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Old 07-20-2013, 07:59 PM   #43
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This image shows one of the original GYM ST225/75R15D tires with about 500 miles on the left beside the Michelin LTX (P) 235/75R15 XL tire I replaced it with on the right. I did replace all 5 GYM tires with the Michelins. The GYM diameter is 28.3" versus the Michelin diameter of 28.9". Note that the tread with and thus the contact patch on the road are wider and larger on the Michelin tire.
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Old 07-20-2013, 09:01 PM   #44
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Switz, what did you do to modify the spare tire carrier to fit the Michelin 15 as a spare? Putting 4 new Michelins onto my Airstream was one of the first things I did - within 500 miles - after seeing that the GYM were made in China. I then tried to change the spare to a Michelin and then found out (in my own driveway) that 10 mm width difference would not allow the spare tire carrier to close. Thanks
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Old 07-20-2013, 09:10 PM   #45
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I used a 21" crescent wrench as a lever and put each "up" arm of the tire bracket into the handle eye and bent the arm outwards. I was too enthusiastic on the first try and had to bend them back in a little. It is a challenge to get the latch to operate, but I was able to do it. That exercise provided the opportunity to remember some old Navy phraseology.
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2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels
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Old 07-21-2013, 06:14 AM   #46
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I did nothing to modify my spare tire carrier on my 05 Safari. The same Michelin 15" tire fit fine.
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Old 07-21-2013, 07:17 AM   #47
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Question, one of my 3 year old GYM's may have something going on. The inner tread is at one level but the outer tread on both sides stands slightly higher, maybe as much as 1/8". Is this a sign of an internal problem?

Probably, but it is also possible from your description to conclude you have a wear issue. It's not clear. A picture would help here.
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Old 07-21-2013, 07:41 AM   #48
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Naturally, me AS is in storage so no pics available right now. I will get it done though. I appreciate everyone offering comments.
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Old 07-22-2013, 09:26 AM   #49
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Tires - Carlisle

I wish I had read Andy's response prior to my purchase of 2 Carlisle Radial Trail, ST225/75R D/8 2-ply for our Bambi 19 foot'er. I have dealt with the owner of the tire shop for several years, and he handles severl brands. He said the Carlisle, he felt, was the best for our trailor. I would like to see if anyone else likes/dislikes Carlisle in this conversation.
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Old 07-22-2013, 11:05 AM   #50
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I don't mean to necessarily disparage tire dealers, but my experience over the years is that most of they guys selling tires are more interested in selling what they have in stock, and that is often what they make the most markup on.
Honestly, I think a consumer of average intelligence could spend one hour on the internet reading about tires from the various manufacturers websites, and know more about the subject than most tire salesmen/service writers.

A dealer also has at least tiny bit of vested interest in selling you something that might have you back in the shop sooner to replace it. And dealers of all sorts of products apparently "go to class" on how to blame the customer for any failure that comes into the shop. Certainly they are often right....tires run underinflated, overloaded, etc, but often I suspect that it's just an outright failure of the product, yet the dealer has a ready response to try to shift the blame to the consumer. Call me sceptical.

It certainly doesn't help matters much when the RV industry has a bad habit of fitting components ( including tires ) that are close to design limits. My experience in general in life has been that the closer I run something to it's stated design limit, the more likely a failure is going to occur. A tire rated for just 65mph is an example of that idea.
"Just say NO" to ST tires.............LT tires have solved my issues ( so far ) on the four trailers I use on a regular basis.
That's just my opinion based on my personal experience and my observation over the last 40 years of towing various things. I have enough other issues to think about without having to concentrate on whether a tire is gonna go pop for no good reason.
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Old 07-22-2013, 01:21 PM   #51
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Having posted photo of failed Carlisle I should probably be more critical, but they are probably as good as the Goodyear's.. With wisdom of hindsight, tire that failed last month was 7 years old and that really seems to be outer edge of useful life of tire structure for ST Tires.. In addition, tire that failed was in same location as prior failure (GYM in 2006 - curb side front wheel) and I am now wondering (as I prepare to replace axles..) if that particular wheel/axle combo was out of alignment leading to more wear/side scrubbing of that tire...

Seeing the small finished size differences with Michelin LTX tires, those with higher speed rating and better structural strength look like good option if there is clearance in fender wells...
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Old 07-23-2013, 07:02 AM   #52
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I had no wheel well clearance issues installing four fully inflated Michelin LTX (P) 235/75R15 XL tires on our 2013 25FB International. I did have to bend the spare wheel carrier upright arms outwards a little to get the tire to seat fully in the pocket. To be perfectly clear, I used the original Airstream factory wheels with the new tires, so there was the proper zero offset. I also have the Centramatic wheel balancers installed which does move the wheel about 1/16" or less away from the brake drum.

Lacking the strength of my 20s, getting the blasted flipping metal strap and pin in place to lock the tire carrier in the storage position was a challenge that generated a few forgotten naval phrases. I could have probably used my hydraulic jack with stand capability and saved the lingo for a more serious issue.
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Old 07-23-2013, 11:06 AM   #53
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Carlisle

I got a note with a great amount of information that I am delving into about tires. However, I replaced my origional 2006 GYM with approx 4000 miles a couple months ago because of age and cracking on the sidewalls--tread still had the rubber nubs--no other issue). Trailer purchased a little over a year ago and had been used once, and garaged all that time. I talked to my tire dealer this morning re the Carlisle, marked 2-ply and he assured me it was equivalent to an 8-ply on other tires because of the make-up of the Carlisles. This dealer is as honest as the day is long and he does not Recommend change? Input?
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Old 07-23-2013, 11:08 AM   #54
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Tire Upgrade

So, after reviewing almost all of the threads. Once question:

2001 Safari 25FB- Funds not being an option. Extensive travel in South and Southwest.

What is the "ultimate" wheel/tire solution?
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Old 07-24-2013, 05:33 AM   #55
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I got a note with a great amount of information that I am delving into about tires. However, I replaced my origional 2006 GYM with approx 4000 miles a couple months ago because of age and cracking on the sidewalls--tread still had the rubber nubs--no other issue). Trailer purchased a little over a year ago and had been used once, and garaged all that time. I talked to my tire dealer this morning re the Carlisle, marked 2-ply and he assured me it was equivalent to an 8-ply on other tires because of the make-up of the Carlisles. This dealer is as honest as the day is long and he does not Recommend change? Input?

Yes, there is an obsolete terminology "ply" and not only doesn't it mean want it sounds like it means, it's also obsolete for that very reason.

Tires now come in "Load Ranges" designated by letters. In the old days they used to use the term "Ply Rating" - meaning "Equivalent to X number of plies" - short to plies. Nowadays is also has no meaning because the strength of modern materials to so much strong than the old days.

For example, over the road trucks use a single steel ply for Load Range H (16 ply rating).

So look at your old tires and find the "Load Range". I recommend you move up a load range - eg: C to D or D to E - and use the higher pressure. This is to add unused load carrying capacity, which is safer.
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Old 07-24-2013, 05:42 AM   #56
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So, after reviewing almost all of the threads. Once question:

2001 Safari 25FB- Funds not being an option. Extensive travel in South and Southwest.

What is the "ultimate" wheel/tire solution?
I was sure some others would chime in here. If you mean money is no object, switch to 16" rims and go for the Michelins load range E. There is an entire thread dedicated to it you can read. If there is an "ultimate solution" tire, that would be it.
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