Do 265/30 in the front; they fit easy.
For 19x10.5 +25 in the rear on a 285 tire; you may want a 5mm spacer. FWIW, I ran a 19x11 +25 using 295 tires (half inch wider rim, so it sticks 1/4" further out than yours) and I was about as flush as I could get without getting nasty with the camber.
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'08 E90 w/ just boltons
'09 Z4 sDrive35i w/ just boltons
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