I've been running 19s with 255 front and 285 rear on my x5. No problem. I don't think 20 mm front and 30 mm more in the rear will to a big difference. I might go for 20" when I order my F15.
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/Fredrik
i7 xDrive60 -23 Sold: iX -22, X5MC -20 (F95), X5M50d -19 (G05), X5M50d -17 (F15), X5M50d -14 (F15), 116d -13 (F20), X5 3.0D -10 (E70), M3 -10 (E93), 320DX -10 (E91), 320D -08 (E91), X3 30D -07 (E83), 335 -07 (E92), 325 -05 (E90), 320 -02 (E46), 318 -00 (E46), 320 -93 (E36), 318 -89 (E30)
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