Went with 18in because I planned to travel with my new M340i. I too think the 19in look better (when rarely clean plus they show off the calipers more).
My older 330ci has different size directional tires that are not supposed to be rotated and they start to develop road noise after 10k. I rotate them backwards (on the same axle) every now and then for a thousand miles to get rid of the cupping and quiet them down again, but don't like the hassle.
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