How to check your tyre size

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Finding your tyre size

Identifying your tyre size is quick and easy. You can find this information on the sidewall of your tyre, as shown in the image.

This information lists the size and specification of your tyre, as well as ensuring it complies with European safety standards.

What each code section stands for:

This code is a breakdown of four key factors when determining tyre size and type:

Width - The width of the tyre in millimetres.

Profile - The height of the tyre sidewall as a percentage of the tyre width.

Rim Size - The diameter of the tyres inner rim, in inches.

Speed Rating - The maximum recommended speed for the tyre at full load.

For example, a tyre with the code 205 / 55 R16 79T would have a tyre width of 205 millimetres, a sidewall height of 55% of the width, a 16 inch inner rim size and a speed rating of T.

We have made buying tyres online with Formula One Autocentres as straightforward as possible - our vehicle registration tyre search facility automatically identifies the manufacturer's standard tyre size for your vehicle.

Always check your existing tyres

If searching for your tyres online at Formula One Autocentres using your vehicle registration number and your existing tyre size differs from the one displayed in the tyre results, simply update the relevant tyre size details and search again.

Important note: Some manufacturers specify different front and rear tyre sizes. Please check the size of tyre you want to replace before ordering.

How to check tyre tread

Most tyres have a tread wear indicator located on the inner groove of the tread. It is important to check the whole tyre meets this minimum marker, as any part of the tyre tread that does not meet this marker may result in your tyre being illegal.

Legal Requirements

Current UK Legislations require a minimum tyre tread of 1.6mm by law. The penalty for breaching this is a fine of up to £2500 and 3 penalty points per tyre. Formula One Autocentres recommend checking your tyres on a weekly basis to ensure tyre pressure and tread meet legal requirements, as well as checking for any damage - as this also can result in your tyre being deemed illegal. If you have any concerns that your tyre(s) may be illegal please call your local Formula One Autocentre - we will be happy to take a look at them for you, free of charge.

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