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Old 03-26-2014, 11:48 PM   #15
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80 psi on the placard for our Michelins on the EB upgrade wheels.
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Old 03-27-2014, 05:22 AM   #16
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80 psi on the placard for our Michelins on the EB upgrade wheels.
Mefly - what does your manual say about torque?
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Old 03-27-2014, 12:44 PM   #17
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Tire Pressure &Torque

Thanks for all the posts. As usual, I am amazed at the wealth of knowledge in the Airstream community. I called Jackson Center and they told me that they use 80# psi and torque at 125-45 for my new tire configuration. It looks like I am in the right ballpark.
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Old 03-27-2014, 01:09 PM   #18
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Thanks for all the posts. As usual, I am amazed at the wealth of knowledge in the Airstream community. I called Jackson Center and they told me that they use 80# psi and torque at 125-45 for my new tire configuration. It looks like I am in the right ballpark.
That torque value sounds high to me. In the 2014 Ed B owners manual ( page I-2 ), A/S specs 100 ft-lbs for steel wheels, 110 ft-lbs for aluminum wheels ( same for 15" or 16").

That matches all the charts I have hanging on the wall in my garage. But hey....what do I know ? ( not much, most of the time )

EDIT: google Airstream owners manual, they have them online as PDF's
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Old 03-27-2014, 01:23 PM   #19
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I just had Michelin XPS Rib LT225/75R16 tires installed on our 31' 2005 Classic along with 16" wheels. The tire dealer recommended 85 psi for tire pressure and a torque setting of 120. Does that seem right to other Michelin tire owners?
I have two conclusions and a question.

Conclusion first. You have good taste in tires insofar as you have chosen the most expensive tires available that will fit your trailer.

Conclusion second. You are exceeding the sidewall max pressure which is 80 PSI. Not a good thing. Indeed Michelin recommends around 50 PSI for your situation, see: http://www.rvtirepressure.com/assets..._Inflation.pdf

I'm assuming your trailer weighs around 8500 pounds with 800 pounds of tongue weight.

A question. How do those fit? Any tire rub against the wheel wells?
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Old 03-27-2014, 01:51 PM   #20
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Is This True?

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... Air is an interesting gas and expands and contracts quite a bit within the range of temps a tire experiences. This is why newer vehicles are using Nitrogen instead of air. It is much more stable with regards to expansion with temp...
In the temperature and pressure ranges that we are dealing with in this discussion, dry air and dry nitrogen will both behave pretty much as the Ideal Gas Law predicts. With the measuring equipment that we use to monitor our tires (TPMS and tire pressure gauge), it is unlikely that we would be able to measure any practical difference.
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Old 03-27-2014, 02:39 PM   #21
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In the temperature and pressure ranges that we are dealing with in this discussion, dry air and dry nitrogen will both behave pretty much as the Ideal Gas Law predicts. With the measuring equipment that we use to monitor our tires (TPMS and tire pressure gauge), it is unlikely that we would be able to measure any practical difference.
....aw come on Nick....you're cutting into that nice fat profit/gimmick that the tire stores are selling.....nitrogen and those really cool green valve caps....
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Old 03-27-2014, 03:58 PM   #22
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In the temperature and pressure ranges that we are dealing with in this discussion, dry air and dry nitrogen will both behave pretty much as the Ideal Gas Law predicts. With the measuring equipment that we use to monitor our tires (TPMS and tire pressure gauge), it is unlikely that we would be able to measure any practical difference.
Nick... My apologies. I was having a brain fart over here. Ideal gases expand at the same rate regardless of what type they are. Sorry it's been a while since I've had to do any physics. Nitrogen in the tires has to do with it not permeating the rubber. Not with expansion rates. Thank you for the correction. : )
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Old 03-27-2014, 06:09 PM   #23
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It's been my understanding through the years, several different trailers and tires and numerous discussions with tire "experts" that the "max" tire pressure on the tires is the pressure the tires need to be inflated to to carry the maximum load indicate on the tire. It's not the maximum safe pressure in the usual sense. Anyone that has followed tire pressures with the tire monitoring systems know that the actual running pressures range from 5 to 8 lbs on the road above the cold start temperatures at a constant air temperature. Depending on sunlight, rain, and other such odd features of travel. Heaven forbid that you see what the tire pressure is mid afternoon when you start out at a cold inflation at 30 or 40 degrees and have a max temp during your days drive of 80 deg or above. Even worse is if you start out a trip with a cold inflation pressure of X and a temperature of 20 deg and end up at mid trip with temperatures in the morning of 60 and rising to 90 during the day. You can spend every day bleeding off or adding pressure. I don't see many people doing that. So my comment would be pick a reasonable number such that when the temperature drops, you don't end way under a load capacity for the tires at the early morning temperature. For my new 16 in Michelin's, as well as my old 15 Load range E Maxxis, I've chosen 75. Rolling, that gets a driving pressure of around 82, give or take. As to nut torque, 100 to 110 seems about right based on numerous recommendations. Discount Tires recommendation was 100 lb but I think I'll go with 110 based on the aluminum rim discussion.
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Old 03-27-2014, 09:50 PM   #24
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I just had Michelin XPS Rib LT225/75R16 tires installed on our 31' 2005 Classic along with 16" wheels. The tire dealer recommended 85 psi for tire pressure and a torque setting of 120. Does that seem right to other Michelin tire owners?
If you want to follow industry standards for your new tires you should read the information on your trailerís tire placard. That information will give a recommended tire pressure for the OE tires. That pressure corresponds to the load capacity each tire needs - according to the vehicle manufacturer - to carry the loaded trailer. Now look at a load inflation chart for the new tires and use the pressure needed to match the load capacity of the OE tires. That is your new cold recommended tire pressure.

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Old 03-28-2014, 12:17 AM   #25
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Originally Posted by nickmeloy View Post
In the temperature and pressure ranges that we are dealing with in this discussion, dry air and dry nitrogen will both behave pretty much as the Ideal Gas Law predicts. With the measuring equipment that we use to monitor our tires (TPMS and tire pressure gauge), it is unlikely that we would be able to measure any practical difference.
How much of our "air" is actually Nitrogen ... 7/8 IIRC.
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Old 03-28-2014, 12:50 AM   #26
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pressure and torque

I've been running 70 psi and 110 ft lbs on my new Michelin 16" LTX MS/2 and Sendel wheels. I now have about 2000 mi and so far it seems right, tows right, hasn't gotten warm at all and the lug nuts are staying tight.
I'm a happy camper now.
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Old 03-28-2014, 05:32 AM   #27
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We've been towing for many years, 20+, and have found that trailer tires work best at 65lbs and 65mph. Just my 2 cents worth.
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Old 03-28-2014, 06:34 AM   #28
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I run 65 psi in my Good Year Marathons.
In my mind when I get 16" wheels and tires I will still run 65 psi.
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