When do tyres need changing?
There are three important factors to bear in mind: age, tread depth and possible damage. You should inspect your tyres regularly – at least once a month. Most tyres have tread wear bars - bands of hard rubber that you can only see when your tread depth has gone beyond the limit for safe driving, which is generally 1.6mm. Tyres should also be replaced if they are more than 10 years old – even if the tread depth is still adequate.
You should also check your treads for uneven wear patterns that can indicate other problems with your tyres or your vehicle. Tyres should also be replaced if there’s a bulge or a blister on the sidewall of a tyre. These can lead to tyre failure and could be dangerous.