I have ony hade my truck for a few weeks. I ckecked the tire pressure and they were all around 40-60psi. I went ahead and filled them up to the recomended 80psi. Wow, now I can feel every rock on the road! What do you run yours at? seems like 40-60psi could cause premature tire wear and loss of fuel milage.

What do ya think?
Chris

 

I run 45psi when empty.It make it ride mutch better.

 

I run 45 up front and 40 in the back with no load. When hauling a load however I bump them up to at least 65.

 

Hi guys! If you search the threads there are quite a few posts on air pressure. Some quite good.
Drive Safe.

 

The label on the door jamb is assuming a truck is 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 www.trucktires.com . 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 while at the rated max load for the tire, 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%.

You can view a tire inflation table for LT235/85-16 tires at www.trucktires.com .
Here’s the inflation table for the LT265/75R16 Firestone Steeltex tire

Weight Pressure
1910 35
2100 40
2280 45
2470 50
2625 55
2790 60
3000 65
3105 70
3260 75
3415 80

65-74mph add 10psi
75-84mph add 10psi & decrease load 10%



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2000 F350 CC DRW Lariat 4x4 LWB 4R100 V10 4.30ls with Torklift tie-downs/Superhitch and Rancho RS9000 and Ride-Rite air springs.
1998 Alpenlite Pendelton 11'10" Slide-in camper with all options.

 

WOW! Thanks for the great information!

Chris

 

I own a 97 F-250 heavy duty with Mastercraft Coursers on it and the place where I just got them brand new said to keep them at 50 psi. 60 psi would be for heavier loads but for everyday driving and comfort adjust to 50.