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Old 08-30-2015, 11:51 AM   #1
Jens Weber
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Question Inflation of tires on truck

I am slightly confused after having read about the cottect inflation of LT tires. The plachard on my F150 saya that the pressure should be 35 PSI, and other people say tht they shoul be inflated to the max (44 PSI) printed on the tire wall. Which should it be? Or should it be somewhere in between, dependant on load?
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Old 08-30-2015, 03:59 PM   #2
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At 44psi max. pressure ... are you sure they are LT tires???? You have to decide what payload you will be carrying and then adjust the pressure for that load as per the manufacturer. What size and brand tires are they????
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Old 08-30-2015, 05:02 PM   #3
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Quote:
Originally Posted by hankpage View Post
At 44psi max. pressure ... are you sure they are LT tires???? You have to decide what payload you will be carrying and then adjust the pressure for that load as per the manufacturer. What size and brand tires are they????
Sorry, the tires are not LT but P tires. They are. Michelin P265/60R 18.

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Old 08-30-2015, 05:34 PM   #4
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I would run them at what the decal says, for sure when towing. Check the pressure when cold...first thing in the morning.
Maybe experiment a little when not towing for a better ride if you want. But I wouldn't go any lower than 30psi.
These are factory tires, or factory spec, right?
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Old 08-30-2015, 06:21 PM   #5
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Right. The truck is only 4 months old and I have done no modifications on it
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Old 08-30-2015, 06:41 PM   #6
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Quote:
Originally Posted by Jens Weber View Post
Sorry, the tires are not LT but P tires. They are. Michelin P265/60R 18.

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That is what I thought ..... If it were my truck, I would air up the tires to max. pressure, hitch up and hit a scale fully loaded. Once you see what kind of weights you are carrying you can always air down if needed, but I have a feeling you may want to run the tires on the hard side to lessen sway from the soft side-walls of the P tires. JM2˘, Hank
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Old 08-30-2015, 06:45 PM   #7
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Run them at the pressure on the sidewall. The load does not matter. That will give the minimal amount of rubber on the road and minimal heat to the tires.
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Old 08-30-2015, 09:38 PM   #8
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Thank you guys for the info - some say one thing, and some says another. Since my trailer is small and fairly light weight, I guess I'll start out somewhere in the middle and after having been at the scales, try to figure out where to go.
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Old 08-31-2015, 03:22 AM   #9
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Personally I check the contact patch, I want even contact across the tread for best control and wear. If you have too much air they will contact heavy in the center, this will cause the load to be distributed heavy on less area of rubber and the tires will wear quickly. Same situation if you don't have enough air, but it'll wear the outside of the tire. The amount of rubber you have in contact with the road is very small, maximize it with the correct tire pressure to provide the best amount of control. Also, distributing the load across the entire face of the tread will give you the least amount of heat build up. My current tires have 80k miles on them and I still have 7/32 left
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Old 08-31-2015, 04:53 AM   #10
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I have P tires on my SUV. I keep them at the placard pressure of 32 psi ordinarily, but inflate them to 50 psi when towing (55 psi is max). If I'm planning any day trips while camping, I deflate them, then use my 12 V pump before heading home. It will jar your fillings loose unloaded at 50 psi because the ride already has pretty stiff suspension.
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Old 08-31-2015, 05:41 AM   #11
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When I had a 150 the door said 35psi and the tires said 35 psi so that was easy. When I was looking to replace the tires I asked the dealer about 44psi and 50 psi tires and he said no matter what I put on the truck if the door said 35 then I needed to run the tires at 35. I ended up trading the truck before spending the money on tires.
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Old 08-31-2015, 06:25 AM   #12
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Gary, I'm afraid your dealer and I have a completely different opinion on that question. If you have tires that read 50 PSI I simply cannot imagine a scenario where I would run 35 in them.
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Old 08-31-2015, 06:28 AM   #13
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I have a 2 month old F150, my trailer weighs about 7000lbs when loaded. Yes the door says 35psi, but when I am towing I put the pressures up to 40psi. I find 35 is too soft. Once I am running down the road they usually get up to about 44psi. That's is what seams to work for me.


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Old 08-31-2015, 12:37 PM   #14
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Your owner's manual may have information on tire inflation for heavy loads or when towing something.

Remember, your tires maximum load listed on the sidewall must be divided by 1.1 for it's true value when being used on your truck.
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Old 08-31-2015, 06:32 PM   #15
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Gary, I'm afraid your dealer and I have a completely different opinion on that question. If you have tires that read 50 PSI I simply cannot imagine a scenario where I would run 35 in them.
I would tend to agree with you but this was a good size dealer in eastern Mass. Upgrading from a 150 to a 350 did the trick so I did not have to worry about it.
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Old 08-31-2015, 06:58 PM   #16
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Personally I check the contact patch, I want even contact across the tread for best control and wear. If you have too much air they will contact heavy in the center, this will cause the load to be distributed heavy on less area of rubber and the tires will wear quickly. Same situation if you don't have enough air, but it'll wear the outside of the tire. The amount of rubber you have in contact with the road is very small, maximize it with the correct tire pressure to provide the best amount of control. Also, distributing the load across the entire face of the tread will give you the least amount of heat build up. My current tires have 80k miles on them and I still have 7/32 left
^^^That^^^

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Old 08-31-2015, 07:06 PM   #17
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I 100% agree with post #9 and will add. Get a 12v plug in air pump, adjust tires when needed. You may find less than max. in the front tires may work best. Another point about max tire psi in empty pickups. If/when your tire tread is only partly in contact with the road, as in having only the center part of tread in contact at max. psi your braking distance will be more than with the full tread on the road. Maybe for some it will never matter, in police vehicles driven code-3 it does matter and matters alot. For correct steering and braking the full tread needs to be in contact with the road. I adjust my own vehicles psi for the same reason.
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Old 09-01-2015, 11:14 AM   #18
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I'll check the manual
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Old 09-02-2015, 07:08 AM   #19
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When towing you will best be served running at max sidewall pressure IMO. When not towing return to placard specs
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