if you wanted to get really fancy...
in a race setup, you want the vehicle as low to the ground as possible, and you can find that once you know the vehicle's wheel rates (a function of the tire spring rate and the spring rate of the suspension, effected by motion ratio) and know how much lateral acceleration and longitudinal acceleration the car will see...
Also, the tire will compress under static loading because it is a spring itself. If at a certain inflation, the tire spring rate is 2,500 lbs/in and you have a 3300 lb vehicle w/ 50/50 weight distribution, thats almost 3/8" of compression, just in the tire alone...
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