Tyre Sizes

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It is essential to make sure that your vehicle’s tyres are safe as the consequence of having dangerous tyres is unthinkable.

Not only are there safety fears, you could be faced with points on your licence and a massive fine if your tyres are not up to scratch.

Your insurance may also be worthless if you have an accident due to unsafe tyres, because it is your responsibility to maintain them.

To know how to check your tyres, there are three things you need to look for:

  • Width – This is the first number that appears on the tyre and shows the width of your tyre in millimetres
  • Profile - This is the ratio measurement of tyre width to profile height, shown as a percentage. This is the second number.
  • Wheel size – This is the last number that appears. This is the diameter of the inner rim in inches.

The letters in between these numbers relate to the tyre speed rating.

These are largely irrelevant in this country to most motorists because of the
speed limits in force on our roads.


It is also extremely important to make sure the tread of your tyre is at the legal limit of 1.6mm.

ROSPA (the Royal Society for the Prevention of Accidents) recommends that you should change your tyres when it reaches 3mm, which equates to your tyre being 78% worn.

The reason why this is so important is because the tread determines the distance your vehicle needs to stop.

So if your tyres have an 8mm tread, they can stop in 25.9m in the wet. When your tyres are at the legal limit of 1.6mm, it will take 39.5m to stop in the same conditions at the same speed.

If you need any more information on the safety of your tyres, then contact one of our talented technicians on 01207 438155.

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