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Look for "LT" rated tires. The LT stands for "light truck", as opposed to "P" rated tires for "passenger vehicles".
LT tires are generally made with thicker sidewalls and a harder, and therefore more durable, rubber compound. Also, some "LT" tires have better warranties than "P" rated tires. Check the warranty on whatever you buy.
I use tires from "Big O", a dealer here in BC. Their own brand of tires is actually made by Kumho. I don't know if you can get them outside of Canada, but I buy them because they have a no-questions-asked lifetime warranty. Tear a sidewall out on a rock or something, bring the tire back, and they give you a new one!
Truck tires are as follows:
A/T = All Terrain. These are the least aggressively treaded truck tire
M/T = Mud Terrain. These are generally the most aggressive general purpose tires one would buy. They have the most distance between each lug on the tire surface. More room between each lug equals less opportunity for mud, sand, snow to clog the tire, because the centrifical force of the tire spinning caused larger clumps of junk to be thrown clear.
Boggers = These are basically tires that copy the pattern you see on tractors, heavy equipment, etc. They are made by Interco and Thornbird, among other smaller companies. They are great for off-road driving, but generally not recommended for road use. They are generally softer than the average LT composite, because they need to run at lower pressures and "wrap around" rocks, etc. They're also insanely expensive.
X/T = Some manufacturers offer this grade, which is a compromise between A/T and M/T. They are a little more aggressive than A/T, but are still very pavement-friendly. I switched from M/T to X/T a few years ago, and I haven't observed much loss of off-road performance. They're not as effective in thick mud as an X/T would be, but all other surfaces, including dirt, clay, show, sand, and all but the most gooey mud are no problem.
If you can find X/T's, I'd go with those. Failing that, look for any reputable brand A/T. Either of those will serve you well.
Also, the Kumho Venture M/T line are supposedly slightly milder than the standard M/T, and are pretty comfortable on pavement.
Now, as far as sizing goes.
A tire is coded as follows (example): 31x12.5R15.
The first number, 31, indicates that this tire has an outside diameter of 31". The second number is the tread width, in inches. In this case, the tire is 12.5" wide. The last number is the rim size. R15 means that the tire is designed to sit on a 15" rim (which is probably what your Jeep has). You can fit a 10.5 wide tire on any width rim, but I suggest that if you're going to get the wider 12.5" tread, you should have a minimum rim depth of 8".
you can squeeze a 31x12.5R15 tire under your Jeep as-is. There might be a slight bit of rubbing during sharp turns, but that can be eliminated quite easily. If you look under your Jeep's front axle, you'll see a small metal cylinder on each wheel hub. Those are the steering stops, and they litterally stop the wheel from turning more than it should. They are just screwed in-place. Unscrew each one, put two small washers on the steering stop shafts, and sscrew them back into place. What you've done is effectively made each steering stop slightly longer, and they will limit the turning radius enough to prevent the tires from rubbing when you turn. You lose a little bit of turning radius, but you won't notice the difference. Alternately, you can use a 31x10.5R15, which is two inches narrower than the 12.5, and have no rubbing issues at all.
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