They are E range tires. I think they are rated at 80 psi. He keeps them at high pressure so he does not have to air them up. They ride like rocks when the trailer is empty. I air them down to about 50 when I use it and then let him air them up.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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