Just got my truck in Dec and have been using it around the farm and pulled my stock trailer a few times. I'm getting ready to take it on a spring break road trip and was wondering what the best air pressure to run the tires at. It is a F250 supercab 4x4 with the stock 17" Pirelli Scorpins on it.
TIA

 

what engine?

 

Sorry I forgot to put that. It is the 5.4 so the weight isn't as heavy up front as the diesel.

 

What does your door sticker say?

 

Whatever is posted on the drivers post sticker. See an example from my truck . . .

 

Thanks I'll look there. I just plain forgot to look there. Sometimes I overlook the simple answers

 

Enjoy your spring break trip. Drop us some rep points too . . .

 

The stock answer is to check the pressure label on the door jamb, but this label is assuming factory tires and a truck loaded to the GAWR’s (Gross Axle Weight Rating). If you are operating at a lower weight, you can reduce the pressure for better tire wear, smoother ride and better traction.

Here’s the proper way to determine what pressure to run in your tires. Weigh your truck, getting individual weights for each wheel (or at a minimum each axle). Then consult the tire inflation chart for your brand/model of tire. You can view a chart at: http://www.trucktires.com/bridgeston...V_Brochure.pdf . The chart will tell you what pressure to run based on your weight. If you got individual wheel weights, use the heaviest wheel on an axle to determine what pressure to run on all tires on that axle. If you weigh your truck unloaded you’ll need to do this again with your normal load. If your load fluctuates all the time, it’s probably easier to just keep the tires inflated to handle the highest load you anticipate.

In my case, I carry a 4000 lb slide-in camper occasionally. I keep the truck tires inflated for unloaded driving most of the time. Then before I load the camper, I pump them up for the extra weight. That way the truck rides smoothly with good traction and even tread wear while unloaded. If I was loading and unloading the camper daily or even weekly, I’d probably just keep the tires pumped up. Changing tire pressure daily on a dually would get old real quick.
It's a good idea to read the footnotes and fine print in tire inflation manuals also. For instance, in the Firestone manual it says that if you are driving for long periods at 65 to 74 mph , you should increase the tire pressure 10 psi (provided the wheels are rated to handle the pressure). In the case of the Firestone Steeltex 265/75-16 tire that would be 90 psi. This means that the 80 psi listed on the sidewall is not the max pressure. If you want to drive 75 to 84 mph , you still need those extra 10 psi, but you also need to reduce you max weight capacity by 10%.

 

55-60 lbs will probably work fine but his ^^^^^ answer is best.