2016 Mavic Ksyrium Elite 25 Front Wheel and Tire System Black Lower rolling resistance - For the same tyre pressure the rolling resistance is reduced by 13% Greater comfort - While maintaining the same rolling resistance you can lower the tyre pressure by 20psi Improved puncture performance - A bigger gap between the road and the edge of the rim reduces the chance of a pinch flat or snake-bite All of this performance is achieved without any weight penalty, thanks to the use of our exclusive patented ISM4D technology. ISM4D leaves the exact amount of material around the spokes to maximise the balance between durability, strength and weight. The result is a wide yet super-light rim at just 405g.