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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 03-15-2006, 06:14 PM   #1 (permalink)
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Tire pressure for dually

Well since I am new here and new to the Superduty, here is my first stupid question... I have 235/85/16 tires, my tires from the dealer are at 60lbs, should they be higher than that? On the side of the tire it has a max load of so many pounds lbs (I forget), but the preassure was 80lbs cold. Should the outside tires in the rear be filled a little less since I am not towing anything right now? [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 03-15-2006, 06:35 PM   #2 (permalink)
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Re: Tire pressure for dually

As you can see by my sig, I don't own a dually. However I think running 60-80lbs isn't needed unless you're loaded. I run55lbs in the front and 50 in the back normally. I think you could probably run 45lbs in all 4 rear tires with out any problems and probably have a better ride. I would run more in the front because that is where most of the weight is on our trucks. Try 50-55lbs and see how your tire wear looks. From what I've read on here the dually seem to experience quicker front tire wear.
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Old 03-15-2006, 06:41 PM   #3 (permalink)
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Re: Tire pressure for dually

This is my second F-350 DRW and I keep 65 in the front always and 45 in the rear when not loaded, maximum psi rating on the sidewall in the rear when loaded... E load range. I have always had even wear but keep an eye on your tire wear and adjust accordingly.
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Old 03-15-2006, 06:45 PM   #4 (permalink)
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Re: Tire pressure for dually

Thanksfor the info!
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Old 03-15-2006, 06:50 PM   #5 (permalink)
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Re: Tire pressure for dually

I do have a dually, and I run with 45 psi in all the rear tires and 55 psi in the front tires. They wear very evenly at this pressure. But that is unloaded. The best way to determine your inflation pressure is to use the manufacturers inflation table for your tires. It is the same regardless of manufacturer but is specific to your tire size and the load rating of the tires. Download the table here. Look at page 82. Take your truck to the local CAT scale and weigh it empty. Weigh it with your trailer (if you are towing) and adjust the inflation pressure according to the table.
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Old 03-15-2006, 08:27 PM   #6 (permalink)
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Re: Tire pressure for dually

[ QUOTE ]
I have 235/85/16 tires, my tires from the dealer are at 60lbs, should they be higher than that?

[/ QUOTE ]

No. Lower than that unless you are overloaded.

Using the table haul-n' noted, When unloaded you need about 50 front and 35 rear.

Here's the load/inflation table for LT235/85R16 tires:

<font class="small">Code:</font><hr /><pre>

PSI Max load on each tire
-----------------
Dual Single
----- ------
35 1585 1740
45 1805 1985
50 2006 2205
60 2205 2425
65 2381 2623
75 2580 2845
80 2778 3042
</pre><hr />

When you weigh your truck, unloaded or lightly loaded, it might weigh 4,400 on the front axle and 4,000 on the rear axle. So 2,200 pounds on each front tire and 1,000 pounds on each rear tire.

So you'd need 50 PSI in the front (single) tires. The rear (dual) tires aren't even loaded enough to be on the chart yet, so pump them up to the minimum of 35 PSI.

In fact, those rear duals can haul 6,340 pounds on the rear axle before you'd need more than 35 PSI. And when your rear axle is grossing 6,340, your front axle will be about 4,800. So you can load'er down to around 11,000 pounds GVW before you need to add more than 35 PSI to the rear tires. Of course, you'll need to pump the front tires up to about 60 PSI when you're grossing 11,000.
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Old 03-15-2006, 09:12 PM   #7 (permalink)
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Re: Tire pressure for dually

Wow. It is a pretty involved process for just putting air in the tires. Thanks Hualin horses for the table. Just can't find info like this easily. You guys helped me alot. Thanks
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Old 03-15-2006, 10:19 PM   #8 (permalink)
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Re: Tire pressure for dually

I don't think being grossed out at 11,000lbs and running 35psi of air in the rear tires is a very safe combination at all. Sure it will ride smooth but it ain't gonna handle worth a darn. What about sidewall flex, rearend sway and heat buildup in the tires due to the low air pressure?
I'll throw my nickels worth in here. About 60% of the miles on my truck are loaded heavy pulling a trailer. 100% of the miles it is always carrying something of a load due to an aux fuel tank and fuel, two toolboxes, tools, spare parts, safety equipment and three different hitches. I carry about 1,000 to 1,200lbs of "stuff" in the bed 100% of the time. Plus in the cab of the truck a cooler full of drinks, extra drinks, some food,clothes and whatever I need to run while I'm gone for a week or so.
I run 75psi in the steers and 70psi in the drives....all the time empty or loaded. Yeah it does ride a little rougher on bad roads but I get better fuel mileage, handling and tire wear at these pressures. I pulled the last set of tires off when they had 93,000 miles on them and put 'em on another truck to finish them out.
Granted my situation is probably different than yours but I just can't see running 35psi in the rear tires anytime, even empty.
Using the "chalk method" is a good way to figure out how much pressure you need to get good wear.
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Old 03-16-2006, 07:33 AM   #9 (permalink)
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Re: Tire pressure for dually

[ QUOTE ]
Well since I am new here and new to the Superduty, here is my first stupid question... I have 235/85/16 tires, my tires from the dealer are at 60lbs, should they be higher than that? On the side of the tire it has a max load of so many pounds lbs (I forget), but the preassure was 80lbs cold. Should the outside tires in the rear be filled a little less since I am not towing anything right now? [img]/ubbthreads/images/graemlins/shrug.gif[/img]

[/ QUOTE ]Take a look at this thread. I had aired up to 65 psi front and 60 psi rear for a heavy load and was still adequately inflated at those pressures.
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Old 03-16-2006, 07:51 AM   #10 (permalink)
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Re: Tire pressure for dually

Fast,
Is dead on the money! If you keep that much pressure in the rear with no load you will wear the centers of your tires out.
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Old 03-16-2006, 05:18 PM   #11 (permalink)
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Re: Tire pressure for dually

the pressures i run on my dually is 70 in the front as well as the rears.......granted the truck will ride a little harder but its a truck not a caddy.......plus i also tow more than the average bear and haul stuff in the bed on a weekly basis so im not the typical guy but i have always been told 60psi is fine unloaded, one factor to take into account i ran these same pressures on the factory garbage general tires and wore the middle of the tires out faster due to the balloon effect........michelin ltx's are built much better and dont balloon like the generals did........lots of factors to consider and how you use yuour truck etc........if you run lower pressures your mileage could possibly suffer as well
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Old 03-16-2006, 06:08 PM   #12 (permalink)
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Re: Tire pressure for dually

I feel that I must make a comment here. Ford puts a sticker on every vehicle it produces recommending a tire pressure. In this case it is 60 psi cold, all the way around. That is why the dealer set them that way. Check the door jamb on the left side, it has other info on it too. (VIN, GVWR, paint code, etc...)

I hate filling the tires when it is time to tow the trailer, cause I am usually in a rush to get going. So I keep mine @ 70-75 psi. It handles well, and if I wanted a smooth ride I would have bought a Lincoln Town car.

Low tire pressure can cause overheating and blowouts, not to mention ill handling.
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