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Old 03-11-2017, 08:33 AM   #1
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LT Tires - Tire Pressure?

For those of you with LT load range E tires, what PSI do you leave them at when unloaded, as well what do you air them up to when towing?

We tow about 8,000 lbs when our trailer is fully loaded so I'm curious where we should start. Thanks for any input! We are about to purchase tires to swap out our P tires and was curious.

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Old 03-11-2017, 10:36 AM   #2
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You talking for the rv or truck? On the rv I'd run whatever it says on the sidewall for max load, on the truck you'll have to experiment to find the comfortable ride & be able to handle the load. If you don't have tire pressure monitoring system I'd highly recommend one that shows pressure as well as temperature for truck & trailer as temperature is usually what causes blow outs & underinflation is what causes temperature to rise.
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Old 03-20-2017, 05:48 AM   #3
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My apologies, I meant for the truck. Any idea where we should start. The door jam says 35, but that seems awfully low for 10ply tires.
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Old 03-20-2017, 06:04 AM   #4
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I run mine at 60 PSI
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Old 03-20-2017, 06:52 AM   #5
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The only way to know (other than a starting point which should be high to be safe) is to weigh your fully loaded combo...
you can go to a Cat Scale for $10 or so -
that link even tells you how to do it

the Rear axle weight and RAWR will be your limiting factor I will bet...
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Old 03-20-2017, 10:00 AM   #6
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@johnboytoo - I'm confused, I'm curious on what PSI I should set my truck E-rated tires at when it's unloaded. I know the weights of my truck and trailer, but that really doesn't have a bearing on what I should set the PSI of the truck tires to.
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Old 03-20-2017, 10:30 AM   #7
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@johnboytoo - I'm confused, I'm curious on what PSI I should set my truck E-rated tires at when it's unloaded. I know the weights of my truck and trailer, but that really doesn't have a bearing on what I should set the PSI of the truck tires to.

This has been a long disputed topic.
Some say they leave them at 80 psi and never change.
I don't because I don't like the jarring ride when they are inflated to 80 psi.
When I have the 5er hooked on I don't run 80 psi then either. There isn't enough weight on the back axle of the truck to warrant that much pressure. My tire dealer fully agrees with that.
When empty I run 50 on the rear, and 55 on the front. That seems to take care of any belly in the sidewall, truck rides better, and in all my years of doing it this way I have never ruined a tire or had any issues.
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Old 03-20-2017, 02:59 PM   #8
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Are these the stock tires that came on the truck? if so, the placard is close...
BUT, that is the recommended pressure in case you have your truck loaded to the max GVWR.

So, as Lloyd said, the psi on the sidewall is the psi needed to support the max load carrying capacity of the tire...

IMHO, loaded with say a 3k pin wgt,
would require a different psi than unloaded...

If your tire says it will carry 3750 lbs, it will only carry it at the max psi.

BUT, as all tire load inflation tables show, less weight requires less psi to safely support that weight.

which gives you a byproduct of a better ride, etc...

what is the mfg, brand, model, size of your tires ? (it makes a difference )

the 22.5 tires on the monaco call for 115 psi, but after weighing it fully loaded and fueled up, the load tables show that 90 psi would carry the weight and give me a better ride.
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Old 03-20-2017, 03:33 PM   #9
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I do the same as Lloyd. Works for me
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Old 03-20-2017, 06:23 PM   #10
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My OE truck 10 ply "E" tires say to inflate to 65 per the door placard. I leave it there unless pulling trailer, then I max out to 80 psi as stated on the tire.
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Old 03-20-2017, 08:45 PM   #11
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I guess my problem is my F-150 came stock with P rated tires, and the door Jam says inflate to 35psi. However, I'd like to upgrade the tires to E-rated to get rid of the "squishy" feel I have on the road when towing, and curious as to what I should set the unloaded tire PSI to to allow a more comfortable ride that won't be so low that it will kill the tires or be unsafe.
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Old 03-20-2017, 09:39 PM   #12
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I run my stock 'E' tires at the pressure the placard says regardless if I'm towing or not, 60 PSI front and 70 PSI rear.
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Old 03-20-2017, 10:09 PM   #13
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Quote:
Originally Posted by NoodlesWIU View Post
I guess my problem is my F-150 came stock with P rated tires, and the door Jam says inflate to 35psi. However, I'd like to upgrade the tires to E-rated to get rid of the "squishy" feel I have on the road when towing, and curious as to what I should set the unloaded tire PSI to to allow a more comfortable ride that won't be so low that it will kill the tires or be unsafe.
Tim, I did the same thing when we had our F150 3.5. The ten ply made a big difference. I think I kept the psi at 50 when unloaded, and maxed out at 80 when loaded. We really liked those tires. We had Toyo Open Country, 20's. I will never have 20's again, it limits your purchasing options.
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Old 03-21-2017, 05:48 AM   #14
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Tim, I did the same thing when we had our F150 3.5. The ten ply made a big difference. I think I kept the psi at 50 when unloaded, and maxed out at 80 when loaded. We really liked those tires. We had Toyo Open Country, 20's. I will never have 20's again, it limits your purchasing options.

Not only do 20" tires limit your choices but they double the cost of the tires.
I have 20" on my F250 and just ordered new tires. $1.161.00 plus tax. Ouch!
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Old 03-21-2017, 11:57 AM   #15
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Not only do 20" tires limit your choices but they double the cost of the tires.
I have 20" on my F250 and just ordered new tires. $1.161.00 plus tax. Ouch!
I think I paid more than that for our four, somewhere around $1,500. Yes, they are expensive. Glad I have 18" now!
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Old 03-22-2017, 06:12 AM   #16
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I guess my problem is my F-150 came stock with P rated tires, and the door Jam says inflate to 35psi. However, I'd like to upgrade the tires to E-rated to get rid of the "squishy" feel I have on the road when towing, and curious as to what I should set the unloaded tire PSI to to allow a more comfortable ride that won't be so low that it will kill the tires or be unsafe.
I run 45 psi unloaded and 60 when towing season hits. There was a noticeable difference when I went from P tires to LT tires on the truck.
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Old 03-22-2017, 12:27 PM   #17
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We have ours set at 60 in the front and 80 in the rear (per the door sticker) when towing and take the rear down to 60 when not towing to soften the ride.
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Old 03-26-2017, 09:52 AM   #18
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Placard on my E-350 van says 55 front 80 rear. If I'm not towing, I'll back them down to 65-70 if I don't have much cargo.
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Old 03-27-2017, 06:43 PM   #19
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Just bought 4 Michelin Defender LTX/MS today and had them installed from Tire Rack. I asked the question on psi and he went to some handy dandy secret book they have and said 55 psi for those tires on my specific vehicle. They even printed a new tire and loading sticker they stuck on the inside of my door jam. I asked about loaded with an 8,000 lb trailer and gentleman didn't even bat an eye saying run the front at 60, and rear at 70-80 depending on your comfort level. I picked them up And had them installed at their South Bend IN location. Being that is only 15-20 miles from the Elkhart RV capital of 80% of where most trailers are manufactured, it sounds like they get that question a lot.
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Old 03-28-2017, 05:13 AM   #20
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I have run Goodyear Wranglers with the Kevlar for a few yeas now, and like the overall performance the tire gives me. Usually inflate to 45psi unloaded and 65 psi when towing (cold tire pressure), it's the sweet spot for my set up. I've tried heavier inflation and did not find it necessary, for me personally. A LT tire will make a huge difference for you!
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