Got new tires this fall Coopers, on the side says 80psi, but no other psi.I haul lumber and tools around but not a thousand lbs. at a time . I try to get 2 winters out of a set of overpriced rubber, dont want to wear down the center by running 80 if I shouldn't. So tonight I put 45psi in till I hear yalls opinions. Cooper Discoverer load range"E"
Thanks in advance. Matt

 

I run 40 to 50 psi in my tires. Rated at 80 psi load range d BFG all terrains. Much nicer ride too. They are on a 2500 yukon xl.

 

Not that this is the right section for this but I run 65 in winter and 80 in spring through fall. You'll get better gas mileage running proper psi. and you can actually wear a tire faster under inflated.

 

With truck tires I experiment until I find the optimum pressure. I paint or tire chalk a wide stripe across the tread and drive it around for a bit with the same load I'd normally have. I adjust the air pressure up or down until I get a consistent wear patch on the stripe. You can do the same thing for various loads you may tow or carry so you know how to adjust the tire pressure for the given load.

It takes some time but the tires wear more evenly once you get the pressure optimized for the load you carry.

 

look on the door jam of the truck or the owners manaul and you always go by what the vechicle recommends and not what is on the tire. w/ that high or pressure it must be a high load range tire(alot of ply tire say,10 or better).

 

I second captainquint.

Running lightly loaded I run the rears slightly less than the front, easier on the centerdiff of an AWD.

 

+1.....What is stamped on the tire is the maximum air pressure allowed in the tire depending on application. Or for an example if what is stamped on the door jam calls for more than 80lbs, the Cooper would be the wrong tire for that application. If say 60lbs is stamped on the door jamb then the Coopers would be OK for that application.

 

Very good idea.

 

X3 The pressure marked on the side of the tire is the maximum pressure at which the tire can carry its maximum load. The normal tire pressure you want to set your tires for is on the door jamb of the driver's door. The only time you want to deviate from that pressure is if you put an extremely heavy load on the tires at regular pressure. If the load makes the tire seem flat (radials look a little flat) you can adjust the air pressure up to the maximum if needed. The pressure on the door or in the manual gives the best combination of tire wear, fuel economy, and how the truck handles. If you overinflate you'll get better gas mileage but the center of the tire will wear more quickly and the handling will be more harsh. If you underinflate the tire will wear on the outside prematurely, gas mileage will suffer, and the handling will get sloppy.

The reason you go with the truck's listed pressure is they are balancing the weight of the truck with fuel and passengers, the handling, and the overall economy. You can have two completely different trucks riding on the same tire. What is good for a GMC Sierra 2500 is going to be overinflated for a Toyota Tacoma or Nissan Frontier.

Worked tire installation for several years. Hope all the information helps.

 

F350 diesel, i run 65psi front and 70psi rear, when towing my trailer i run 75 front and 80 rear. If you go too low such as 45psi on a load E tire then your fuel mileage will drop.