With Jeep tires, you can go up to 4" wider on the tire than the rim it is mounted to. A 265 width tire is 10.4" and will stretch nicely onto an 8" rim. The 245 is 9.6" wide, will fit fine although if you wanted to run really aired down and wheel it, you might want to consider a 7" wide wheel to get a little better bead seating at low pressure. If you're staying on the street and doing all but the most difficult wheeling (ie: requiring beadlocks) then you will be fine with either tire size on those 8" wheels.
I agree that thinner tires are a good choice. I think overall people get caught up in width which doesn't provide many advantages in all-purpose use for the disadvantages it presents.
I am doing all but the most difficult wheeling. I have only ever driven with wide tires so I am used to the "float." I'm thinking about 245/75 duratracs. I have read that those will cut into snow and mud better. I'm interested to see/feel the difference. Problem is, I can only find 245/75/17 tires in 10 ply. Overkill, I know. I am putting a set on my wife's mall crawler. If she hates them, they are going on the WJ.
They are only 5 lbs heavier than the 6 ply. It made that much of a difference?
Putting heavy MT tyres on my gc affected performance and fuel consumption much more than I ever expected..... about 4mpg worse. The motor having to turn all that extra weight on each corner (about 10lb each corner in my case) affected acceleration noticeably too.Adding weight to the unsprung parts of the car (parts not supported by the springs such as wheels, types, brakes etc) also affects the handling much worse than adding weight elsewhere.
If you can't fix it with a hammer, you've got yourself an electrical problem!
My jeep sees tons of trail time so now I'm torn. I have read all about the wide v. narrow debates in a few forums. Seems like there is no perfect solution for all situations.
Even on the trail, I'd go skinny. IMO, benefits outweigh the downside, which is contact patch. However, if an inch less tire width gets me stuck somewhere, or can't maneuver an obstacle, I have other problems.
I am dealing with a lot of rocks, roots, and packed dirt but also the occasional bad drainage area. I have been successful in floating over those flooded areas with the aired down wide tires. Now, 10 ply tires aren't going to air down very well at all and they will be skinnier. That's my concern. Is it worth the change to skinny if I'm going to lose confidence in the ability to keep going when I meet that flood zone. Or, do I let it go and tell myself that is what the winch is for?