It's against the law to have:
- Car tyres with tread worn to below 1.6mm;
- A mix of radial and cross ply tyres;
- Over or under-inflated tyres;
- Tyres with cuts, lumps, bulges or tears;
- The wrong sort of tyre fitted to a vehicle or trailer.
Checking tread depth
Most tyres have tread wear indicators, usually six or more small ribs across the bottom of the main tread grooves. When the tread surface is level with these ribs, the tyre needs to be replaced.
Checking tyre pressures:
Look in your handbook or consult your garage or tyre dealer for the recommended pressures for your vehicle.
You should check the pressure at least every two weeks, and only when the tyres are cold. Even a short trip to the local garage will warm up the tyre and raise the pressure.