If the car is new enough to have steel belted radials when it was produced, and you're still running the factory size tires, then the door frame placard pressure makes sense.
In Europe and other places, they quite often publish a couple different pressures depending on load, even for passenger cars.
For trucks there can be a huge difference between the front and rear pressure, on the One Tons I've had in the past it was 55 front 80 rear with Load Range E 10 ply radials, quite often I'd lower the rears to 55 unless I was hauling or towing to keep my kidneys and fillings in place while driving unloaded.
Most newer cars run in the 35psi range, a while back pretty much everything ran 32.
For our older cars that were made before radials were, and you're now running radials, I think something in the 30-35 range makes sense.
In Europe and other places, they quite often publish a couple different pressures depending on load, even for passenger cars.
For trucks there can be a huge difference between the front and rear pressure, on the One Tons I've had in the past it was 55 front 80 rear with Load Range E 10 ply radials, quite often I'd lower the rears to 55 unless I was hauling or towing to keep my kidneys and fillings in place while driving unloaded.
Most newer cars run in the 35psi range, a while back pretty much everything ran 32.
For our older cars that were made before radials were, and you're now running radials, I think something in the 30-35 range makes sense.
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