You can go with 16, 17, or 18 inch wheels, as all of these are factory options. Some have reported certain 15's with appropriate backspacing will fit. Looks wise, I prefer 17" on the JK, especially the 4 door, but that's just an individual preference. There are more options available for 17" than there are for 18". Without a lift kit or anything, you can safely go with 32" as this is what comes on the Rubicon, and incidentally, is the same size you have now on your 18" wheels. Some people run 33", but report minor rubbing with heavy wheeling. It's hardly worth the expense of new tires for only a 1" gain in diameter. Budget boosts will raise the Jeep 2" and get you a little more clearance for cheap (enough for 33" without rubbing). A good 3" regular suspension lift will let you run 35" without a problem. If you stay with the 18" wheels and go with a 3" suspension lift and 35" tires, you will need wheel spacers. If you want aftermarket wheels, 17 X 9 with 4.5" backspacing works good with 315/70-17 tires (which is 35" for those of you in Rio Linda) and a 3" suspension lift. That combination will not require wheelspacers because 4.5" is adequate backspacing. Here is a picture of my BF Goodrich All Terrains 315/70-17 on 17 X 9 wheel. I had it just sitting on the ground in front of my truck, so there is something to reference to for size. My JK is still on order (since February 24)
Last edited by Prot; 09-25-2007 at 03:55 PM..