255/30 on a 20" wheel will respect the stock rim+tire diameter. 265/30 would be ok too. That's for the rear. But again, I would worry about the wheel being too much on the outside.
Fronts are ok as long as you respect the original diameter.
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2018 M550i Sepia-Violet
Last edited by NTTY; 05-25-2015 at 02:46 AM..
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