I'm running Duratrac 33's by 12.5 on a 15 inch rim (specifically the MB 72 rim) that has been the talk over in the JK forums on an early 2012 Sport JKU
Now: 33" on a 15" rim, 2.5" AEV lift
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Stock: Stock 17" sport tires
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I have a 2.5" AEV lift.
I actually get less road wander with the Duratracs than I did with the stock tires and the ride is better. I have had no issues with the 15" rim. When it's time to upgrade the tires though, I will probably go with a 33 or 34 on a 16 or 17" rim and will only go about 10" wide on the tire. The only issue I have had is on wet roadways, the wider tires love to grab standing water and I really fight the wheel. I think thats more of a Jeep characteristic than a product of wide tires though.
Now: 33" on a 15" rim, 2.5" AEV lift
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Stock: Stock 17" sport tires

I have a 2.5" AEV lift.
I actually get less road wander with the Duratracs than I did with the stock tires and the ride is better. I have had no issues with the 15" rim. When it's time to upgrade the tires though, I will probably go with a 33 or 34 on a 16 or 17" rim and will only go about 10" wide on the tire. The only issue I have had is on wet roadways, the wider tires love to grab standing water and I really fight the wheel. I think thats more of a Jeep characteristic than a product of wide tires though.