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Not to sound too simplistic here but I think the easiest is to kind of say what the "max" (subjective, I know) sizing we can run is, and from there one could scale back if need be.
To help, I think most Z4M guys run 18s. Some 19s, but it's similar either way.
For an 18" setup, the "near-absolute-max" size one can run in the front is 18x9.5 +35 on a 245/40 or a 255/35. This also depends on a camber setup, but that greatly increases one's ability to stuff something a little bigger (ie. a 10" wheel or a 275/35 tire) in the front fender. Expect rubbing and to have to do fender mods. The reason I say +35 is because even a 9.5" +38 wheel will contact the strut, I think.
In the rear, the generally accepted "max size" would be 18x10.5 +22 on a 275/35/18. One can go bigger, but expect to have to raise the car slightly, run a stiffer rear shock/spring combo, roll the fender, camber arms, etc etc. At 10.5" wide and +22 offset, we are getting close to the inside max width as well. I don't expect an 11" +20 to fit without rubbing the inner fender liner thingy... lol.
Anyone else care to chime in?
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