The rule of the thumb: How long should tyres last?
There are no statutory prescriptions on how long a tyre might last. The only exception is: tyres for trailers that have a special permit for a maximum speed of 60 mph may be no older than six years. In all other cases, it is up to the driver to decide when the tyres have exceeded their lifespan. Nevertheless, the road traffic regulations stipulate very clearly that a car with all its equipment must be roadworthy at all times. That, of course, includes the tyres.
There are a few criteria that will help you to decide if you can keep using your tyres and when you should replace them. As a guide, the following applies: You drive with four similar tyres, each of which has a tread depth of at least 1.6 mm (legal minimum tread depth), and are no more than ten years old.
Please note: Safe driving in wet and snowy weather conditions is affected by the tread depth, the pattern design and the rubber compound of the tread of your tyres. On wet or snow-covered roads braking performance will progressively decline with lower tread depths. On wet roads there is an additional increased risk of aquaplaning with fading tread depths.
Therefore, check your tyres regularly, reduce your speed on wet and snowy roads and consider replacing your tyres in good time.