I am in the same boat, I currently have a 2009 335xi with the 4 x 225/45r17 stock run-flats. I am looking for aftermarket 18" wheels in 225/40r18 and 255-265/35r18 run-flats.
I don't mind the RFT stiffer ride. Handles just fine for me, and NJ roads are the lunar surface I too prefer the safety net of RFT.
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