Hey I got the same set up as you. I thought with the 19". That the rim in the back is wider so you can put wider tires on. I was planning on keeping the 225 run flats on and summer time buy a nice set of tires with 255 in rear. Did you find out if you can or not. Again I thought front rim was 8" and rear 8.5". I hope I'm not wrong. This is what I could find.
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