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Some factory wheels are 315s. Use the tire rolling circumference calculator to keep the rolling circumference as close as possible I wouldn't want to do more than 1% difference. Tires will often have a rim width recommendation and I would stay close to that.
255/55/18 I've mounted on 7.5 to 8.5 rims without any issues but I would not recommend going thinner unless you run a thinner tire like 235/60/18.
I would not change the lugs. The bolt method like BMW uses is superior in numerous ways
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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