I called BMW a couple of weeks ago as I was wondering what the biggest rim size was for the xi models. They said stock, the biggest you can go is:
225 35 19 front
8x19
Offset 37
255 30 19 Rear
9x19
Offset 39
The ones you are looking at are a bit bigger, you may need spacers but ultimately, won't know unless you try it.
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