The open triathlon evo 700c foldable road tyre from vittoria is the open clincher version of the triathlon evo tyre it is a handmade open tubular adapted specially for ironman events it uses a aramid folding bead along with a 320tpi corespun casing and uses an isogrip compound in tire centre for maximum grip just like the triathlon evo this tyre also uses the pbr 20 breaker strip gives excellent puncture protection against sharp objects available in 700 x 22 only