Tires: Application and ID

Fig. 1:

Tire type, size, aspect ratio and speed rating are encoded in the letters and numbers imprinted on the side wall of the tire. Performance tires have a speed rating letter after the aspect ratio number. The speed rating is not always printed on the tire sidewall. These ratings are:
- Q up to 100 mph
- S up to 112 nigh
- T up to 118 mph
- U up to 124 mph
- H up to 130 mph
- V up to 149 mph
- Z more than 149 mph (consult the tire manufacturer for the specific speed rating)

An All Season type tire will have either M + S, M & S or M-S (indicating mud and snow traction) imprinted on the side wall.