When disc brake technology started to appear on road wheels, it was natural for us to develop a compatible wheel based on our iconic Ksyrium Pro SL. But disc brakes also throw up a unique set of challenges, so it was a huge benefit to fall back on our experience designing mountain bike disc wheels. The end result is this do-it-all wheel that excels on most rides: flat or hilly, training or racing.
The braking load is higher on the front wheel since the center of gravity is transferred to the front of the wheel when the bike is decelerating. Thus, the front wheel needs to be overbuilt with more spokes (20 instead of 18) and those spokes need to be crossed on each side of the wheel to make sure the brake torque will be efficiently and evenly distributed
The lower part of the rim also undergoes higher stress than a rim brake wheel. This stress is about the equivalent of the pedalling torque so what the rear rim can withstand in traction, it can also stand when braking. The front rim however, needs to be redesigned and gets the same dimension as the rear rim, also benefitting from asymmetrical design as the disc creates asymmetry in the wheel dish.
To make sure all this extra stopping power reaches the ground, Ksyrium Pro Disc comes with our Yksion Pro tyres in 25mm. They offer a supple 127 TPI casing, Kevlar beads, a well-balanced rubber compound that offers the best blend of grip and rolling resistance and a weight of only 190g in 23mm and 205g in 25mm.
The front wheel is compatible with the three existing retention systems and can be easily converted from quick release, to 12mm or 15mm through axles using the adapters provided. The rear wheel is quick release compatible only. As for rotor mount, both wheels exist in International 6 Bolts and Center Lock