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1% is literally a rumor that is pervasive on this forum and the internet in general.
There is no hard and fast rule documented anywhere, and frankly it's unlikely that BMW or anyone actually knows since testing these types of things is highly impractical and near impossible.
Try your best to keep front and back tire diameters the same. If they are not the same you may see an issue or you may not.
It does seem that 1% or less is safe.
End of discussion, nobody can say ANYTHING more conclusively.
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2025 M240i Xdrive TNM - Eisenmann Exhaust - Dinan Springs - CF Goodies - More in process...
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