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Know Your Tyre Size

tyre_guide

Finding the size of tyres

Tyre Sizes

On your tyres sidewall you will find various codes and markings. Amongst these you will find the size.

Tyre sizes are made up of a number of different numbers and letters. For example tyre size 185/65 R 14 82 T is made up of the following information:

Value Description
185 The tyre section width in millimetres
65 The aspect ratio in %
R Denotes the tyre’s construction type – in this case it’s a radial
14 Rim diameter in inches
82 Load Index
T Speed Rating

Speed Ratings

The speed symbol is on all tyres. Here is a comprehensive list of all the different speed types and their values:

Speed symbol Maximum speed km/h mph
N 140 87
P 150 93
Q 160 99
R 170 106
S 180 112
T 190 118
H 210 130
V 240 149
W 270 168
Y 300 186
ZR 240 149

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