Rear camber is normal for BMW. If you don't drive aggressively and/or track, you'll wear the inner tread off early.
Our X Line 35i is far from stable over triple digits. Our 135i was similarly squirrelly though both on staggered RFT's and staggered summer non RFT's. Even with a much shorter wheelbase, my M Coupe was much more stable than either the 1er or X1, plus it actually had steering feel and wasn't under assisted, unlike the other two.
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