At the end of last year, during the Paris Motor Show, Michelin reaffirmed its position on tread depth. The leading French tyre manufacturer believes a tyre should perform well throughout its whole life. And seeing as the European legal tread depth limit is 1.6mm, this means all the way down to this particular tread depth. Taken in isolation, this is a strong argument that basically no-one would contradict. So why did we immediately receive strong feedback from companies and associations? What are the counter arguments? And what are the implications of adopting such a stance?