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Old 10-10-2016, 07:55 PM   #1
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Tow Vehicle Tire Pressure

Hi:
I have a 2014 Ford F-150 as my towing vehicle. The recommended tire pressure is 35 PSI. I tow a 6000 lb. (when fully loaded) trailer. I have a anti-sway/weight distribution hitch.
My question is, should I increase the tire pressure in my truck when towing?

Thanks for your response.

Norm
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Old 10-10-2016, 10:15 PM   #2
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Are you going by your door sticker or max psi on your tires?
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Old 10-10-2016, 10:30 PM   #3
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I would max out the rear to the sidewall number. As for the fronts, that will depend on how it feels to you. I have d rated and felt light so I run 45 and have more road feel.


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Old 10-10-2016, 10:58 PM   #4
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Originally Posted by Seachaser186 View Post
Are you going by your door sticker or max psi on your tires?
The 35 psi is on the door sticker.
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Old 10-10-2016, 11:05 PM   #5
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Maxing the rear tires makes sense to me. Sould help with the additional load and help them run cool.
Thanks for your thoughts on this.
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Old 10-11-2016, 05:24 AM   #6
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If you use a weightdistribution hich like you do , weight on rear tires is distributed partly, to tires of trailer and front tires of tow vehicle.
But you must keep the rear tires at pressure , so when WDH is put loose so more weight on rear, must yust be enaugh to get no damage to tires in that case. When WDH is working then you have some reserve and better fuel saving.

the 35 psi advice is pressure needed for maximum load up to 99m/h for Standard load P-tires,wich you most likely have, so is probably given as standard , and not calculated for the real loads on the tires, yust so the carmaker is in the clear with all the responcibilitys. Real needed pressure , I am able to calculate for you and is , because of the expected oversised tires you have , much lower, mayby even as low as 30 psi in rear.

So putting more then 35 in rear is to my expectation not needed, even not when towing without WDH working.
Check data on tires and try to determine the real weights on tires when towing, and give those here, and I will calculate.
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Old 10-11-2016, 08:01 AM   #7
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Back to my original question. Look at the Max PSI on the tires and add air accordingly when towing to control tire roll. Normally I run 36 PSI and inflate to 46 PSI for towing, makes a big difference. My Max PSI is 54, I am running 116T 18' P-tires.
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Old 10-11-2016, 09:48 AM   #8
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Strange maximum cold pressure of last poster.
54 psi , is that correct .

For P tires in standard load , mostly 44 psi to 50 psi is given as max cold pressure.
But this is not for P-tires the same as for LT tires, those give maxloadpressure/reference-pressure/will call it further AT-pressure on sidewall,and is the pressure needed for the maximum load up to max speed of tire, or if lower 160km/99m/h.

P tires in Standard load give only maximum allowed cold pressure , max allowed by the tiremaker, and AT-pressure is lower.
SL/standard load P-tire AT 35 psi
XL/reinforced/Extraload P-tire AT 41 psi

For the tires its not bad to put higher pressure in , but for comfort and gripp lower pressure , so more deflection of tire, is better.
So front tires of towing vehicle benefit from using lower pressure ( but not to low) for better gripp, assuming most cars have frontwheeldrive( but TS car probably rearwheeldrive, i realise now), but also braking is most on front wheels .
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Old 10-11-2016, 10:34 AM   #9
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Quote:
Originally Posted by jadatis View Post
Strange maximum cold pressure of last poster.
54 psi , is that correct .

For P tires in standard load , mostly 44 psi to 50 psi is given as max cold pressure.
But this is not for P-tires the same as for LT tires, those give maxloadpressure/reference-pressure/will call it further AT-pressure on sidewall,and is the pressure needed for the maximum load up to max speed of tire, or if lower 160km/99m/h.

P tires in Standard load give only maximum allowed cold pressure , max allowed by the tiremaker, and AT-pressure is lower.
SL/standard load P-tire AT 35 psi
XL/reinforced/Extraload P-tire AT 41 psi

For the tires its not bad to put higher pressure in , but for comfort and gripp lower pressure , so more deflection of tire, is better.
So front tires of towing vehicle benefit from using lower pressure ( but not to low) for better gripp, assuming most cars have frontwheeldrive( but TS car probably rearwheeldrive, i realise now), but also braking is most on front wheels .
Yes 116T tires have 54 psi and have more load rating than some LT tires.
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Old 10-11-2016, 11:25 AM   #10
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Can you give here exact sises so I can google?
116T must mean , maximum load 1250kg/2756 lbs and because you write its a P-tire , it must be those AT-pressure I gave.
T stands for maximum speed of 190km/about 118m/H
But then maximum load is given still for 35 or 41(xl) psi and up to 160km/99m/h, and for higher speed the pressure needs to be highened up with a system depending on speedcode.
But not important here because speed will stay far below 99m/h.
So I expect them to be pretty large tires to give that high maximum load.
The LT tires you say have lower loadindex, must be smaller then.
A 225/75R16 tire in C-tire ( EUR equivalent of LT) I found also in 116 loadindex but then with 65 psi AT-pressure, so yours must be mayby 18 inch and wider.
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