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Old 09-01-2012, 09:21 PM   #29
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I seem to remember this statement at the beggining of his ST tire page.

First, this article is about travel trailers – RV’s – that have ST type tires. Other kinds of trailers or RV trailers with other types of tires are not addressed here.


If tire engineers are so godly why are so many ST tires failing? There are good and bad engineers and those bogged down in corporate BS and bureaucracy to do their jobs. So brand me a heretic. Following the status quo is not working and tires are failing. When ST tires are tested to the same standard of car tires I will start using them.

Perry
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Old 09-01-2012, 10:07 PM   #30
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Quote:
Originally Posted by perryg114
I seem to remember this statement at the beggining of his ST tire page.

First, this article is about travel trailers – RV’s – that have ST type tires. Other kinds of trailers or RV trailers with other types of tires are not addressed here.


If tire engineers are so godly why are so many ST tires failing? There are good and bad engineers and those bogged down in corporate BS and bureaucracy to do their jobs. So brand me a heretic. Following the status quo is not working and tires are failing. When ST tires are tested to the same standard of car tires I will start using them.

Perry
I'm with you.
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Old 09-05-2012, 07:26 PM   #31
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I will be talking about a single axle trailer only. The reason I stated that is that the need for ST tires is 0 (if you see a reason please respond).
We got so scared of blow-outs that we measure slightest differences in temperature, pressure, load and so on. That is the result of a badly designed tires from more than one manufacturer. If a tread separates at one set of conditions it will separate within all of conditions I read in this thread. If you choose a well designed tire rated for your use it will serve as well as if it would be installed at the rear of your TV, meaning 50kMI plus. What tire you choose is a subject of a different thread but for single axle LT tire 16", rated E is a good option.
With this in mind, I think 70 psig on the E rated tires (it drops the rating to D) is OK, I am watching mine for the last 4000 MI trip and I do not see any negative effect, they are colder compared to my TV tires (the same brand, type, size).
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Old 09-05-2012, 07:41 PM   #32
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I'm with you.
I sure you both misread the post. The thread is about max psi on tires, not ST tires. Try again.
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Old 09-05-2012, 09:13 PM   #33
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Originally Posted by REDNAX View Post
The pressure/load range tables are not for trailers.

There is a reason ST tires are marketed as having "stiffer sidewalls",

.
No Where on my ST tires does it say it has a stiffer sidewall.. how is it made stiffer? It sure doesn't have anymore belts in it. and plenty of people have busted ST tires parking their trailers. So if they do have stiffer sidewalls it isn't doing much..

Max PSI is just that. The MAX, it doesn't mean you have to run the MAX, I never have and never had a blow out. I sure don't run the Max on my TV.. And the Max weight of my ST tires was far above the weight of my trailer. So why would I run them at the Max if my Weight was nowhere near the Max. Just makes for a rough ride.

thats a lot of MAX
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Old 09-06-2012, 09:21 AM   #34
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If you take any tire at 80psi it will be a lot stiffer than at 50psi.

Perry
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Old 09-06-2012, 11:07 AM   #35
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OK, I don't think this will ever be settled. But I searched most of the tire company web sites and couldn't find to much info on putting your tires to max PSI.

What I did find was plenty of PEOPLE, NOT tire companies saying you should.

No it can't hurt a regular utility trailer or boat trailer to do this. But we are talking about AS and they want a smooth ride, not a bumpy one, and thats what MAX psi will do if the max weight rating of the tires is well over what the MAX weight of your trailer.

This is from the Goodyear website: (RV section on tires)

Proper Tire Inflation

Correct tire inflation is a key component in tire care. The recommended maximum inflation pressures for your tires are indicated on the certification label or in your owner's manual. Since RVs can be loaded with many different configurations, the load on each tire will vary. For this reason, actual air pressure required should be determined based on the load on each individual tire. Inflation pressure should be adjusted to handle the tire carrying the heaviest load, and all tires on the axle should be adjusted to this standard.
Each manufacturer provides load and inflation tables specific to their products to help you determine the correct tire inflation pressure for your vehicle's loading.
Underinflation brings a higher risk of susceptibility to damage due to road hazards, reduces casing durability, and causes a loss in fuel economy, plus uneven or irregular tire wear. Severe or prolonged underinflation brings about an increased risk of tread separation.


So, what ever you do don't under inflate your tires. But also don't over inflate them..

I don't think we will ever get a straight answer on this, even from the Tire industry..

My tires are rated to 9800 lbs, my trialer loaded is well under 2500 lbs of this. So I don't see the reason to run the max of 80 psi. It will give a harsher ride than is needed, and bounce the inside of my vintage AS. I'm I going to run 55 psi? NOPE. This is not an ST tire anymore either. I will run between 63-and 73 psi. I will have to play with it to see where the temps run the coolest, and the ride is the best.. IMO..
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Old 09-06-2012, 01:36 PM   #36
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Originally Posted by purman View Post

I don't think we will ever get a straight answer on this, even from the Tire industry..

.
You will not get an answer from them because they don't recommend truck tires on trailers. Until they do you will have to use whatever information you can find if you put LT tires on your trailer. You and only you have to live with what you choose. There are other who choose to do differently. They have to live with their decision also. You can't expect an company to spend money on research on how to use their product in a way they don't recommend.

Personally I am going to inflate mine to the max, because I'm pretty close to that anyway, and I believe that's the safest.

When my stiff suspension and fully inflated tires beat my airstream to death, I'll scrap it and buy one that will go to Mars. We'll probably be doing that by then . However, I'm not too worried about that.

Ken
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Old 09-06-2012, 01:57 PM   #37
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Jason is right that this will probably never be settled, but we keep trying.

As I understand it, ST tires were designed to have a stiffer sidewall than radials because of unique stresses on trailer tires, especially when backing and more especially while backing at severe angles. ST tires will skip sideways when backing at those angles, but LT's are less likely to. Their sidewalls flex and when they break free, they really jump. Put enough pressure on a sidewall and the tire will come off the wheel. This is very difficult to do, but whether the stress will damage the tire—invisible to you—is unknown to me. The flex in the sidewall means better traction at highway speeds unless you go much too fast—then they break free and you skid. Most people never experience that except maybe on snow and ice, or if they want to see how fast they can go.

Unfortunately, ST tires have many other problems, well documented on this Forum and on others. Radials have improved greatly over the years and some are built with steel cords in the sidewalls as well as in the tread. The Michelin Rib tire is one of those. Backing at extreme angles is to be avoided with any tire. As I have learned backing, I find I rarely ever have to back at extreme angles. That comes with experience.

One way to have a stiff sidewall is to inflate tires to the max allowed for a specific tire and wheel. I run Load Range E tires on the trailer at 72 lbs., not 80. Rednax recommends 80 lbs. He has more experience with trucks and trailers than most of us and he may be right.

Gene
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Old 09-06-2012, 02:22 PM   #38
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Quote:
Originally Posted by w7ts

You will not get an answer from them because they don't recommend truck tires on trailers. Until they do you will have to use whatever information you can find if you put LT tires on your trailer. You and only you have to live with what you choose. There are other who choose to do differently. They have to live with their decision also. You can't expect an company to spend money on research on how to use their product in a way they don't recommend.

Personally I am going to inflate mine to the max, because I'm pretty close to that anyway, and I believe that's the safest.

When my stiff suspension and fully inflated tires beat my airstream to death, I'll scrap it and buy one that will go to Mars. We'll probably be doing that by then . However, I'm not too worried about that.

Ken
If I ran closer to the weight max I would run them at the max. If you are running max you won't beat it to death. I think I would beat mine if I ran them at 80. Or at least give it a hard ride.

From what I have been able to read and not from tire companies The ST tires have thicker nylon side wall cords in them. The side walls on my D tires where 2 ply nylon cords. The same as my E rated LT tires. But I don't know if this is true as I can't find that info on any tire web site.
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Old 09-10-2012, 09:30 AM   #39
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What is to misunderstand? Trailer tires are a subset of RV tires, and as such are subject to forces not seen by all RV tires.

One can use the term interply shear as reference to this force in ones reading elsewhere. The type of tire used on a trailer does not change this, not does the need for greatest resistance to this force (which is maximum sidewall stated air pressure).

Read through Roger Marble's blog on RV tires (tireman9, on the forums to which he posts) for more info.

.
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