I've only run 12.50s in both BFGs on my TJ and Nittos on my JK. All the other guys have good input and I'd take into consideration what they said. I'd also check things like clearance in the fender wells and on the outer lip of the fender flares when fully stuffed, as well as rubbing on the front lower control arms which is common as well. All depends on wheels and their backspacing as well, but again a 13.50 over a 12.50 isn't much of a difference.