In the world of tires, much like the world of bed sheets, higher thread count means higher quality. At 320 tpi, the Vittoria Corsa Evo SC is at the top of the heap. Higher thread count means quicker response, better grip, and reduce rolling resistance. The Corsa is made with two different rubber compounds harder in the middle to reduce rolling resistance and softer at the edges for better grip. Inside the tire, Vittoria uses PRB 2. 0 puncture resistant high density Aramid belting, which is lightweight and puncture resistant.