So if you put radial tires on a 50s truck you should go by the owners manual ,no you go by the tire specs.on the tire thats what the tire was made to operate in,that wt. and air pressure.When you buy tires for say a 2005 1/2 ton chevy truck the place you're getting you're tires from should sell you tires that are made for you're truck that will match the owners manual spec. on the tires.If you change things as putting radials on a 50s truck like I did you need to operate the tire as per the tires specs.on the tire.
Pete
