Vittoria Open Corsa Evo-CX Clincher Tire The new generation of racing tire. ï New tread pattern for even better performance: - Diamond tread pattern elongated in the direction of rotation for better ground contact. - Curved side ribbing for excellent flex-free grip even in the wet. ï New KevlarÆ SiO 2 3D compound with added silica, for reduced rolling resistance and better grip in the wet. ï New composite Corespun K 290 TPI casing, with mixed Polycotton (cotton and polyester) and KevlarÆ threads. High thread density of 290 TPI (equivalent to over 1,100 threads per decimetre!) ensures maximum comfort even at high inflation pressures. Added KevlarÆ means even better cut resistance.