According to the FAQ above, you can run 30" x 9.5" with little to no trimming on stock suspension. I can't remember if the Orvis came with Upcountry springs or not, but if it did, you should be able to run a bit bigger than the 30x9.5.
1995 ZJ 5.2L V8 318. 230,000 miles and still rollin.
I run 245/75 on my niner, thats about as much as I would stuff under it. Your orvis should have upcountry, you may be able to stuff true 31's.
Depends on what kind of driving you do, if you're gonna disco you won't be able to stuff as much meat under it at that height.
1996 ZJ Green Laredo V8, 2.5" OME and Bilsteins, 33's, Holes drilled in the roof.
1998 ZJ Platinum Limited 5.9, Backyard parts fodder
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style
Originally Posted by Texas ZJ1
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
When mine was just UC i ran some tall 245's and wouldn't go bigger especially if you're going to ever go on the dirt. I took it through some pretty serious stuff with it like that and it flexed well. But yea as kg6mov said, Orvis has UC but 31's would only be ok, if you dont hit speedbumps and dont go to the trails. Might have to trim fenders
i have a 2 inch BB and my 30x9.5s still rub a little bit at full lock. id hate to see what 31s would do at stock height, even with upcountry. it would be fine if you always drove in straight lines and never compressed the suspension
Reliability is relative
Granted I am completely stock, with 225s. But I flexed her out pretty good yesterday. I was disco'd in the front. I believe my tire hit that lovely pinch weld once or twice. Made a noise here and there. So even with stock tires, I still managed to hit inside the fender well. My advise is to just be careful flexing with bigger tires.
94 ZJ Laredo. 5.2 Crate engine. 6in JKS SA Lift. 33in Destination MTs. ARB Front Bumper.