LOAMLINES BUILT BY RIDERS. Continental Grand Prix 4 Season 700x28C / 28-622 – PAIR OF TYRES PAIR DEAL Product Overview Two genuine Continental Grand Prix 4 Season road bike tyres in the popular 700x28C / 28-622 size. The Grand Prix 4 Season is built for riders who want dependable road performance throughout the year, combining excellent grip and rolling performance with enhanced protection against punctures and cuts. An excellent choice for road riding, commuting, winter training, sportives, endurance riding and long-distance cycling, particularly when conditions are less than perfect. No voucher or code required.