trying to find out largest size tire i can run on stock 17" moabs with no spacers on a 2" rustys suspension lift on a 2011 jku sport.

 

I believe they recommend 33 to 34 inch tires with that lift. 295/70/17

 

35s with an aftermarket front bumper and flare trim for no rubbing. Leave it stock and you might have slight rubbing but nothing major.

 

Without increased bumpstops or trimmed flares, you WILL rub really bad offroad when disconnected with only a 2" lift.

 

your gonna want 33's. they should fit great, they might rub inner fender at full flex. they shouldn't rub while turning, but I'm not sure! sorry not much help there!

 

An 11.5" wide tire is pretty much as wide as you can go without wheel spacers. Any wider and you run the danger of rubbing either the rear control arms and/or the rear swaybar. Also if the rear swaybar links are too long because of the lift they might hit your rims. There is a way around this if you are interested, click on the 'no spacers' link in my signature.