fewer spokes and lighter rims help create increased aerodynamics and faster performing wheels Differential Flange Diameter™: Rolf Prima's patented oversize non-drive Differential Flange provides the leverage to transmit drive torque in the rear wheel to the non-drive spokes, thereby increasing the number of torque absorbing spokes Delta Rim Technology™: In skydiving, the Delta track is the fastest position for gaining forward airspeed. So, Rolf Prima mirrored this observation and adapted it for their Delta profile, which takes that cue using increased width and sidewall shaping to improve airflow and stability in straight on and crosswind situations. This wider rim is not just faster, but the additional tyre support improves cornering and handling in all riding conditions Buy Rolf Prima Wheels & Tyres from Chain Reaction Cycles, the World's Largest Online Bike Store.