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Old 10-20-2013, 04:02 AM   #71
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Visit the parts manual for your trailer at the Airstream web site. Label not withstanding on the trailer, there is only one axle model for both 25 and 27/28 models. All 3 Classics share the 5,000 pound axle even though the 27fB has a 9,000 GVW while the 31'models have a 10,000 pound GVW.
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Old 10-20-2013, 07:29 AM   #72
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Swtiz,

I'm lucky,, I did my own PDI and had the AS CPC sheet, first thing on the list....two Henschen axles.

Funny, I never got paid for it and they didn't send my owners card.
They did however supply all the warranty items I needed.

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Old 10-24-2013, 11:55 PM   #73
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Ordered the 16" Sendel T02 and Michelin combo today to replace the near new 15's. Local Discount tire store matched the best online price, and they get to install instead of me.

Not sure if I should have just gone with the Michelin 15's and saved a bunch, but selling the current 15" rims and tires helped to cushion the cost. I plan on racking up miles and like the idea that I can exceed lower GYM speed ratings on long stretches if needed.

Dang, this forum is costing me. Ignorance may not be bliss but it is a whole lot cheaper.
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Old 10-25-2013, 10:59 AM   #74
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Good choice.You will see a big difference in tire quality.And piece of mind is a nice bonus
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Old 10-26-2013, 07:53 PM   #75
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Just found the tire inflation chart for the Michelin M/S 2 tire at 16". This is Michelin info:
(for dialing in inflation pressure need for load)
@PSI load supported (per tire)

35psi/1500lbs
40psi/1650lbs
45psi/1790lbs
50psi/1940lbs
55psi/2060lbs
60psi/2190lbs
65psi/2335lbs
70psi/2440lbs
75psi/2560lbs
80psi/2680lbs
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Old 10-26-2013, 08:27 PM   #76
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I keep hearing about people going from 15" rims to 16" rims. Why? Is it because of load ratings or speed ratings or both? Is there a problem with getting 15" tires of a high enough rating?
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Old 10-26-2013, 09:04 PM   #77
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Quote:
Originally Posted by msmcv51 View Post
I keep hearing about people going from 15" rims to 16" rims. Why? Is it because of load ratings or speed ratings or both? Is there a problem with getting 15" tires of a high enough rating?
My switch has nothing to do with ratings, but reliability and high failure rate of the original GYMs.
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Old 10-26-2013, 09:13 PM   #78
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Quote:
Originally Posted by rodsterinfl View Post
Just found the tire inflation chart for the Michelin M/S 2 tire at 16". This is Michelin info:
(for dialing in inflation pressure need for load)
@PSI load supported (per tire)

35psi/1500lbs
40psi/1650lbs
45psi/1790lbs
50psi/1940lbs
55psi/2060lbs
60psi/2190lbs
65psi/2335lbs
70psi/2440lbs
75psi/2560lbs
80psi/2680lbs
The Eddie Bauer model uses these tires and there is only one inflation pressure given for it on the info plate riveted to the shell, 80 lbs.

I was at Airstream last week and asked the service advisor what pressure they recommend when these tires are installed by them on any trailer, 80 lbs. They did a systems inspection on my trailer while there, and inflated my 16" Michelin M/S 2 tires to 80 lbs.

My sense is this chart applies to tires used on passenger/truck vehicles, not trailers.
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Old 10-26-2013, 09:50 PM   #79
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Perhaps, but I dug this up over another issue and thought it would be of value to the 16" tire conversion peeps too. There is only one pressure listed on my plate for the 15" and it is 65psi but I did not run them that high. I have the same tires on a Ford F-150 in a 245/17. One of the issues on the F-150 Forum is the tire pressure to run on E rated tires versus the D rated stock tires. I went through the discussions which led me to an article on trucks and tire pressure and load carrying. They gave a formula used by tire companies to determine their chart info. They recommended that people look for the manufacture's inflation chart info to optimize load to pressure as it effects wear and handling during use and in particular situations. It also allows for comparison between two tires with different load ratings using a PSI/LBS calculation. When I first got my new tow vehicle tires in June I filled them to 75 psi but quickly learned that it was too much. So I lowered it but was not sure where it needed to be specifically. I personally believe it would apply to the trailer as well since it is really about load and psi. The chart is the same data on the 16" Rib for RV and matches the light truck tires and does not matter if on drive wheels or not.
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Old 10-26-2013, 11:40 PM   #80
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Quote:
Originally Posted by dkottum View Post

The Eddie Bauer model uses these tires and there is only one inflation pressure given for it on the info plate riveted to the shell, 80 lbs.

I was at Airstream last week and asked the service advisor what pressure they recommend when these tires are installed by them on any trailer, 80 lbs. They did a systems inspection on my trailer while there, and inflated my 16" Michelin M/S 2 tires to 80 lbs.

My sense is this chart applies to tires used on passenger/truck vehicles, not trailers.
Doug, Rodsterinfl's chart is good to know and of use for the MS2, or a chart for any other tire for that matter, on a vehicle, trailer or whatever. It is the load capability of the tire at different PSI. With the MS2, for example, if your trailer's two axels are rated at 5000# each, you only need tires load rated at 2500# each. If say your trailer's max gross is 8000#, then you only need 4 tires that are rated at 2000# each. Knowing the weight a tire will carry at the different inflation pressures could be used to allow some lower pressure for a softer ride, tire wear considerations, or if you have tire pressure monitors installed, you have a pretty good idea whether you could proceed on a low tire pressure indication or need to stop and break out the spare. I questioned Chevy when I bought our TV 2500 chevy Duramax about chevy's door sticker of 60 psi front tires and 75 psi rear for the Goodyear original equipment. The E rated tires show 80 psi on sidewall. Chevy told me it was for tread wear and ride comfort. I put their 60 and 75 psi to Goodyears numbers such as these and found the reduced load each tire would carry added up to an exact match of the trucks front and rear axle rating. So, in fact, Chevy was de-rating the tires to match the axles. Liability concerns I suspect. All that said, might as well run at the 80 psi in your case since it is an overkill and that's a good thing. I run 80 in my 15 inch Maxxis on our 30 footer (2800+ lbs each at 80). 70 psi in those tires would still be more than needed, but why not go max.
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Old 10-27-2013, 07:55 AM   #81
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OK, here's the way this works:

The tire load tables indicate the MAXIMUM load a tire can carry at a given pressure.

The vehicle manufacturer (passenger car, truck, and trailer manufacturer) figures out what the MAXIMUM load per axle is going to be (GAWR), then adds some factoring to arrive at what inflation pressure is put on the vehicle tire placard. That applies to passenger cars, SUV, pickup trucks, vans, and trailers (and for motor vehicles, it applies to anything lower than 10K GVW.

If you look at motor vehicles you will find that the tire load carrying capacity (as calculated using the placard pressure and the load table) is some percentage LARGER than the minimum - I think you'll find that tires commonly are specified at 85% of the load table value.

Please note: This is EXACTLY what Firestone was pointing at when they accused Ford of using too little inflation pressure - and they had a point. It is NOT good engineering to operate ANYTHING (bolts, nuts, suspension members, etc) at its maximum. The part in question should ALWAYS be specified larger then the minimum - and that applies to tires as well.

And after that point in time, there was a move to fix this - and I think it was completed about 2008.

EXCEPT: Many trailer manufacturers didn't seem to pickup on this and still specify marginal tires - and because of that they'll also specify the maximum inflation pressure.

I think what ought to be gleaned from this is that you should NOT use the tire load tables AS IS. A factor should be applied just like the motor vehicle manufacturers do - and I recommend 85%.
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Old 10-27-2013, 08:12 AM   #82
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Hmmmm, who do I believe about tire pressure on my Michelin 16's?.

Airstream factory and Service Center recommends 80 psi. A tire engineer recommends less. I am suspect that 80 psi actually is maximum the tire can withstand, probably more, and Michelin has determined 80 psi is not actually at the upper edge but rather where they can be run without being at the upper edge. Maybe.

I've used 80 psi in these 16" Michelins about 10,000 miles without any apparent ill effects to the trailer or its contents. Airstream recommends it, it looks to me like I should stay the course.
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Old 10-27-2013, 10:22 AM   #83
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When I installed my 16" rims with Michelin M/S2, load range "E", Discount Tire said to run at 80lbs, which I have for the past four years. Seems to work great.
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Old 10-27-2013, 10:41 AM   #84
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Not sure I fully understand what CapriRacer means, but I think the gist is that the tires on our trailers should be capable of carrying a load of at least 15% greater than the gross weight we can load em up to. Can't remember the Flying Cloud 25's weight, but the 10 ply 16 inch MS 2s on Doug's trailer are capable of carrying much more weight than will ever be present. So at 80 psi or 70 psi, the tires are just coasting along and, if you will, doing very little work as compared to what they can do. Discount tire aired my Maxxis 8008s to 80 psi, COLD, the max pressure for E tires, giving me 2800+ pounds of weight carrying capacity each. Those tires will be at 90 psi on interstate 10 going 65 MPH in the middle of the Texas summer. Discount says, that is all accounted for, so just drive on. If that bothers me, I can drop the cold inflation to 75 or 70 psi, The weight the tire can carry there is still way in excess of the max gross for our 30 footer. The Marathons, original equipment, don't have that level of flexibility. My bet is that under inflation or a flaw in construction is the cause of 90% of tire failures, other than puncture wounds. We can only control the first, and that is where a pre travel pressure check and/or tire temp and pressure monitors come in.
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