Should be stamped ET20 on the inside. That brings the wheel outwards relative to the normal e46 setup by about 21mm-27mm (about 5/8 inch to 1 inch). You should be able to get 16 inch tires at 205 width, I can't remember if 225 is also available within spec. I currently run 205 55s on my 16 steelies, I don't see why you couldn't, but it's not a popular size to be sure. Yes, it's a popular wheel choice for 3 series enthusiasts, but often at 17 inch. Many rock BBS style 5 17s et20, saw that a lot on e36, and some e34 5 series owners went with et10. $$$