Road Tube Type top of the line tire. Combines flexibility, speed and control at the highest level. The best road bike tire Schwalbe has ever developed.With the latest Flex carcass and high-tech V-Guard underlay, this Pro One is the benchmark in Tube Type tires.For riders who prefer to ride with tubes, but still want the best ride characteristics and "flex".Using the new ADDIX Race Compound is a promise of maximum speed and control in all conditions.*The Tube Type tire is specifically designed for tube use and cannot be mounted tubeless.