Regarding tire size increase without a lift kit, you're limited. Going much larger than the stock size will likely cause rubbing on the fenders, frame, and steering components. The stock size varied slightly depending on the options selected, but was generally in the 30-31 inch diameter range.
You'll likely be able to fit a slightly larger tire (maybe up to 31-32 inches in diameter, depending on the specific tire's sidewall and tread design), but any more than that will almost certainly require a lift kit to avoid rubbing. Even with a 31-32 inch tire, you might need to do some trimming of the fenders or bump stops.
Before purchasing any tires, it's crucial to:
* Measure your current tire size: This is usually written on the sidewall.
* Research tire sizes: Look for tires with a diameter slightly larger than your stock size and a similar or slightly narrower width. This might mean a taller, narrower tire for the same overall diameter.
* Check online forums and Jeep communities: Many CJ-7 owners have documented their experiences with different tire sizes and whether or not they needed a lift. This is the best way to get real-world advice.
* Consider the backspacing of the wheels: This is the distance between the mounting surface of the wheel and the inside edge. Incorrect backspacing can cause rubbing even with a lift.
Trying to cram oversized tires onto a CJ-7 without a lift kit can severely restrict articulation, handling, and potentially damage your vehicle. It's much better to be conservative with your tire size selection unless you're prepared to install a lift kit.
