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Old 10-24-2015, 05:47 PM   #99
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The Marathons that came on my new '10 FC were, unknown to me till I recently checked, actually a year older than the trailer which was built in June '09. Never had a problem with them in 7 years but I did just replace them with Michelins.
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Old 10-24-2015, 07:51 PM   #100
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Is there much of a difference in the "ride" or "stiffness" between 15" ST and 16" LT at higher pressure?
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Old 10-25-2015, 09:26 AM   #101
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Quote:
Originally Posted by Tireman9 View Post
Ur right Jack. Switching to a larger, speed rated tire is a good way to get increased tire life. Do you by any chance have the comparison of safety margin of load capacity from when you were doing the calculations do learn what size & LR of LT type tire you needed?
I have seen a number of TT with OE ST type tires with margin of about 1% which is a long way from the suggested 15% minimum margin.

Well my current 225 X 75R 16" Michelin's have a 2680 lb load capacity at 80 psi. At max load that gives me 15%. I only do one 200 mile trip a year where the trailer is carrying that load. Typically I'm towing about 480 lbs lighter, which is due to my 60 gallon fresh water tank being empty.

Consider the 225 X 75 R 15" Maxxis E rated tires that these replaced had a 2830 lb. load capacity. At the time when I put on the Maxxis tires, I thought that the additional load capacity would address the issue of the stresses that my heavy Classic presented. The D rated Marathons that came with the trailer had a 2540 load limit at 65 PSI on 225 X 75R 15" D rating.

Nothing surprised me more was to return from a trip and discover that along that ride home (water tank empty) to find both Maxxis front axle tires had experienced belt slippage resulting in the tires ballooning. Click image for larger version

Name:	ImageUploadedByTapatalk1445781750.150912.jpg
Views:	78
Size:	414.8 KB
ID:	250988. Here's a picture of one tire shown next to a tire that hadn't failed.

What convinced me that ST tires were not in my best interest was this info from discounttiredirect. http://www.discounttire.com/dtcs/inf...erTireFacts.do. It pretty much lays out the case that ST tires lose 1/3 of their load capacity after 3 years. My belt failures occurring at the end of year 3 and the beginning of year 4 of use.

All of this really makes me believe that over time, ST tires aren't really up to the task of a trailer in my weight class. That's why I made the jump to LT's.

Jack
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Old 10-25-2015, 10:11 AM   #102
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Aren't all of the tires on the trailer supposed to be the same? Same make, same size? ESPECIALLY for multiple axles?
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Old 10-25-2015, 11:10 AM   #103
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Quote:
Originally Posted by jcanavera View Post
Not quite sure if you want to do that. If you find that in your usage that the LT's give you good service, going back to ST tires might yield you a serous case of regret. I think many of us who made the jump to LT's haven't second guessed making the change. In the years I've been monitoring this topic, I've not seen anyone who made the 16" wheel, LT tire jump, come back here with regrets for doing so. As I noted earlier we are now approaching 4-5 years with member experience using LT's and we haven't seen them coming back with the issues we have seen with ST users.

Jack
Yep, I'm going to stay with the LT tires as I'm comfortable with them and have no reason to switch back to the ST tires. In my experience, the LT tire has outperformed the ST tire. (My trouble with the ST tire is described earlier in the forum string, if anyone cares to read it.) Again, thanks Jack for your input!
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Old 10-25-2015, 12:45 PM   #104
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Originally Posted by nrgtrakr View Post
Aren't all of the tires on the trailer supposed to be the same? Same make, same size? ESPECIALLY for multiple axles?
Same size and type, yes. Same make? I guess it depends upon how that set of tires holds up over the years. I've always used 4 of the same make, size, and age.

When my Marathon tire lost a section of tread, I replaced them all. When two of my Maxxis tires experience belt slippage at the same time, I replaced them all.

Failures like I experienced made me lose confidence that the others wouldn't experience the same problem shortly, so I replaced the entire set. If the tire was relatively new, I'd consider replacement of the single tire with a like kind. Once you get into later stages of tire life, 3+ years, you start having your doubts about the others if the failure is not caused by a road hazard.

Jack
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Old 10-25-2015, 01:47 PM   #105
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Originally Posted by martian View Post
I surrender Tireman9, this discussion has become too technical for my weak brain to comprehend. I would like your recommendation. When the time comes to replace my LT tires on the trailer, should I go to ST tires? What would be the best configuration (load rating & other specs) for a 27 to 31 ft Classic? Please don't respond with "It depends." I'd blow a fuse.
If you are running LT type tires and know that the rated load capacity of the current size LT tires equals or exceeds the load capacity of the original ST type tires then you should be good to go.
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Old 10-25-2015, 01:57 PM   #106
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A question for all who have had failures on any type tire. Did you make the effort to file a complaint with NHTSA?
Not filing complaint does not give the regulators the data and numbers they need to justify considering initiating an investigation.

Recalls are the only way tire quality will really improve IMO.

You only need provide the TT or TV VIN and tire complete DOT serial (including date code). They don't need to know about your travel route or plans. Capturing a couple pictures if possible and let them know you have pictures available if they need. If there was damage include the total dollar amount.
Most of the time they will not contact you back but if enough people make the effort to file a complaint there migh actually be an investigation.

Remember you are working against the lobby efforts $$$$ of some in the industry who do not want tires or their application investigated or improved so numbers are needed.
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Old 10-25-2015, 02:00 PM   #107
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Originally Posted by jcanavera View Post
Well my current 225 X 75R 16" Michelin's have a 2680 lb load capacity at 80 psi. At max load that gives me 15%. I only do one 200 mile trip a year where the trailer is carrying that load. Typically I'm towing about 480 lbs lighter, which is due to my 60 gallon fresh water tank being empty.

Consider the 225 X 75 R 15" Maxxis E rated tires that these replaced had a 2830 lb. load capacity. At the time when I put on the Maxxis tires, I thought that the additional load capacity would address the issue of the stresses that my heavy Classic presented. The D rated Marathons that came with the trailer had a 2540 load limit at 65 PSI on 225 X 75R 15" D rating.

Nothing surprised me more was to return from a trip and discover that along that ride home (water tank empty) to find both Maxxis front axle tires had experienced belt slippage resulting in the tires ballooning. Attachment 250988. Here's a picture of one tire shown next to a tire that hadn't failed.

What convinced me that ST tires were not in my best interest was this info from discounttiredirect. http://www.discounttire.com/dtcs/inf...erTireFacts.do. It pretty much lays out the case that ST tires lose 1/3 of their load capacity after 3 years. My belt failures occurring at the end of year 3 and the beginning of year 4 of use.

All of this really makes me believe that over time, ST tires aren't really up to the task of a trailer in my weight class. That's why I made the jump to LT's.

Jack
Your situation should have resulted in an adjustment from tire dealer IMO.
Also classic good example of tires that justify a NHTSA complaint being filed.
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Old 10-25-2015, 02:07 PM   #108
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Did a two post series on my blog. June 23, 2014 and July 15, 2014 on topic of ST to LT switch. Was aimed at 5th wheel TT but all the info applies to anyone considering making the change.
You have to check my profile for info on my blog.
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Old 10-25-2015, 02:13 PM   #109
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Originally Posted by SSquared View Post
This seems like a major point: I think you are saying, an ST tire rated for a load capacity of X has less real-world load capacity than an LT tire rated for X.

Tireman, is there any rule of thumb or SWAG that would say what percentage difference it would be? Or is it two much apples and oranges? And would the same be true for comparing an ST tire rating to a P tire rating?
Did a blog post with numbers back in September 14, 2011 that shows the spec load capacity difference between different "type" tires that many might consider to be the same "size".

in the example the load capacity ranged from 1,377# to 2,340# depending just on application. All had essentially same OD and width and were on 15" rim.
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Old 10-25-2015, 02:20 PM   #110
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Aren't all of the tires on the trailer supposed to be the same? Same make, same size? ESPECIALLY for multiple axles?

Never seen anything indicating that trailer tires must be "same make, brand and size)

But I would suggest that for consistent response, especially in an emergency situation all tires on a TT should have be same size and inflation.

TT are probably a bit less critical than TV.

Fronts of TV should be same make, model, size and same inflation.

Rears in dual application should definitely be matched in pairs to be same brand, design, inflation and even measure similar OC within +/- 3/4"

I have covered matching duals in my blog.
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Old 10-25-2015, 10:18 PM   #111
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Quote:
Originally Posted by Tireman9 View Post
Your situation should have resulted in an adjustment from tire dealer IMO.
Also classic good example of tires that justify a NHTSA complaint being filed.

Problem for me is that there is no local outlet for Maxxis tires in the metro St. Louis area. I got these from a dealer about 140 miles southwest of us. My neighbor was working at the time in that area so it was easy for him to pick them up for me. I wasn't up for a 280 mile trip and then that lingering concern that the other two tires on the rear axle may be on their way to a similar fate. Once you lose confidence in a product, using it again is difficult. Especially with the fact that I was extremely lucky in catching these prior to a failure on the road.

Jack
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Old 10-25-2015, 11:57 PM   #112
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Tireman9, you keep repeating that "interply shear" is the primary cause of ST tire failures. Before switching to 16" wheels and LT tires, I had 3 of 5 ST tires fail with tread separation (two GYMs and one Maxxis).

Our 19' Bambi has a single axle, so interply shear is not a significant factor when towing, backing, etc.

We now have about 40,000 miles on our 275/75x16 Michelin XPS Ribs (LT, load range E, inflated to 80 psi), and have had absolutely no tire problems in 4 years.

How do you explain the difference between ST and LT tire reliability on our Airstream?
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