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How to read your tyre size

Tyres are one the most important components on your vehicle as they are the only part of the car which is in touch with the ground.

When buying new tyres for your vehicle, it’s imperative to ensure that you buy the correct size as fitting the wrong size tyre can affect the handling and safety of your car.

We don’t suggest that you just rely on the tyres already fitted on the car as if you have a pre owned vehicle the previous driver may have chosen to fit a different tyre size that you may not be aware of.

We would recommend looking in a few different places to find the correct tyre size:

  • On the door sill inside your vehicle
  • In the petrol cap of the vehicle
  • In the Owner’s manual of the vehicle
  • Your local tyre fitter should also be able to confirm the size tyres required for your car.

Once you know what the correct size of your tyres should be, you’ll then want to understand a little more about what the markings mean which are displayed on the sidewall of the tyre

A typical tyre size looks like this

205 –Is the width of the tyre in millimetres
55 – relates to the height of the tyre sidewall as a percentage of the width. In this case 55%., it’s also known as the aspect ratio.
R equates to the construction of the tyre which is Radial construction
 – is the diameter of the tyre's inner rim in inches
91 – is the Load Rating of the Tyre which indicates the maximum load weight the tyre can run on
V – is the Speed Rating and this indicates the maximum speed for the tyre when at full load, in this case 149 miles per hour

You’ll also see the name of the brand who manufactured the tyre

We hope that you’ve found this information helpful but if you need any further assistance, please do get in touch with one of our friendly tyre experts.

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