What is the minimum permitted tread depth of winter tyres?

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What is the minimum permitted tread depth of winter tyres?

Winter tyres used in winter road conditions must have a tread depth of at least 3 millimetres. To get the best grip, you should replace winter tyres when the tread depth has been worn down to 4-5 millimetres.

Check the tread depth at regular intervals using a tyre depth gauge.

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