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Old 08-20-2018, 09:10 AM   #1
leemedic
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Tire Pressure on Tow Vehicle

I search the forum, and did not find the answer I was looking for.

I have a Ford F350 dually.

The placard on the door says to inflate to 60 psi.

I have Michelin tires and the sidewalls permit psi up to 80 psi.

With the weight we are towing, should I increase the psi in my tow vehicle?

If I just asked a stupid question, feel free to slap me online, if you are going to the 2018 rally, you can slap me there!
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Old 08-20-2018, 09:50 AM   #2
DQDick
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On my Dodge SRW I run them close to the max.
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Old 08-20-2018, 09:55 AM   #3
mlh
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60 pounds in your tires is just fine. Single wheel trucks probably need the 80 pounds listed on the tires but your duel wheels don’t need that much pressure.
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Old 08-20-2018, 12:02 PM   #4
STIHLNTIME
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I run my Michelin's at 80 psi on the rear and 72 psi on the front while towing. During periods while we will not be using the Montana run them at 60 psi all the way around.
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Old 08-20-2018, 12:28 PM   #5
Kyle and Lisa
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2017 F-350 dually, door sticker says 70 front 65 back cold. We pull a 3790RD 40' rig, 11 months full time moving every other week and traveling 2-300 miles at a time, we have had no abnormal wear. Once on the road, tires come up 5-8 psi front and rear. Rig psi 110 cold and once on the road they come up about 10 psi with no abnormal wear.
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Old 08-20-2018, 01:50 PM   #6
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80 all around. Yes, hard ride.
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Old 08-21-2018, 08:03 AM   #7
bethandkevin
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That sticker has the factory pressures for factory supplied tires. It's not there to inform of the best inflation for comfort, it's for maximum load rating. If the original tires were the same model Michelins, the sticker would still apply. If not, it doesn't. No need to put more thought than is needed into this equation: Go by what is on the tire sidewall. It will have both dual and single max tire inflation and load ratings. If you go by the truck sticker and you're wrong you could have a problem. If you go by the tire label, you certainly won't hurt the truck.
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Old 08-21-2018, 09:57 AM   #8
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Quote:
Originally Posted by bethandkevin View Post
That sticker has the factory pressures for factory supplied tires. It's not there to inform of the best inflation for comfort, it's for maximum load rating. If the original tires were the same model Michelins, the sticker would still apply. If not, it doesn't. No need to put more thought than is needed into this equation: Go by what is on the tire sidewall. It will have both dual and single max tire inflation and load ratings. If you go by the truck sticker and you're wrong you could have a problem. If you go by the tire label, you certainly won't hurt the truck.
Thanks, kind of what I was thinking.
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Old 08-21-2018, 10:31 AM   #9
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On our 2012 F350 Dually we keep the pressure as directed on the door and got 64,000 out of the first set of tires with even wear, in 2017 we traded the truck at 107,000 with second set of six good condition tires. Here on the farm we temporarily put in higher pressure when moving very heavy loads. The recommendations on the door are most likely based on best-practices for general use.
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Old 08-21-2018, 11:34 PM   #10
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I think my old truck had a rear axle weight of something like 6080. It was exactly the limit on the two tires on the axle! I think I had to run 80# in them too.
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Old 08-27-2018, 02:32 AM   #11
Overlord
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Find the "Load & Inflation Tables" for your particular brand, model, rating, and size of tire.

It will tell you exactly how many PSI that you need for the amount of weight supported by each tire. I keep a copy of mine in the truck.

Where I live, you can use the states roadside commercial truck scales to weigh your rig for free when they are closed, and at least a couple times a year I will weigh the truck and 5er when fully loaded. Then, whenever we go on a trip, I already know the weights and I can adjust the tire pressures to what they need to be.

For the truck, I adjust the PSI to whichever tire (left or right) has the heaviest load to the same pressure in both tires for that axle. The front and rear axles will have different pressures, but tires on the same axle should be set to the same PSI.

On the 5er, I weigh each tire on its own, find the correct PSI, and then set all four tires at the same pressure to that of the heaviest individual tire load.
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Old 09-02-2018, 02:38 PM   #12
sdetweil
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80psi in the rear on a dually is like riding on square wheels...

my dually says 60 on the door placard for MAX load (9000 lbs rear axle).. and I am not even close to that. i run 72/60.

on the scales the rear axle was less than 7000 with the trailer
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