Tyre Size Guide
Each tyre contains a code and at first glance it may be confusing for motorists. To help you understand what the coding means, we've provided an explanation.
A tyre size is made up of several parts and is considered in millimetres. Th width, the profile (percentage of the width), the diameter of the inner rim, and the load and speed ratings. Below is a typical example for how this is written and what the numbers all mean:
Example: 225/45 17R 91Y
The width (A) is 225mm
The profile is 45% (B = 101mm)
The diameter (C) is 17 the R stands for radial. If there's no letter then it is a cross ply tyre
The 91 is the load rating and the Y is the speed rating
Tyre Speed Rating
The speed rating is the maximum speed for the tyre. The table below displays what each letter represents:
If you have any further questions about tyre sizes or would like to book a mobile tyre fitting, please get in touch with us on 0800 810 0972.