Well, I wouldn't run 20" wheels on a Jeep at all. However, if you insist, the biggest tire you're going to comfortably fit at stock height is a 33" tire (which even then is really something you need a 2" lift for). If you want to go to a 3-4" lift, you can fit a 35".
I did have a 2” leveling kit with these wheels and tires and there were no issues but looks better with the 3.5”. Get any size wheels and tires you want.
I did have a 2” leveling kit with these wheels and tires and there were no issues but looks better with the 3.5”. Get any size wheels and tires you want.
If you're going to be offroading, I would reconsider, even with a 35" tire, you're no going to have enough sidewall. When aired-down, sufficient sidewall allows the tire to deform to the terrain, giving you more grip.