Tyre Size Explained

Tyre Size

How to Find out my Tyre Size?

Your tyre size, speed and load rating area mixture of numbers and letters similar to those below:

Tyre Size Example: 245 / 40 R20

  1. Tyre Width -  245 is the width in millimetres. For standard tyres, this number varies between 125 and 335 millimetres.
  2. Height - 40 is the height of the tyre as a percentage of the tyre width (240).
  3. R - means the tyre is a radial construction.
  4. Diameter - 20 is the diameter of the tyre.

The letter ā€˜Eā€™ should also be stamped on your tyre which means the tyre complies with European Safety Standards.

The additional part

The Additional Information

  1. Load Index '99' - is an index showing the maximum load the tyre at the speed designated by the speed symbol.
  2. Speed symbol 'W' - relates to the maximum speed at which the tyre can travel with a full load. 


Still unsure then please contact your nearest First Stop Shop from the link below who will be happy to help and advise you on your correct tyre size: