Tubeless Easy High-End Time Trial and Triathlon Tire. Uncompromisingly for competition. With the latest Souplesse Carcass construction that integrates Tubeless Easy technology in the most progressive way, the Pro One TT is the benchmark for tubeless time trial tires. Winner of the IRONMAN HAWAII 2018. TT stands for speed, lowest rolling resistance and minimum weight. The riding characteristic is nevertheless inimitably good. Pro One TT has Souplesse. With the new, powerful ADDIX Race compound, the rider has full control and safety on the track in every situation, in all conditions. Schwalbe Pro One TT. Creating Souplesse.