I have 33x12.50-15 on my 4by and run down to about 25 psi, but have them at 32-28 for better mileage. You can't go on looks with a radial. I have probably 30 or more people pull up to the shop for air checks each day saying either they thought their tires looked low or somebody else told them they looked low. Tires be what I do
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