Originally Posted by Radiation Joe
It alters the scrub radius. I'm not sure if it "significantly" alters the scrub radius. The BMW recommended wheel width and offset is 18x8 et20 for winter use. Remember 9mm is like 3/8 of an inch. Not significant in my mind.
What do you consider to be significant offset change?
Does BMW offer a winter wheel package at those specs then? If they do, how much?