The King of tubular tires. The victory list of the Corsa CX is spectacular, and folks who choose to race on tubies demand the CX more than any other tire we sell. The classic CX herringbone tread pattern provides an ideal combination of traction and low rolling resistance thanks to its Twin Tread Technology where harder tread is placed in the center of the tire where the wear occurs, and a softer compound is used on the shoulder for better grip. A thin, lightweight PRB puncture resistant belt is placed immediately beneath the tread to achieve maximum puncture protection while maintaining low rolling resistance. A Corespun K casing uses alternating Polycotton and Kevlar threads at an unbelieveable 290 TPI, giving optimal comfort at any PSI, while the Kevlar further enhances puncture resistance. Vittoria's Compressed Wrap makes use of the highest grade of Corespun casing cord and rubber compounds, resulting in a casing that allows the Polycotton and Kevlar threads to act independently, further reducing surface deflection and rolling resistance. And the tread is built with a silica enhanced Kevlar Carbon 3D SiO2 compound to give their tires longer wear life and supreme grip. 700x21. Available in tread/sidewall combinations of Black/Black and Black/Tan.