Tire PSI on a 1500

[Spree]

40 on my Coopers.

 

[Dusty]

I think you'll find that the tire pressure placard on the door frame will list the tire pressures for the tires that are shipped with the vehicle from the factory. I've compared tire pressures for my vehicle to another that had the same body, trim, and features, but different manufacturer tires of the same size, and there was a difference.

Regards,
Dusty
19 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33-gallon fuel tank, 18” wheels. Build Date: 3 June 2018. Now at 1076726 miles.

 

[Racer9]

The door sticker is the federally mandated information that is supplied by the manufacturer and is specific to your vehicle, hence the Vin # on the sticker. This info is based on the vehicle specs such as gvwr and suspension specs. Changing tires to another brand does not change the vehicle specs such as weight. The sticker also states "cold " inflation specs so no need to calculate "hot" tire pressures.

I would agree with most of this post. The door sticker is meant for OEM tires. Changing to a different tire most certainly will change optimal tire pressures, unless you stick with only OEM tires. Many of us swap to a different tire based on our needs/wants, and then the recommended pressures on the door sticker become moot.
IMHO the pressure and weight ratings printed on the tire are far more important.

 

[1 MEAN66]

Door sticker is also the pressure recommended for your vehicle in the stock sized tire which covers everything that the truck is rated to do, fully loaded, towing etc. If it is not fully loaded and/or
towing, etc. you may or may not need that much pressure. The pressure and air volume carries the weight. the tire is the container of the pressure and volume. The manufacture of your specific tire could give you the actual air pressure to carry a specific weight. so you could actually weigh the vehicle see what it weighs, center it on the scale and see what the weight is that each axle is supporting, divide that by two and that would be the weight that hat each tire is carrying. you could look at the sidewall of the tire and see the max. load it will carry at the max air pressure recommended by that manufacture. OR!!!!! look at the door start there and adjust it till your truck works for you. MAKE YOUR TRUCK WORK FOR YOU, THE WAY YOU LOAD AND DRIVE IT!! And that is just basic stuff about air pressure, now ad load ranges, aspect ratios - 83 seriers,70 series 60's etc., tire design Flotation vs non flotation, sizes 6.50x13, A78-13, radial belts, non radial belting, belted non belted under the tread, rayon belts nylon belts, casing belts vs tread belts and on and on! Stickers on vehicles are required by Govt. agencies to feed the minimum amount of info to consumers to protect us from ourselves.