One coin, four grooves, zero excuses — plus when alignment, not new rubber, is the fix.
How the coin test works
Push a 20p coin into the main grooves. If the outer band stays hidden, you have legal tread. If you can see it clearly, book a free tread check — and check all four tyres, not just one.
Read the wear pattern
Worn in the middle means over-inflation. Worn on both edges means under-inflation. Worn on one edge only usually means alignment — new tyres without alignment just wears the new ones the same way.
Don't forget pressures
Check them cold, monthly, against the sticker in your door shut — not the number on the tyre wall. Correct pressures save fuel and double tyre life.
