[simianspeedster]

I'm piggybacking on this thread because it's directly on point with my question.

I'm very likely to order a 128i in a couple months and, if BMW allows the combination of M-Sport and the upcoming 1 Series Lifestyle Edition (hate the name of that package but love the brown leather), the car will likely come with 18x7 fronts and 18x7.5 rears. I'd plan to ditch the runflats right off the bat and go square (225/40-18 all around).

Is there any problem/risk/disadvantage with the difference in wheel width or is it largely immaterial with that tire size?

Thanks in advance!