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Old 08-31-2015, 09:06 PM   #1
Arn
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LT Tire PSI

Just upgraded my old Ford to a new Silverado. It's the first vehicle I've owned with LT tires so bear with me. I know they are capable of 80psi but I don't want to roll down the road on rocks like Fred Flinstone since I really don't need them at max pressure. They came from the dealer with 38psi which I'm thinking might be a bit low for me. My travel trailer weighs 7,000lbs with a tongue weight of about 860lbs so I'm wondering if some of you tire geniuses can tell me what you run for psi. Thanks.
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Old 08-31-2015, 09:15 PM   #2
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I've always run tires at their max cold pressure rating stamped on the sidewall. Don't think the ride will be that much different and I think you'll get improved wear and milage with a higher pressure, but that's just me. I'll be interested to hear other ideas
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Old 08-31-2015, 09:15 PM   #3
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I run my Coopers at 80 PSI because I do not wish to spend the time airing them up and down.

No undue tire wear, yes it does ride like a truck not sure how that worked out.



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Old 08-31-2015, 09:29 PM   #4
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I would suggest that you run the tires at max air pressure when towing and air them down when not towing.

Now the best thing to do is weight the truck and trailer to find your rear axle weights. Then air the tires per the scaled weight to support the tire load which may be less then the 80 psi would support.

This is what I do when I run my towing tires durning the towing season. I have two sets of tires and rims, so I have winter tires and my summer towing tires. The towing tires are run at 70 psi rear which supports a load of 3415 lbs. my tires are LT285/70R/17 126R
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Old 09-01-2015, 12:04 AM   #5
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Read the recommended tire pressure that is posted on a sticker in the door jam, B pillar down low. This will give you a good starting point. See how it works for YOU, and adjust accordingly.
There's no other cut and dry answer. Most other answers will be based on someone else's experiences and opinions. You need to form your own to figure out what works best.
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Old 09-04-2015, 06:44 PM   #6
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My old Cummins Dodge I'd run 50 in the front and 35 in the rear when empty. That kept a nice even tread wear. Loaded they'd go to 80.
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Old 09-04-2015, 07:09 PM   #7
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When loaded mine go to max psi. Unloaded I run them at 40 psi.
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Old 09-07-2015, 11:16 AM   #8
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I just towed at 38psi & had no issues. We have a few more trips this season so I'll be packing my portable compressor & doing a lot of trial & error. Thanks all for the helpful info!
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Old 09-07-2015, 12:06 PM   #9
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38 is too low for an LRE LT tire at anything other than minimum weight. I run 65 front, 77 rear (cold) during towing season. I'll go to 55/70 in the off-season.
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Old 09-07-2015, 12:14 PM   #10
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Quote:
Originally Posted by DaveSchwartz View Post
38 is too low for an LRE LT tire at anything other than minimum weight. I run 65 front, 77 rear (cold) during towing season. I'll go to 55/70 in the off-season.

X2
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Old 09-07-2015, 12:37 PM   #11
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70 in the rear with an empty truck? Wow, that thing must ride like a stagecoach and wear the center of the tire quickly. 35 in the rear of my old Dodge empty and the tires wore dead even across the tread. 55 in the front with the Cummins and they wore perfect. I got 80k out of multiple sets of Michelin LTX tires. Definitely air up when loaded but empty you don't need to go crazy.
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