What you need:
- Tread depth gauge
For all summer tyres a minimum tread depth of 1.6 mm is mandatory. In practice, we recommend a notably deeper tread: three to four millimetres for summer tyres, a minimum of four millimetres for winter tyres.
Every car tyre has wear indicators, small bars located in the longitudinal grooves of the tyre tread. When the tyre has reached a tread depth of 1.6 mm, these indicators are level with the tread.
The height of the wear indicators is not always exactly 1.6 mm. Therefore, it is much safer to measure the tread depth by using a tread depth gauge.