The Ksyrium Pro UST delivers top comfort and performance in a wide range of conditions, making it equally at home on fast, hilly trails as well as in the mountains. One of its key updates is the UST Tubeless compatible rim. In combination with the Yksion Pro UST tyres, roll-off efficiency, comfort and grip increase with the same tyre pressure. Mavic has also made the hub bodies lighter and equipped the rear wheel with the Instant Drive 360 freewheel with extra fast adhesion: The bearing clearance adjusts automatically - for permanent smooth running without maintenance effort. The spokes are made of the exclusive Zicral alloy and are therefore stiffer, stronger and lighter than conventional stainless steel spokes. The Isopulse lacing on the rear wheel (left crossed, right radial) provides a more balanced spoke tension and thus a stiffer, more stable wheel, while the Fore rim bores create the most stable connection between rim and spokes - with higher rigidity and extra user-friendly tubeless compatibility, since no rim tape is required. Wherever possible, material is reduced on the rim to save weight and remains where it must be stiff and stable. This ultimately results in an impressive, light system weight.