what is the biggest tire that will fit the stock 20's at factory height (no level kit). I was looking at a 275/60/20 which is about an inch taller than the stock 275/55/20. Any suggestions. Thanks.

 

I just had 305/55/20 Nitto Terra Grapplers mounted on 20x8.5" MB Yuma's installed on my 07 4x4 Super Crew yesterday. I have no rubbing anywhere, even at full turn. I think they would rub if I hit a good enough bump at full turn but it's not an issue on the smooth stuff.

I have not installed a leveling kit but I am getting one on Tuesday just for good measure.

 

I'd stick with a 305/55-20 (33x12.50).

 

How about 22". What is the optimum rubber size? What about with a leveling kit? Not sure what's involved w installing a leveling kit, but I assume it clears a bit more room for rims and tires.

 

Probably 305/45-22 (33x12.50). Personally, I'd want at least a 37 inch tire with 22's.