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Old 07-08-2014, 10:00 AM   #1
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PSI question

I had the dreaded blowout on the 30 bunkhouse, ripped up the belly pan and side panel. Moving to an LT 16"... This is probably posted somewhere, but what PSI is the general consensus? The d rated old shoes were 65psi, e's are obviously rated for 80psi.... Does 70 sound like a good number? We run the bunkhouse in the 7800 lbs range at the axels.

They are going to pre fill the tires with nitrogen and I want to give them a PSI number, any suggestions?


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Old 07-08-2014, 10:06 AM   #2
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If your old tires were 225/75-15s like mine the LT 16s at 75 psi have about the same load carrying capacity. That's where I run mine, but I only have about 500 miles on them. Some on here run theirs lower to soften the ride but I chose to set for the same load carrying capacity. You can always let air out. :-)

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Old 07-08-2014, 11:24 AM   #3
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Go to the scales and weigh your trailer as it is loaded for the road then look at the inflation chart to determine the proper pressure.

http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

Please disregard the fact that I have posted a Goodyear chart. The Government require a standard for each tire by size.
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Old 07-08-2014, 12:00 PM   #4
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The Airstream recommended psi on the Michelin LT225/75R16/E LTX M/S2 tires they install on the Eddie Bauer trailers or retrofit to customer trailers is 80 psi which is the maximum number on the tire sidewall (2,680 pounds at 80psi). These tires and the SenDel T03-66655T aluminum wheels (rated 3,580 pounds at 80psi) are also installed on the 2015 31' Classic.

Only after a careful analysis across the scales (fully loaded for camping) by wheel location will you know what the heaviest load is on any one wheel and adjust tire pressure for that maximum weight.
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Old 07-08-2014, 01:12 PM   #5
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I put the 16" Michelins on last year before a winter trip to Arizona. Very happy with them so far. I have mine set at 75psi (10,000gvw Classic 30). I visually check the tires every time we stop, and also use a tpms and centramatics.

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Old 07-08-2014, 01:26 PM   #6
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Hmmm...
When you go from 65 psi 15" to 16" do you get a new tire placard?


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Old 07-08-2014, 02:19 PM   #7
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Re: tire placard

I understood that when tires were changed it was a DOT requirement that 1. The new tires should be inflated to a pressure that would give them the same load carrying capacity as the original tires at their recommended inflation pressure and, 2. A new placard should be installed listing the new tire size and the recommended pressure.

Since I took delivery of the tires and installed them myself I asked for a placard and Discount Tire gave me a couple. They apparently install them routinely when they change tire sizes.

I have seen it recommended by several on here for owners to make their own decisions re: inflation pressure based on actual weights and applying some margin. While that may give the trailer a softer ride, I chose to follow what I understand DOT requirements to be (which is close to AS's policy with the same wheels and tires) as a hedge against any potential issues in case of an accident. I don't want to give an over-zealous personal injury attorney any opening to squeeze through.

If I see any detrimental signs on the trailer I may consider backing down.

Al
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Old 07-08-2014, 02:24 PM   #8
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Thanks guys, I am putting Bridgestone durvas R250- 225-75-16 on sendel S20's. Hopefully overkill, I currently have 75,000 miles on durvas r500's on the truck... Commercial tires all the way... I am going to tell them to put 80psi and adjust at the scales as needed.
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Old 07-08-2014, 02:39 PM   #9
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I run 60psi in mine, but I have six and by the numbers four would be plenty for my weight, so I've got a 50% safety factor right off the bat


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Old 07-17-2014, 09:27 AM   #10
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After having 3 ST225/75R15(E) tires fail in less than a 3-year period, I am switching to the Michelin LT with 16" wheels. This, together with replacement axles (moving from 4,000 lb to 4,500 lb ratings) and Centramatics is being done at JC next week. I did ask Chris about the rating plate and his answer was that it contained the date of manufacture, so it was not going to be changed. He said that the work-order is the statement of modification and should be kept.
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