The axle is in the center of the wheel, and the axle carries the load to the tire. As the load increases on the center of the tire, it puts more pressure on the bottom of the tire, which compresses and distorts and moves the air to the upper part of tire, above the axle. So, at any given moment the pressure inside the tire is the same, but the air is being displaced from under the axle as the load on the axle increases.
Now, imagine you have a tire with 10 psi in it, and it is laying on the ground, flat. If you put a heavy weight on top of the tire, the air will be compressed inside the tire as the load is from above, not from the center. Think of air bags suspension on a big truck. Most guys who drive triaxle can roughly tell you how much weight they have in the truck by the air pressure needed in the bags to keep the suspension up.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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