I will need more information to begin the math. radial tire or Bias ply? Diameter of tire? Biggest info is Air pressure in tire. Weight of vehicle actually putting on the tire. What is the distance of the dot to center axis of the tire?
My initial thoughts as radial tires usually look flat, or low on air due to bellowing out the bottom part in contact on the road. The sides and top are held in normal shape due to pressure of air in tire, relatively to atmospheric air pressure.
If the tire is at proper inflation, the center of the tire will be closer to the ground because the tire flattens out to provide road traction. If you increase the tire pressure, the flatten part will decrease, raising the center up. Vice versa if you decrease tire pressure.
So my initial answer would be what is the radius of the circle created when the dot was touching the ground, vs when it was at 12 o’clock.
Then when you throw the speed of 100 miles into the equation, it will make a difference in the Outside diameter of the tire. If we are taking a 12” diameter tire, that will be rotating very fast, vs a 36” diameter tire, that will be rotating 3 times slower, the centrifugal force of the tires rotating will be different, based all the other criteria I asked for in the first paragraph.
A good thinking question when you get down to it.
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