Checking your tyre tread depth is one of the quickest and most important safety checks you can do. It takes about two minutes and requires either a 20p coin or a tread depth gauge (available from any motor factor for around £2).
The legal limit
In the UK, tyres must have a minimum tread depth of 1.6mm across the central three-quarters of the tyre, around the full circumference. Driving below this is illegal and carries a penalty of up to £2,500 and 3 points per tyre.
Method 1: The 20p test
Take a 20p coin and insert it into one of the main tread grooves. If the outer band of the coin is hidden, your tread is above the legal limit. If you can see the outer band clearly, your tyre may be at or below the legal minimum and should be checked by a garage. Do this in at least three places across the width of the tyre and in several places around the circumference.
Method 2: Tread wear indicators
All modern tyres have tread wear indicators moulded into the grooves. These are small raised rubber bars set at 1.6mm depth. When the tyre surface wears level with these bars, the tyre is at the legal limit. Look for a small triangle or the letters TWI on the tyre sidewall pointing to the indicator location.
When to check
Check your tyre tread at least once a month and before any long journey.
Watch for uneven wear
If a tyre is wearing heavily on one edge but not the other, or wearing faster in the centre than the edges, that is a sign of incorrect wheel alignment or tyre pressures.
If you are concerned about any of your tyres, bring your car into Steins Garage for a free visual check. Call 0131 554 3423 or contact us here.