I've never taken a close look at anyone running CJ wheels, so I can't tell you for sure. I would say that you most likely do not need wheel spacers. My 33x12.5's are on 10" wide aftermarket rims, and they look to have a little more offset than CJ's, but RealRedSammi has 35x12.5's on rims that hardly have any offset, and he barely rubs. with 11.5 wide tires, you should be fine. Hopefully someone who actually has CJ rims will give you a definite answer.