Continental grand prix gt road bike tyre one for the grand tours if you like the reliability of gatorskins but also want theperformance of a gp4000s blackchili compound then this could be the tyre for you ideally suited to sportive riders the secret is in the design an extra wide polyx breaker protects against thorns glass andother sharp objects whilst a continuous 3 ply casing gives 50more sidewall thickness without adding much weight these features earn the endorsment gt grand tour ea