I had changed the RFT to non RF on my old F01 and that made a hell of a difference but with this one (a 730d G11) I had stock RFT and have recently changed to a different brand RFT that has also made quite a difference in noise...mind you I'm on poor man's 18" wheels as well but moving to a set of Pirelli P Zero RFT's has definitely reduced road noise and still kept the convenience.
Not sure if it would be as discernible on 19 or 20" rims though...
Hope that helps.
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Previously: 2011 F01 730d, 2008 E90 318d, 1996 E36 318i Cabrio (D)
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