If you're at stock ride height, you can easily go with 255/35/19 front and 275/35/19 rear. You're spacers may be a little aggressive but would be better with 15 front and 12 rear ( not the other way around).
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2018 M4 MW/SO
2018 X3 M40i PB/CO
2005 M3 TiAg/BL
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