I have the 252s with dunlops and find a less harsh ride than on my E70 with 20s with Dunlops too. Just put 18s with winter tyres on my F01 and noticed a significant improvement in ride comfort. I guess you'll notice a similar step difference going the other way if you opt for the 20s.
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Fastbuck
2012 F01 740d M Sport Alpine White Oyster/ Oyster
2013 E84 X1 1.8d M Sport Alpine White Black/ Black
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