do tires measure there full size just by themselves or do they expand once you put the rims on and air them up??? im just wondering because my next big work shop isnt till thanksgiving break (high school sucks) and my new nittos only measure 35.5 inches tall without the rims on it. they are suppose to be 37's and i dont have time to trim the fenders till thanksgiving break. and i really want to be able to drive it. i repeat drive it. no real wheeling yet. so would i be able to get away with it?