20's on an e36 is crazy, I went with 19's and noticed a-lot of difference in acceleration etc compared to my 17's I had before...Putting 20's on an e36 is kind of taking it a little too far. I know others on here agree with me. Hey if they fit and you are going for looks and no performace, go for it, but if you want to blend looks and performance I would go with an 18 inch wheel...I am not sure on this but I believe you can fit up to a 255 on the rear, 235 on the front, maybe 265 rear but that would be pushing it, passengers in the rear may make the tires scrub going that wide...
-1998 BMW 540i6(Axis Penta 20's,M5 shadow grilles,trunk lip,led tails,oem front lip,PIAA lighting)
-2002 Cadillac Escalade(Zinik Luina 22's,OEM HID upgrade)