Schwalbe set out to construct the lightest weight and fastest rolling clincher tire available. They achieved this task with the Ultremo ZLX. We weight them in 168 grams. Fantastic tire by any measure, but is best suited for clean roads, swept crit courses or for the rider who will sacrifice some durability for added weight savings.
The ZLX is essentially a ZX tire with some weigh shedding measures. The gram savings is accomplished by removing the protective band underneath the tread. This not only reduces the weight but also decreases friction and makes the tire roll faster and grip better while cornering. All of the other features of the tire are similar to the standard ZX tire.
Schwalbe's proven Race Star Triple Compound has higher density tread in the center for rolling fast and softer density rubber on each side of the center tread for increased grip.
The Ultremo tire is available in black only in a 23mm width.