The triathlon evo 28 inch tubular road tyre from vittoria is a handmade tubular tyre with a butyl innertube it is a triathlon ready tyre with a 320tpi slick tubular for ironman racing the butyl inner tube stay is designed to stay fully inflated while the bike is parked overnight in a transition area and it features a low drag 22mm section that is built for intense speed available in black in 28 x 22mm