Sidewall Markings
On the sidewall of a tyre you will find various codes and
markings. The list below aims to simplify the coding system
and allow you, the user, to understand the valuable information
imprinted on the sidewall.
To know more about Speed ratings
and Load indices click on the
link provided.
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 |
| T |
Speed Rating |
Tyre Age
Tyres carry a three digit age code on the sidewall indicating
the month and year of manufacture. For example 129 means the
tyre was manufactured in December 1999.
Other Markings
M&S - Identifies Mud and Snow tyres
DOT Codes - Coding satisfying the requirements of
the US Department of Transportation contain a mixture of letters
and numbers such as DOT DVDE MTA 129. These identify the place
of manufacture.
E-Marks - Tyres for sale in the European Community
must carry an E -Mark in accordance with ECE Reg 30 - eg E4
027550.
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