Status update: I purchased a set of 212 (19") rims off of eBay.
-Does anyone know if I can simply take off the 214's (20") and pop the 212's on?
-Can I use these 212 without TPMS sensors and turn off the error warning?
-If I go with non-RFT's on the 19" and get a spare, will the spare also work with the 20"s?
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-I need to decide if I want to go with dedicated winter tires for the 19's or go All-Season and possibly sell the 20's or go with All-Seasons non-RFTs on the 20's too and sell the 19's. Hence my questions about the spare working for both sets of tires.

I took a roadtrip to PA and am even more in lust with the X5. I got my MPG avg. up to 19mpg! Yeahhhh!!! Who needs a Prius???