i found it's cheaper in the long run to buy some 15" steel wheels and 31" tires than trying to buy super expensive hard to get 26 5 70 17's... now if i have a blowout in the middle of nowhere, a 31x105x15 is easy to find used to get me going again.
however, you will need to lift your wj if you plan on running anything other than the stock 235's...
98 xj, 32x11.5 BFG KMs, welded rear, Long arms, 4-4.5" lift, custom bumpers, winch, H4 conversion, etc.
07 chevy duramax, CCLB, Banks stuff, 18" rockstars, 5" exhaust, HIDs, big stereo, and more.
kawasaki zx-12r 190 hp of pure death!