what is the biggest size tire that i can go without a lift? right now im running 25inch

 

I've run 27x9 front and 27x12 rear with no trouble, I'm running 11's on the back now only because the XTR's wernt available in 12 wide.

 

I run the same, 27/9 27/12, and i got a high lifter lift kit on my rubicon, and i lost tire clearance. i am going to have to modify my fenders to run bigger tires, but the lift help my exhaust and air cleaner highth ALOT!!!! totaly worth it.