Combining the performance attributes of Mavic's UST Road Tubeless system and purpose-built disc-brake technology, this addition to the Ksyrium family is a versatile all-rounder for your most challenging road rides. The lightweight rims, engineered with Mavic's unique ISM 4D technology, are built with a wider internal and external width. They are integrated with the Yksion Pro UST tubeless tire to create a user-friendly tubeless system that makes it easy to install and remove tires. And the benefits of the Road Tubeless system are clear: lower rolling resistance and the smoother ride quality that comes with the ability to run lower tire pressure with a reduced risk of punctures. So you can ride faster, more comfortably, while expending less energy. Mavic's extensive experience designing mountain bike disc wheels informed the engineering process of these wheels. Unlike a wheel with rim brakes, braking torque is distributed through the hub, spokes and lower rim before it reaches the ground. The braking load is also higher on the front wheel since the center of gravity is transferred to the front of the bike when it’s decelerating. Thus, the front wheel needs to be overbuilt with more spokes, and those spokes need to be crossed on each side of the wheel to make sure brake torque is evenly distributed. The rear wheel also needs more spokes, but since the braking torque is generally lower, Mavic uses Isopulse lacing (radial lacing on the drive side) to maintain a better balance of the spoke tension, thus greater stability and stiffness.