Tire Pressures?
More Turbo
Joined: Sep 2016
Posts: 618
Likes: 6
I run the OE recommended pressures - 65psi front 80psi rear all the time. Rides fine and the pressure is appropriate for the tires/axle ratings.
But we tow the 5th weekly.... The ride isn't terrible - I'd probably keep it at that anyway if only occasionally towing.
But we tow the 5th weekly.... The ride isn't terrible - I'd probably keep it at that anyway if only occasionally towing.
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Elder User
Joined: Jul 2016
Posts: 610
Likes: 0
From: Witness Protection Progam
Currently I'm running 70 all the way around. Think 65 up front and 80 in the back will be my next goal. Ok, here is the twist. I just pulled a full cargo trailer to San Antonio and all my tires were at 70 when cold. After some time on the Highway.... the TPMS said the tires were at some 80+ each after warming up. So, if I air up the back to 80ish, will they heat up and expand the pressures up to 90ish?
More Turbo
Joined: Sep 2016
Posts: 618
Likes: 6
Currently I'm running 70 all the way around. Think 65 up front and 80 in the back will be my next goal. Ok, here is the twist. I just pulled a full cargo trailer to San Antonio and all my tires were at 70 when cold. After some time on the Highway.... the TPMS said the tires were at some 80+ each after warming up. So, if I air up the back to 80ish, will they heat up and expand the pressures up to 90ish?
Yes I regularly see ~67psi front 86/87psi rear when towing heavy.
Stop questioning the manufacturers here - the tire pressure ratings are cold, so use them as such. Just like you use too, before every car had tpms.
Tires have been heating up under load since the day they were invented.
FTE Legend
Joined: Jul 2005
Posts: 65,938
Likes: 1,432
From: Millersville, MD
I always run 80 in the rear towing and normally. Actually I don't run the truck much empty anyway. Run 65 as prescribed by the b pillar sticker from Ford.
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Lead Driver
Joined: Jan 2002
Posts: 8,640
Likes: 4,727
From: Itinerant
The dually payload weight rating max is 6,300-6,900# depending configuration. Most of our 5th wheel pin wieghts are 3-4k+/- # range plus misc stuff carried in truck. Certainly doesn't hurt maxing tires at 80psi but figured 65-70psi works just as well.
The only thing that gets max psi is the 5th wheel axle tires because they are at near max weight.
The only thing that gets max psi is the 5th wheel axle tires because they are at near max weight.
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Rob
Hotshot
Joined: Jan 2010
Posts: 10,060
Likes: 491
From: Bristol, TN.
I know, I posted the table here in the past. I find the difference in ride quality when aired down to be a dramatic improvement over the sticker pressures on my F350 when running empty, which I do most of the time. The one thing I do find is my low tire pressure warning light on the dash is inconsistent. Sometimes it comes on, other times it stays off. I wonder how common that is. I found airing down to about 50 psi is fairly common practice among many owners when I searched the Internet.
Tuned
Joined: Jul 2003
Posts: 274
Likes: 20
Same for me. My truck beats me to death if I leave the tires up at 80 psi when I'm empty. I just get used to the "low tire pressure" light staying lit.
Posting Guru
Joined: Aug 2015
Posts: 2,399
Likes: 12
On an F450, the 90/80 on the door will cause an unladen truck to wander. I run 80/70 empty or towing.
Hotshot
Joined: Jan 2010
Posts: 10,060
Likes: 491
From: Bristol, TN.
Since I know my weights, I adjust my tire pressure according to my load or lack thereof using Michelin's tire pressure chart. I am either running near empty, with a fiver on the back, or a truck camper in the bed and I have my weights for each of those scenarios.