Continental grand prix 4 season vectran bike tyrethe continental grand prix 4 season vectran bike tyre is manufactured with a duraskin anti tear fabric meaning that the grand prix 4 season vectran bike tyre holds up under extreme conditions even in the paris roubaix race the hell of the north cyclists who ride with duraskin tyres have the fewest tyre related problems during the race that is notorious for punctures versatile tyre for every seasonby utilising continentals unique carbon co