You have to remember that the EU has a requirement for snow chains to be compatible with the OEM tire sizes...or something. So BMW cannot have the tires flush with the fenders.
As a rule of thumb, I've been told that a 12mm spacer will push the tire to about even with the fender.
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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