check out the search function.....
also, go look at your tires, stock OEM tire size is a 33 on a pro4x. so.......the answer is yes they'll fit with no lift. but wheel width, offset, and tire width all play into the equation. check my build thread for 33x13R18 wheels with a -18 offset (ran wheel spacers) on 3" of lift.
I put 33" on a 17 titan today, it will only rub at full turn or when hitting speeds bumps faster than 20mph... a 2inch spacer kit or inner wheel well trim will do the trick. or you can wait for 2 more months and Nissan will have a oem 3' lift that brags about 33" wheel capabilties with no trimming while maintaining factory warranty coverage... aka dont mess up your 5yr 100k b2bHonda's right, 33" is the OEM tire size for a Pro 4x (275/70/18 = 33.2x10.8), but they are not 12.5 wide, gotta know the exact specifications....Again, search function...
As Honda said exact tire size and wheel offset all play into the equation as to what will fit and what won't.