All tyres are marked with their speed capability in the form of Speed Symbol. Speed symbol is an alphabet to indicate the maximum speed at which a tyre can carry a load corresponding to its load index For example, for a Tyre with size specification “185/70R14 88S”: S is the speed symbol corresponding to 180 km/h. In other words the subject tyre is capable of doing 180 Kmph for load not exceeding its load index 88 (560 kgs).