Well, if you can't trust BMW's own published numbers, I guess you'll need to take the wheel off and inspect the back. The actual size of the wheel is stamped on the back of one of the spokes near the center hub.
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Sitting on a beat-up office chair in front of a 5 year old computer in a basement floor, sipping on stale coffee watching a bunch of meaningless numbers scrolling aimlessly on a dimly lit 19” monitor.
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