Quote:
Originally Posted by AK Mule
The "P" to "LT" is correct, and a bigger tire will hold more air. More air (volume) is not more pressure, though. Actually, a bigger tire can have a larger load rating at the same pressure. It has more air (volume) to hold up the weight, and doesn't always need more pressure, if they are both "P" or both "LT". In this case, switching from "P" to "LT" is the reason for the pressure increase.
If you went from one size "LT" tire to a larger "LT" tire, you could decrease the pressure and have the same load rating because you have more volume. Volume is constrained by the size of the tire, pressure is not. Volume holds up the truck, not just pressure.
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That's not how tires work.
Also you could definitely require a different pressure changing LT tire sizes depending on the load index.
