Re: Max tire size on OEM wheels after OME 2" lift
With the OME 2" you should have gained around 3" in total lift. It is possible to use a larger tire than what can normally be used with 2" of lift from a budget boost which is 267/70/17 (31.9"). There is at least one WK running 275/70/17 (32.4") and another running 285/70/17 (33") with the OME. However, I would suggest a 265/70/17. With that size you will avoid many of the rubbing problems associated with the larger tires. The owner of the WK with 285's stated there was lots of rubbing on anything but level ground, and he decided to upgrade to the Superlift 4" lift.
As far as running the stock wheels. with the 275's and 285's you will pretty much have to run spacers. However with just the 265's you can get away with just cutting the bolt. Though that depends on what tires you go with. There is no straight answer when it comes to which tires will require you to do so. I would suggest just buying a set of tires and being prepared to cut the bolt if need be. The 255/75's you mention will most likely clear the bolt without a spacer, however once again there is no guarantee as some have had to cut it.
Keep in mind you can run a 1/4" spacer which will solve the bolt problem.
2010 Grand Cherokee S-Limited 5.7L 6" lift - 305/75/17 - AEV Savegre - modified ARB - RCV axles - Nitro 4.10 gears - ARB on board air - Q11000S winch
1998 Cherokee Classic 4.0L under construction
2014 Grand Cherokee SRT 6.4L mods coming soon!