I have talked to my local dealer and they told me that the conventional tires will not fit on the BMW OEM rims (that goes with 18, 19 or 20's) due to the rim is special designed to fit the RFT.

Just in case the dealer's wrong about this, can someone confirm this, if this is true or not? Or, has anyone swap the non-RFT tires without changing the OEM rims?

I'll try to get a second opinion from a different dealer on Tuesday.