Originally Posted by The_YJGuy88
a 10.5" wide tire will not fit on a 7" wide wheel.
They will fit fine and are probably a better choice than a 10" wide wheel. I actually run 11.5" wide tires on 8" wide wheels. But you are right about needing more backspacing.
I'd highly suggest getting a 15x8 wheel, either steel(for cost reasons) or aluminum with at least 4" of backspacing because of rubbing issues.
A 31" tire will fit on a stock suspension TJ, but you might rub if you disconnect the sway bar up front... so look into bumpstops if you decide to get disconnects.