I think the staggered setup looks cool and I'd stick with it. Upping the front size would likely hurt ride comfort.
BMW seems to want to up wheel sizes and make the tyres progressively skinnier over time. What's the profile of those 20 inch rears? 30? Yikes.
Think I'd prefer the 18/19inch option so I don't rattle my teeth loose and worry as much about the odd pothole. Lower profile tyres kerb more easily too...
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