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Old 09-06-2005, 07:30 PM   #1 (permalink)
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Tire Pressure for Towing

285 / 75 / 16 BF Goodrich AT's on my '02 PSD crew cab 4x4. Will be towing a 16' tandem axle flatbed trailer and vehicle on it totaling 5000 pounds give or take a few lbs. What's the proper tire pressure I should be running while towing? Thanks for helping a newb out!
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Old 09-06-2005, 08:43 PM   #2 (permalink)
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Re: Tire Pressure for Towing

When towing you should run the maximum pressure on the tire sidewall. Others please correct me if I'm wrong, but I believe load range "E" tires are 80 PSI and load range "D" are 65 PSI.
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Old 09-06-2005, 09:07 PM   #3 (permalink)
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Re: Tire Pressure for Towing

I always run max on mine when towing, same tires, no problems. The way I see it, what can it hurt?
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Old 09-07-2005, 08:31 AM   #4 (permalink)
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Re: Tire Pressure for Towing

Thanks, I appreciate the help.
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Old 09-07-2005, 09:18 AM   #5 (permalink)
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Re: Tire Pressure for Towing

[ QUOTE ]
When towing you should run the maximum pressure on the tire sidewall. Others please correct me if I'm wrong, but I believe load range "E" tires are 80 PSI and load range "D" are 65 PSI.

[/ QUOTE ]

Not necessarily. There have been posts by Smokey that show tables for tire pressures based on weights.
Or you can go to some of the tire manufactures websites and look for load/inflation tables.
In order to get the pressure correct, you have to know your individual axle weights.
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Old 09-07-2005, 09:37 AM   #6 (permalink)
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Re: Tire Pressure for Towing

[ QUOTE ]
What's the proper tire pressure I should be running while towing?

[/ QUOTE ]

First you need to know the weight on the front and rear pickup axles when on the road with the trailer. Any big truck stop with a certified automated truck (CAT) scale will give you those weights for less than $10.

Here's an example that might fit your rig:

Front axle = 4,440 pounds, or 2,220 pounds on each front tire.

Rear axle = 5,480 or 2,740 pounds on each rear tire of an SRW pickup

Load inflation table for 285/75R16 tires:

PSI Load
--- ----
35 1910
40 2100
45 2280
50 2470
55 2625
60 2790
65 3000

So for that example, 2,220 pounds on each of our front tires requires 45 PSI. 2,740 on each rear tire requires 60 PSI. So for that load with those 285 tires, you should run 45 front and 60 rear.

But there's fine print to the load/inflation table. If you drive more than 70 MPH when towing, then add 10 PSI to each tire (up to the max PSI on the sidewall). So if you're dumb enough to tow at more than 70 MPH, then your tire pressures should be 55 front and 65 rear. (65 is the max pressure on your sidewall.)

All tire manufacturer's have the same load/inflation table - published by the Tire and Rim Assn. So one manufacturer's table is good for all brands of tires. Here's the Goodyear version: http://www.goodyear.com/truck/pdf/LoadInflLTMetric.pdf
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Old 09-07-2005, 11:32 AM   #7 (permalink)
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Re: Tire Pressure for Towing

I am towing a 13,000 lb 5er. My tires are E rated. I set my rears at 80 PSI cold and my fronts at 70 PSI cold when towing. When I am not towing I run 55 PSI rear and 50 PSI front. Seems to work fine.
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Old 09-07-2005, 11:48 AM   #8 (permalink)
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Re: Tire Pressure for Towing

[ QUOTE ]
I am towing a 13,000 lb 5er. My tires are E rated. I set my rears at 80 PSI cold and my fronts at 70 PSI cold when towing. When I am not towing I run 55 PSI rear and 50 PSI front. Seems to work fine.

[/ QUOTE ]Why more in the rear than the front when unloaded? There is more weight on the front axle unloaded. Hence the reason Ford specifies a higher pressure up front than behind.
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Old 09-07-2005, 05:36 PM   #9 (permalink)
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Re: Tire Pressure for Towing

What Smokey said. I have 50K on my original tires, and they are 50% worn as checked at a tire store. My tires have never saw anything near 80lbs. I have a GVW of 9900lbs when towing and have never had a problem. I run 65 in both front and rear when towing and lighten up when empty. Over pressure causes a harsher ride and make the tires more prone to damage from objects on the road.

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Old 09-07-2005, 06:01 PM   #10 (permalink)
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Re: Tire Pressure for Towing

Well I aired mine up to 65 front and 60 rear based on the inflation tables I was just barely adequately inflated for the 18K# of horses and trailer based on the CAT scales. [img]/ubbthreads/images/graemlins/eek.gif[/img]
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Old 09-07-2005, 09:22 PM   #11 (permalink)
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Re: Tire Pressure for Towing

65 up front loaded or empty (handles better)
40 in the rear empty, 80-85 loaded (depending on load)

The pressure on the sidewall is COLD pressure that's early in the morning before the sun hits them (or the tire hits the highway), after that when loaded they go up substantially. A 265/75E16 will run at 90-100PSI fully loaded in the summer at highway speeds this is the operating pressure of the tire. I have, and continue to inflate over the max PSI on the sidewall if I know I'll be overloaded or if I'm checking pressures at any time other than early dawn.

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Old 09-08-2005, 10:21 AM   #12 (permalink)
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Re: Tire Pressure for Towing

[ QUOTE ]
285 / 75 / 16 BF Goodrich AT's on my '02 PSD crew cab 4x4. Will be towing a 16' tandem axle flatbed trailer and vehicle on it totaling 5000 pounds give or take a few lbs. What's the proper tire pressure I should be running while towing? Thanks for helping a newb out!

[/ QUOTE ]

Hi, this sounds exactly like my set up, sig truck plus, a 16' tandem axle trailer with my 5000 lbs jeep, total pulling weight 7500 lbs, about 750 lbs tongue weight. I run 55 PSI front and 52 PSI rear on my BFG a/t 285-75-16 with a good tire thread contact, GCW at 15200 lbs.
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Old 09-09-2005, 12:10 AM   #13 (permalink)
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Re: Tire Pressure for Towing

[ QUOTE ]
[ QUOTE ]
I am towing a 13,000 lb 5er. My tires are E rated. I set my rears at 80 PSI cold and my fronts at 70 PSI cold when towing. When I am not towing I run 55 PSI rear and 50 PSI front. Seems to work fine.

[/ QUOTE ]Why more in the rear than the front when unloaded? There is more weight on the front axle unloaded. Hence the reason Ford specifies a higher pressure up front than behind.

[/ QUOTE ]

Correction.... 55 front / 50 rear unloaded.
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