I changed from 19" 351's to 20" 356's both with run flats and found a big drop off in ride comfort. Constantly looking at the road for potholes, but love the look of the wheels so glad i bought them. however, I'll be looking to change to non-run flats once the tyres run down in the next 6 months.
So if its looks you want get 20's, but if its comfort you want, keep the 18's.
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