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Old 09-12-2015, 08:07 PM   #57
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Firestone TransForce HT LT225/75R16


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Old 09-12-2015, 08:12 PM   #58
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Each of 4 wheels actually carries + or - 2,200#, but the manufacturer says the wheels will support 3,850# each.
What has math got to do with that?
That just shows, according to the manufacturer, that the wheels can do it, not that I personally have that much weight on them.
I guess as you are traveling the load is constantly changing as you are driving around over bumps and rough surfaces.


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Old 09-12-2015, 08:16 PM   #59
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The choice of wheel really had nothing to do with weight carrying capacity, but it's good to know it's there.
It's better to have it and not need it than to need it and not have it.
The reason for getting new wheels was to be able to mount load rage E 10-ply truck tires because I have been burned by ST tires Twice. Why take a chance on a third time around and the possibility of damaging my wheel well or the side of my trailer.
All I was doing was stating the wheel manufacturer's specs.


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Old 09-13-2015, 09:18 AM   #60
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Like a chain that is only as strong as it's weakest link, the 31' Classic suspension's weak link, so to speak, are the tires, especially the original GYM ST225/75R15D tires rated 2,540 pounds @ 65 psi that came on 2014 and earlier models with the GVW of 10,000 pounds.

On average, my Michelin LT225/75R16/E LTX M/S2 trailer tires are carrying 2,050 pounds. But one is carrying 2,150 pounds and one is loaded to 1,950 pounds. Those load numbers might imply that there is adequate "spare" load capacity on the stock GYM tires.

The issue I started reading about here in Airforms in October of 2012 before I even acquired my first Airstream, the 2013 25FB with a GVW of 7,300 pounds, was the absurd number of tires issues that often caused expensive and extensive damage to the Airstream. The culprit tire and model mentioned most of the time was the GYM ST225/75R15D tire.

I had used only Michelin tires on all of my vehicles for over 40 years, so when there were virtually no issues reported during my research with the Michelin LTX (P) 235/75R15 XL tire with a derated capacity of 1,983 pounds for trailer use, I switched to that tire using the stock rims as soon as the trailer was brought home. I had a screw enter the edge of one of the new tires and it had to be replaced under the road hazard warranty. This same model tires mounted on SenDel T03-56545T wheels rated 2,150 pounds at 60psi were also installed at the selling dealership before I took delivery of a 2015 23D International which has a GVW of 6,000 pounds.

The Classic had the Michelin LT225/75R16/E LTX M/S2 tires with the SenDel T03-66655T wheels installed as soon as I got it home and in the storage unit.

For me, the safety priority is safe and reliable tires followed by great brakes. I want to be sure I can safely stop the train whenever necessary.
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Old 09-14-2015, 05:37 PM   #61
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Be careful about assuming "Correlation equates to Causation" Simply becasue most of the tire complaints were on GY marathon when you were reading AS forums can be misleading in that since the majority of As come with GY Marathon they one would expect most of the tire failures to be with GY Marathons.

This would be like claiming that Ohio RV builders are poor workers and don't do a good job, as the majority of problems reported came from AS units built by Ohio workers.

It's good that you have educated yourself about tires and the importance of proper loading and inflation. With a majority of RV's on the road haveing one or more tire or axle in overload condition when weighed and a goodly portion of TT being towed at speeds that exceed the max speed rating of many of the tires it's no wonder that there aren't more reported tire problems.
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Old 09-14-2015, 07:56 PM   #62
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Tireman-- if running load range E tires on an Airstream that only needs load range D, do you still recommend running them at the max of 80psi?
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Old 09-14-2015, 08:27 PM   #63
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was just watching a video on a 2015 airstream from Colonial in NJ and they were showing the tires being michelin LT 16s on alum rims, so I guess the ST tire issue on travel trailers is not all that big a deal..

all the guys that have switched will tell you to switch and be happy, as in no blow out. but it's a free world.

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Here's another 2 cents. Not being familiar with your brand of tire I can't comment on it but a failure for no obvious reason is very odd. You didn't say what type of tire it is. I have been towing a 26' A/S for 27 years and I don't recommend anything less than an ST type tire, whoever the manufacturer is. I personally have run Goodyear Marathon ST's for 14 years now with no problems whatsoever. My fellow club members who run Maxxis have had similar experience. Both are available in load range D. The reason you want to run ST's is that when turning a tandem axle sharply, esp. when backing, large side wall stress occurs. ST's are designed to resist damage from those normal stresses. Last I heard, Michelin does not make an ST.
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Old 09-14-2015, 08:37 PM   #64
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I am not sure there is a tire that is "less than a ST type tire".
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Old 09-14-2015, 11:13 PM   #65
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Federal standards for tires

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Originally Posted by Tireman9 View Post
SWITZ
Be careful about assuming "Correlation equates to Causation" Simply becasue most of the tire complaints were on GY marathon when you were reading AS forums can be misleading in that since the majority of As come with GY Marathon they one would expect most of the tire failures to be with GY Marathons.

This would be like claiming that Ohio RV builders are poor workers and don't do a good job, as the majority of problems reported came from AS units built by Ohio workers.

It's good that you have educated yourself about tires and the importance of proper loading and inflation. With a majority of RV's on the road haveing one or more tire or axle in overload condition when weighed and a goodly portion of TT being towed at speeds that exceed the max speed rating of many of the tires it's no wonder that there aren't more reported tire problems.
Tireman, regarding ST vs. P and LT tires:

I just read FMVSS 139. It requires tires to pass certain tests. It applies to P and LT tires in load ranges C, D, and E. It does not apply to ST tires, but refers to FMVSS 109 for ST tires. 109 defines similar tests, but uses lowers speeds for the tests.

I'm not sure I understand the documents I found. Is 109 valid for today's ST tires? Do these standards together say that P and LT tires are required to pass more stringent tests that ST tires are?
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Old 09-15-2015, 08:13 AM   #66
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Originally Posted by Tireman9 View Post
It's good that you have educated yourself about tires and the importance of proper loading and inflation. With a majority of RV's on the road having one or more tire or axle in overload condition when weighed and a goodly portion of TT being towed at speeds that exceed the max speed rating of many of the tires it's no wonder that there aren't more reported tire problems.
Very good statement. While driving across the country this summer we were amazed at all the trailers which passed us that we later discovered on the side of the road with blowouts. It was simply remarkable.
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Old 09-15-2015, 12:47 PM   #67
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I changed to the Michelin tires aa couple of years ago. I have an 800 watt inverter and Wal Mart air compressor that I use for TV and TT tires.
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Old 09-15-2015, 02:12 PM   #68
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Tireman-- if running load range E tires on an Airstream that only needs load range D, do you still recommend running them at the max of 80psi?

IMO I would run the pressure on the tire sidewall. This will do two things.
- Increase your margin of load capacity to about 15 - 20%
- Lower the Interply Shear which can contribute to early removal due to belt separations
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Old 09-15-2015, 04:00 PM   #69
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On my big trucks we use steer axle tires on the trailers , my marathons have 18,000 miles on our 13 31' classic they are doing fine,with 7720 lbs on the two axles, : I don't like any Chinese tires, I wouldn't put them on my pickup nor on my Kenworth, when the time comes i will probably go with 16 " michelins....
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Old 09-15-2015, 04:39 PM   #70
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My Goodyear Marathons all 4 failed on my '13 Classic 30.
Granted, I might have towed my trailer 30,000 miles, but it wasn't the tread life. The bad, separated tires still have a lot of tread left. I just don't think any ST tire will last over 3 years.
I switched to 16" wheels and Firestone TransForce HT LT225/75R16 tires because I could not justify the price of Michelins.
My tires typically dry rot with 7/32 tread depth left.


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