Re: largest tire to fit on stock h3?
You can run the 315's w/o a problem. At most they will rub on the sway bars and they will only do that if you crank the t-bars (OBTW - They will rub on 285's if you crank the t-bars too).
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Rob (Ipedog - Say "Ip-E-Dog")
Black Sheep HUMMER Squadron 
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