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 - Engine Basics: Spark Plug Cleaning - by Staff. Cleaning procedures: Brush or blow dirt from around the spark plug base. Remove the plug with a correctly fitted wrench. Examine the porcelain insulator and points. If the insulator appears to be melted or blistered, cracked or broken, and the points seem unduly burned it is evident that the plug is operating too hot and it should be replaced with a colder plug. If the plug is fouled excessively with carbon it apparently is operating too cold and it should be replac
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