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First off, I dont know why we are trying to get a square patch, an article in a tire ad? i measured my mountain bike tire. front was 3 by 1 and back was 4 by 1, at 50 psi, i know those square measurements but i weigh 250 and it come out to 350. The point is though i know that my mountain tires are not fe compared to road tires. The tires should still be skinnier although the patch is way longer than it is square. I then measured my car front 4.75 by 4.24 averaged and figured round (by franks sugestion) give me a weight of 1177 back was 4 by 3.75 both with 50 psi and a weight of 706. Total of 2354 lbs and my car weighed 2300 on the scales. By the way to get an accurate area use carbon paper, jack car up and put under, let down. Use that paper to figure area and make sure that ur presure gauge is accurate. Still I would think that a square contact patch is not a goal, like a bicycle longer and skinnier will be better.
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