A: Officially, the speed rating of the tyre carrier indicate the maximum speed prescribed load under specified conditions. Letters A to Z on behalf of the tyres from 4.8 km / h to 300 km / h speed rating certification. Common speed rating are:

Q 160 km / h V 240 km / h

R 170 km / h W 270 km / h

S 180 km / h Y 300 km / h

T 190 km / h Z ZR speeds above 240 km / h

H 210 km / h ZR if instructions marked tyre specifications appear ZR. Such as P275 / 40ZR17 93W, then the maximum speed rating ("93W" in the "W") of 270 km / h.

In recent standardized tyre identification made provision, in addition to infinitely variable Z speed rating outside of all grades of operating instructions are included speed symbols and load factor. For example: P225 / 60R15 95H are instructions for use of the tyre, the tyre showed a maximum load capacity of 690 kg, the maximum speed rating of 210km / h.