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If you are using the regular BMW Style 230 19" wheels, then 265/30/19 is about the widest you should go, as it's only a 9J wheel. 285 section will definitely be way too wide for the wheel.
It's a different situation if you're using a 9.5J or 10J rear wheel, but then you'll have to play around with offsets and maybe wheelarch rolling to avoid rubbing...
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