Here you go…..if I’m reading this right then it’s ideally a max of 2mm with tolerance up to 3mm
except on XDrive cars. We have a limit of 2mm max
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I’ve never managed to get a set to last four years so will never have oldest > youngest that far apart. I’ve always had to change them as a set, and that’s expensive if a non-repairable puncture etc happens

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