There's a guy on Babybmw.net with F20 1 series who runs square 8" x 18" with et circa 35mm [similar to F30 series] and track 225 or 235 40 18 track tyres.
Perhaps acquire some used oem BMW 3 series alloys for track wheels ???
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Fettled M135i EB AT then AW M2 DCT - both gone but not forgotten:
Current '22 X3M LCI..
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