Tyre threads are the flavour of the month it seems Today whilst having some tyres fitted I saw a stack of old customer tyres. I was quite surprised how low some of the treads were, maybe 10-20% were below the legal limit. So when do you change your tyres? Please vote in the poll above. Me? Roughly at 2-3mm ie. before the wear marker (2mm I believe) Here's one such tyre I saw.