Campin LI wrote:
When setting the tire pressure, do you set it when the truck is loaded or when it is empty
Either works fine as they both will be the same. I can load my 8000 lb tractor on my GN trailer and tire pressure cold set at 80 psi is still 80 psi even with the tractor sitting on the rear of the trailers deck and mashing the tires on the rear axle nearly flat. No I don't pull with it sitting there.
I'm assuming empty but a co-worker says the pressure in the tires will be higher after it is loaded (if you pump tires to max psi, they will be over max psi and then when they heat up they will be way over). He is probably right but is it a negligible difference, anyone know?
Tires will heat up with highway speed/sun which raises pressures. All is normal as the tire are designed to do this. If you notice tire makers say to cold set your tires pressure and not bother them.
I've seen my E tires on my truck and equipment trailers go to 90-92 psi at highway speeds on a hot day at max axle loads. The next morning their back to 80 psi.
