I looked at your pic so I see what you're dealing with. My tires have a diametre of 29.5" but I got 16" steelies so I was able to get a 4" backspacing which pushed them away from the inner wheel well. They really fill it up. Since you probably don't want to buy new rims I wouldn't go for a full 29.5". You should be able to get away with a 29" tire but it would be tight. In my opinion since it looks like you're going for more of a "street look" rather than "off-road" the easiest way to will up the wheel well would be to lower your jeep. You'll be hard pressed to find a tire that would will up that gap at the top without giving yourself a lot of grief.