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Old 12-16-2012, 09:05 PM   #1
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Another Airstream Tire / Wheel Surprise

Today was the day to switch all five Good Year Marathon ST 225/75R15D tires (with about 450 miles on them) for the previously purchased Michelin LTX (P) 235/75R15 XL tires. I have a combination jack-stand/bottle jack that I used to raise one side of the trailer after dropping the spare tire. I took off the front tandem and installed the spare just snugging the wheel nuts. Then I removed the rear tandem tire and loaded the two tires into my TV. I noticed undulations in the sidewalls of all five GYM tires.

After switching the tires at the tire store, I returned to the trailer. I had noticed that there was paint on the inside of the Airstream 15" wheel on the bolt circle that had come from the Centramatic wheel balancers. While using a manual wire brush to remove the paint, I noticed there was information cast on the inside of the wheel in each of the several reinforcing rib sections.

The contents of the circle are listed below with a dash between each group to represent the raised web in the casting:

Made In China - HT - DOT/T - 104 - SenDel and a logo - Max Load - 5/2150 & 6/2540 pounds - 15XJJ ET + 0 - XR

I read this as a wheel with a 2,150 pound rating in tandem applications (5 or less wheels) and 2,540 pound rating with three axles or six wheels. I also see a 104 load rating. My Michelin tires have a 108 load rating and carry more load per the sidewall (2,183 pounds) than the wheel at it's lower rating.

It appears that these same 15" wheels are used by Airstream for all trailers except the Eddie Bauer units with 16" wheels.

Tomorrow will be Cat scales day with several 40 mile each way trips.

The first will be basically an empty trailer (virtually no water in the fresh water tank and neither the gray or black have been used) and none of my stuff aboard except for the wrenches needed for the trip (Torque wrench to check every 10 miles a couple of times then every 50 a couple of times) and the Wrench to adjust the Hensley. The TV tank will be filled at the scales.

The second trip will have a full fresh water tank and all of my tools and stuff stowed where I think it should be. The TV tank will be filled again at the scales. I may find that I need to move stuff around for another pass to get the proper weight distribution.

One may wish to inspect their wheels to ensure the wheel is also rated for the load. A great tire on a not so great wheel still ends up as a not so great assembly.
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Old 12-16-2012, 09:32 PM   #2
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Quote:
Max Load - 5/2150 & 6/2540 pounds
Not 100% sure, but I think it means 5 lug/2150 lbs, 6 lug/2540 lbs rating.
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Old 12-16-2012, 09:34 PM   #3
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A Potential NHTSA Safety Recall Issue?

Quote:
Originally Posted by switz View Post
...I noticed there was information cast on the inside of the wheel in each of the several reinforcing rib sections.

The contents of the circle are listed below with a dash between each group to represent the raised web in the casting:

Made In China - HT - DOT/T - 104 - SenDel and a logo - Max Load - 5/2150 & 6/2540 pounds - 15XJJ ET + 0 - XR

I read this as a wheel with a 2,150 pound rating in tandem applications (5 or less wheels) and 2,540 pound rating with three axles or six wheels. I also see a 104 load rating. My Michelin tires have a 108 load rating and carry more load per the sidewall (2,183 pounds) than the wheel at it's lower rating.

It appears that these same 15" wheels are used by Airstream for all trailers except the Eddie Bauer units with 16" wheels....
If your interpretation of the information on the castings is correct, and these wheels are used on 30` and above AS TT, then the wheel rating seems to be exceeded.

Was there any information on the wheels concernibg maximum inflation pressure?

Why would the wheel rateing per wheel for six tires on the ground be higher than the wheel rateing per wheel for four tires on the ground for the exact same wheel?

How many lug bolt holes does the wheel have?
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Old 12-16-2012, 09:52 PM   #4
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I had posted this in another tread, the Alcoa 15" aluminum wheels that came stock on the trailer have stamped max load 2200lbs.
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Old 12-17-2012, 07:35 AM   #5
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These are the Airstream factory six lug wheels that came on my 2013 25FB International with a late June 2013 build date. In looking at the 2013 sales literature, these wheels may be specific to the International trim level which can reach 30' 11" and 8,800 pounds GVW.

The information I posted is not stamped, but cast into the wheel from the mold so one sees raised letters. No inflation information is provided, but Airstream's use of GYM ST tires would require 65 psi.

BTW, the spare has a steel wheel. Thus one has supper deep lug nuts to accommodate both thick aluminum wheels and thin steel wheels.
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Old 12-17-2012, 08:47 AM   #6
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Quote:
Originally Posted by switz View Post
These are the Airstream factory six lug wheels that came on my 2013 25FB International with a late June 2013 build date. In looking at the 2013 sales literature, these wheels may be specific to the International trim level which can reach 30' 11" and 8,800 pounds GVW.

The information I posted is not stamped, but cast into the wheel from the mold so one sees raised letters. No inflation information is provided, but Airstream's use of GYM ST tires would require 65 psi.

BTW, the spare has a steel wheel. Thus one has supper deep lug nuts to accommodate both thick aluminum wheels and thin steel wheels.
If you look on the sendel site they spec the load rating and pressure, Here is an example:

Sendel
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Old 12-17-2012, 11:00 AM   #7
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So with 6 lug wheels rated at 2500 lbs you should be good to go, right? Load range C XL tires at 50 psi. Ought to work fine.
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Old 12-17-2012, 12:05 PM   #8
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A couple of thoughts:

First, you have to reduce the load carrying capacity of P type tires by a factor of 1.1 when using them on pickup tracks, vans, and trailers - making a 235/75R15 XL have a load carrying capacity of 1984# at 41 psi.

Note: You do NOT have to reduce the load carrying capacity of LT type tires for trailer application.

Another note: LT and ST type tires come in Load Ranges (A, B, C, etc) and P type tires come in Standard Load (SL) and Extra Load (XL), so an XL is NOT the same as a Load Range C!!

2nd thought: An ST225/75R15 Load Range D has a load carrying capacity of 2540# at 65 psi.

So if I am reading this right, the tires that just went on Switz's trailer are overloaded.
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Old 12-17-2012, 12:07 PM   #9
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2500 lbs/wheel will carry the heaviest Airstream built today, 30/31' Classic with a GVWR of 10,000 lbs.
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Old 12-17-2012, 12:40 PM   #10
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Quote:
Originally Posted by CapriRacer View Post
A couple of thoughts:

First, you have to reduce the load carrying capacity of P type tires by a factor of 1.1 when using them on pickup tracks, vans, and trailers - making a 235/75R15 XL have a load carrying capacity of 1984# at 41 psi.

Note: You do NOT have to reduce the load carrying capacity of LT type tires for trailer application.

Another note: LT and ST type tires come in Load Ranges (A, B, C, etc) and P type tires come in Standard Load (SL) and Extra Load (XL), so an XL is NOT the same as a Load Range C!!

2nd thought: An ST225/75R15 Load Range D has a load carrying capacity of 2540# at 65 psi.

So if I am reading this right, the tires that just went on Switz's trailer are overloaded.
Switz' signature lists a 2013 25' International. Airstream lists a max gross weight of 7300 lb for that trailer. So no, the tires that just went on Switz' trailer are not overloaded, even if he runs them underinflated at the 41 PSI you specified.
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Old 12-18-2012, 12:28 AM   #11
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Just returned from the scales.

With basically no fluids and no personal stuff aboard, the rear axles are supporting 5,300 pounds. The next trip included all my tools at the rear of the trailer, lots of kitchen stuff, a full tank of diesel fuel in the TV, the wife in the front seat of the TV, full 39 gallons of fresh water in the tank, and a 40 pound air compressor and 20 pound jack in the back of the TV and the rig total weight went up 820 pounds but the load on the trailer axles increased only 560 pounds to 5,860 pounds. That works out to about 1,465 pounds per tire with a sidewall rating of 2,183 and a derated load capacity 1,985 pounds or a 27% safety margin on the derated capacity or a 33% safety factory based upon the sidewall number.

Tomorrow will weigh the tongue weight again to see where I am.
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Old 12-18-2012, 04:39 AM   #12
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Originally Posted by DKB_SATX View Post
Switz' signature lists a 2013 25' International. Airstream lists a max gross weight of 7300 lb for that trailer. So no, the tires that just went on Switz' trailer are not overloaded, even if he runs them underinflated at the 41 PSI you specified.
Just one little quibble. P metric XL tires aren't under unflated at 41 psi. That's where the max load carrying capacity occurs. This is different than ST and LT tires where Load Range C tires have the load carrying capacity occurs at 50 psi.
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Old 12-18-2012, 06:21 AM   #13
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Quote:
Originally Posted by CapriRacer View Post
Just one little quibble. P metric XL tires aren't under unflated at 41 psi. That's where the max load carrying capacity occurs. This is different than ST and LT tires where Load Range C tires have the load carrying capacity occurs at 50 psi.
The max pressure listed on the sidewall of the Michelin LTX M/S2 P 235/75/15 XL 108T is 50 PSI.
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Old 12-18-2012, 06:56 AM   #14
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.......hey I'll take those 450mi GYM's.

too bad JC is now using china wheels.


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