Hello, just my 2 cents, I have a 2002 limited german spec and my summer tires are 255/55R18's and i have no rubbing at all. I have seen from others that this is what you need for rubber if you are running stock suspension. It works out to the same 29 inch tire. However, I got the rims with the jeep and the manufacturer is no longer in business (Deszent, i think) so I dont know if backspacing is the same as the JK ones you are looking at.
Daily driver for 2 years now with 255/65r17's and there is a slight rub full lock at medium flex. Narrower might be better but I do like the way my current size looks on it - definitely meatier than the factory 16's and what was on it when I got it.
Yes, the JK Wranglers have 16's, 17's, and 18's. Since mine is just 2wd, I run the 18's . With my 18's and 255/55's, I rub at lock, usually when pulling into tight parking spaces. Just seems to rub the wheel well liner and not any fender or bumper. I've had them on for almost a year and the rubbing is not a big deal at all. The 255's do like very nice, both in the front and back. Gives the front an agressive look.