Find out what the legal requirements are for your vehicle's tyres.
The UK law states that a tyre must be 'fit for purpose'
This means tyre must;
Be compatible with the types of tyres fitted to the other wheels, not have any lump, bulge or tear caused by separation or partial failure of the structure.
Not have a cut or tear in excess of 25mm or 10% of the width of the tyre, whichever is the greater, and which is deep enough to reach the ply or cord.
Not have any part of the ply or cord exposed.
Have a minimum legal tread depth of 1.6 mm, and be showing 75% of tread pattern which must be central to the tyre as below.
A vehicle with any of these faults, or with tyres of different nominal size or aspect ratio on the same axle, is liable to fail an MOT test.
You can take a rough measurement of tread depth with a 20p coin*
Place 20p in the tyre tread.
Look at the coin with your eyes level to the tyre's surface.
If the border of the coin is not visible - the tyre is illegal.
* This method is not an exact method of measurement.
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