TYRE SIDE-WALL MARKINGS

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Tyre Sizes


Tyre sizes are made up of a number of different numbers and letters.

 For example tyre size 175/70 R 13 82 T is made up of the following information:

175.... The tyre section width in millimetres (That is the width of the tyre tread)
70 .....The aspect ratio in % (the height of the sidewall divided by the tyre's width)
R....... Denotes the tyre's construction type - in this case it's a radial
13..... Rim diameter in inches
82 .....Load Index (see below)
T...... Speed Rating (see below)

LOAD RATINGS

The number indicates the load index, or the maximum weight each tyre was designed to carry




Speed Ratings

All tyres carry a speed symbol in the form of a letter indicating the maximum speed for which the tyre is intended. The table below shows which speed goes with each letter.

For example: An H represents that the tire has a maximum service speed of 130 mph.