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or almost flat and for more than a few yards as well
And therefore I think it needs replacing...driving tyres whilst flat or with very low tyre pressure generates significant heat and possible damage to the carcass...
How old are they? Tyres don't just wear out they fail due to old age too. Five years is the maximum life expectancy of a tyre IIRC regardless of the amount of tread left, as they degrade and become weakened.
They were on an 06 car, but that doesn't mean that they are only 2 years old.
I told the guy that all 4 needed replacing and he said they'd put it through an MOT to see what they say, to which I replied that irrespective of the MOT it'd need 4 new tyres before I bought it.
Looking at a few at the minute, I'll keep you updated.