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I ran these numbers once using 220Ms and 359Ms as baselines to determine changes in track and the outboard positions of the wheels to predict appearance and handling changes when I was looking at a square setup. Surprisingly, ZCP wheels create a NARROWER track than 220Ms despite their extra width because of their offset, even though the ZCP press releases talks about aggressive offsets. I don't know the starting track widths offhand (though that should be in the M3 Supplement at the back), but here are the relative changes. Sorry for mixing inches and millimeters, did it because offsets are in millimeters and wheel widths are in inches:
220M Fronts: 19x8.5 offset +29
220M Rears: 19x9.5 offset +23
APEX EC-7s: 18x10 offset +25
From 220Ms to EC-7s:
Front track: +8mm
Front wheels move outboard 0.9"
Rear track: -4mm
Rear wheels move outboard 0.17"
359M Fronts: 19x9 offset +31
359M Rears: 19x10 offset +25
From 359Ms to EC-7s:
Front track: +12mm
Front wheels move outboard 0.74"
Rear track: Same
Rear wheel positions do not change
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