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Old 10-19-2015, 09:55 PM   #1
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Tire Pressure thoughts/recommendations

I would like to get some thoughts on whether my line of thinking on tire pressures for my truck is right.

I have a 2015 Ford F-150 with a GVWR of 7000lbs, Front Axle 3450lbs, Rear Axle 3800lbs. The truck has Goodyear Wrangler Fortitude HT 275/65R18 116T tires with a max load rating of 2756lbs at a max 51PSI. The recommended pressure is 35PSI front and back.

When the truck is loaded and the trailer is hooked up the front axle weighs 3100lbs and the back axle is 3198lbs for a total of 6280lbs.

I could not find a load/pressure chart for these tires but I found a generic chart. If I read it right these tires should handle 2115lbs at the recommended 35PSI. That would be 4230lbs per axle or 8460lbs for the truck.

If I am looking at this right then I should never have to run more than 35PSI in the tires even when I am towing the trailer.

I had been towing with the tires at 50PSI but the truck beats us up on bumpy roads so I would prefer to use the recommended 35PSI. Also, at 51PSI that gives 11,024lbs which is way over kill.

Is my line of thinking on tire pressure for towing right or am I completely off base? It seems to me that the recommended 35PSI would be more than enough for the weights I am dealing with.
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Old 10-19-2015, 10:22 PM   #2
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It has been my experience that when towing, the tires should be inflated to their posted maximum.

Others may have other opinions.

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Old 10-19-2015, 10:35 PM   #3
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I run with 35 psi on a 2014 F150 STX pulling a 2012 25RKS Jayflight.
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Old 10-19-2015, 11:36 PM   #4
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Don't have a Ford, nor those tires. But I replaced my tires last year. Prior to the tire change, I ran at 35 psi, all the time, the combo handled really nicely. Changed tires, and I did not like how it handled. Change the tire pressure, in my case, increased them, until I found a good ride with the trailer. During the summer, I maintain the higher pressure, the ride is a bit more stiff. During the winter, I lower the pressure, to improve the ride.
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Old 10-20-2015, 07:12 AM   #5
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I wouldn't run the base 35lbs while towing. I would suggest at least 40 if not 45. If 50 is too much then try lessening 5lbs at a time. I suspect you'll be happy with 40-45.

I run 50psi unloaded in my truck and 60 when towing - I upgraded to load range E LT tires. My truck originally came with P rated tires recommended at 35psi. That was a joke and those tires were removed and sold immediately.

My dad's truck (same as mine) came with load range C LT tires and his door sticker says to run them at 40psi.
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Old 10-20-2015, 07:56 AM   #6
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My trailer is not as big or heavy as yours. However I run 45 in my rear tires and 35 in the front. I tried more on the front but I find the steering to be a bit squirrelly if it has much more than 35.
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Old 10-20-2015, 09:50 AM   #7
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I have also been thinking of trying 40-45lbs in the rear and keeping the front at 35lbs. I know when I had the front at 50lbs the front tires seemed to bounce and want to skip across the payment whenever you hit a hole or ridge in the road. Have the backs at 50PSI would jar the entire truck when you hit a hole, very uncomfortable ride. I have also written Goodyear with all of my technical information to see what their professional recommendations are for these tires. I would think that running a little more air, especially in the rear tires, while towing would help the tires wear better and give less sidewall flex for better handling.

We shall see what Goodyear says.

Thanks for all of the responses.
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Old 10-20-2015, 10:04 AM   #8
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I have a GMC D/A combo and the suggested tire pressures are 60 in the front and 70 in the back. That's what I have done since buying the truck and, while the ride is a little rough around town and on bumpy roads, it's fine pulling the FW and rides almost as nicely as our car on the highway when empty. After all, it's an HD, not a Cadillac.
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Old 10-20-2015, 10:20 AM   #9
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When towing I run my LTX MS2's on my F150 at 41 psi all the way around. 5 or 6 psi does not sound like a lot, but remember that it is about 17% of the recommended 35psi. I find that it does stiffen up the ride a little which is preferable for towing. I wish our TPMS measured temperature so I could see if there is any appreciable temp difference at different inflations.
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Old 10-20-2015, 11:57 AM   #10
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Quote:
Originally Posted by Golds View Post
I have also been thinking of trying 40-45lbs in the rear and keeping the front at 35lbs..
That is were I started at, and after a few trips, my fronts ended up at 42 psi, and the rear at 45.
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