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Old 05-31-2013, 06:13 AM   #15
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Originally Posted by interstateflyer View Post
So am I correct in assuming that the 10% load capacity derating only applies to (P) passenger not (LT) light truck Michelin LTX M/S2 tires?
Yes, you are correct. P types tire need to be derated. LT type tires are already derated.
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Old 05-31-2013, 07:13 AM   #16
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Originally Posted by CapriRacer View Post

Yes, you are correct. P types tire need to be derated. LT type tires are already derated.


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About to head out with the new michelins, I have them at 50psi and will be curious what the hot psi is
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Old 05-31-2013, 08:31 AM   #17
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Originally Posted by outofcontrol View Post
Just curious, where do you find this information? I'd like to check other tires' ratings. I didn't even know they rate LT tires for trailers.

I like the idea of 70,000 miles.

-Kevin
The OP correctly described the Michelin P235/75R15XL tire.

When P designed tires are used on trailer axles they MUST be de rated. The tires maximum load capacity - in this case - is 2183#. By DOT regulation that figure is then divided by 1.1 to determine its maximum load capacity (1984#) for trailer axle service.
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Old 06-01-2013, 08:56 AM   #18
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Tire pressures have me confused . As an example my 09 2500 hd has a gvw of 9200lbs , The tire inflation label on the door calls for 60psi front and 72psi rear, gvw for front is 4800and 6084 rear the tires call for max of 80 psi . So if I was loaded to 9200 gvw my front tires would be carrying 2400lbs ea. and the rear 3042lbs ea.So why do the tires on a tandem axle Airstream need 80psi on a E rated tire ? Wbcci #14183 Les from Ohio
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Old 06-01-2013, 10:53 AM   #19
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In case everybody does not know by now: The old Michelin LTX tires were a LT tire. I bought a set in 2008 and ran them until last month. The worked great. They did have surface cracking this year. The new Michelin LTX are a P rated tire but they are rated at 50 psi.(XL) And Michelin does not now make a LT tire in 15". I also jut put on a set of the Michelin LTX. P-235/75/R15XL.
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Old 06-02-2013, 05:57 AM   #20
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Originally Posted by Bill M. View Post
In case everybody does not know by now: The old Michelin LTX tires were a LT tire. I bought a set in 2008 and ran them until last month. The worked great. They did have surface cracking this year. The new Michelin LTX are a P rated tire but they are rated at 50 psi.(XL) And Michelin does not now make a LT tire in 15". I also jut put on a set of the Michelin LTX. P-235/75/R15XL.
You have to be very careful here.

If a tire size starts with the letter "P", it is a P metric tire. That means the tire has been designed to The Tire and Rim Association's standard for P metric tires - and there is a load vs pressure table that applies. These tires come in "Standard Load" (SL) and "Extra Load" (XL).

If the tire has the letters "LT" in front of the tire size, it is an LT metric tire and it has been designed to The Tire and Rim Association's standard for LT metric tires - and a different load vs inflation pressure table applies. These tires come in "Load Ranges" - C, D, E, etc.

So a P235/75R15 XL is a P metric tire.
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Old 06-02-2013, 06:06 AM   #21
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Originally Posted by woodfox45 View Post
Tire pressures have me confused . As an example my 09 2500 hd has a gvw of 9200lbs , The tire inflation label on the door calls for 60psi front and 72psi rear, gvw for front is 4800and 6084 rear the tires call for max of 80 psi . So if I was loaded to 9200 gvw my front tires would be carrying 2400lbs ea. and the rear 3042lbs ea.So why do the tires on a tandem axle Airstream need 80psi on a E rated tire ? Wbcci #14183 Les from Ohio
It is common for trailers to have barely enough load carrying capacity - so they call for the maximum inflation pressure. Put another way, trailer ought to use much larger tires than they do. (with some exceptions).

On the other hand, trucks have tires that are rated to higher loads than they need. They don't need to use all the capacity, so they use a lower inflation pressure. Note that if you add the front and rear GAWR's, you get a value that is higher than the GVW.
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Old 06-02-2013, 07:17 AM   #22
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So why do the tires on a tandem axle Airstream need 80psi on a E rated tire

On any tire used on any trailer: the side-shear forces seen by such calls for maximal stiffness that the tire does not detach from the rim, or, long-term, degrade the sidewalls such that failure chances increase. Maximum pressure, therefore.

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Old 06-02-2013, 08:27 AM   #23
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I installed five of the Michelin LTX (P) 235/75R15 XL tires using the OEM aluminum wheels on my 2013 International Serenity 25FB with a GVW of 7,300 pounds. Each of the trailer axles are rated 3,600 pounds. These tires have a weight rating printed on the sidewall of 2,183 pounds @ 50 psi. Per 49 CFR 571.110, when these tires are used in non passenger type vehicles, the load capacity must derated to 1,985 pounds (10%). That Michelin tire diameter is 28.9" as compared to the GYM ST225/75R15D tire diameter of 28.3". If the tire weight rating for two tires exceeds the axle rating on the vehicle door plate, the weak link in the support chain would in theory be the axle. I run 50 psi in these tires.

Many in the tire wars threads switched to the same tire and wheel Airstream used on the Eddie Bauer trailers. Those are the Michelin LT 225/75R16E LTX M/S2 tires rated 2,680 pounds at 80 psi. These tires are 29.2" tall, or 0.9" taller than the GYM ST tires. The SenDel T03-66655BM aluminum wheel was used by Airstream. That black high lighted wheel has been discontinued. The plain aluminum wheel part number is T03-66655T.

My 3/4 ton Dodge has a rear axle rated at 6.010 pounds and the two factory installed Michelin LT265/70R17E rear tires at 70 psi are rated at 6,010 pounds. At 80 psi they are rated at 6,390 pounds. I would think the factory considered a safety margin in there somewhere when selecting these tires. The front axle is rated 5,500 pounds and the recommended tire pressure is 45 psi for the two factory installed Michelin LT265/70R17E tires to generate a two tire capacity of 5,510 pounds.

Nothing like real numbers from the items in question.
Thanks or the real skinny! There is a lot of misinformation out there.
I switched to Michelins two years ago after multiple ST tire failures suffered during multiple day, hot weather interstate trips and have forgotten about tire problems. For a lighter two axle or any three axle trailer 15 inch Michelins (or like rated s.o.b.'s) are the way to go. If I had a heavier trailer, I would upgrade to 16 inch wheels and heavier LT tires.
Frankly, I don't know why we are still having this debate. Marathons, Chinese made, U.S. made, it is all irrelevant, the fact is any ST tire will prematurely fail if towed at freeway speeds in very hot weather.
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Old 06-02-2013, 09:08 AM   #24
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"So a P235/75R15XL is a P metric tire."

Yes, exactly. But the confusing thing is that the Michelin name for this tire is the "LTX". Same name they use for their E rated LT tires in larger wheel sizes ( I have them on my truck). I assume the original poster thought because of that name he was actually getting a LT tire. I thought that at first because the last set I had with the same name were LT tires.
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Old 06-02-2013, 11:12 AM   #25
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It's great to share experiences on this forum. The ST vs LT dialogue gets clouded, though, when individuals share personal experiences and express such as absolute universal "facts". Controlled testing and statistical data is lacking. My personal experience was that my original 14" Marathons rolled for over 23,300 miles without problem, and as I look at them now de-mounted, they show no signs of abnormal wear whatsoever. They rolled at 60 mph across OK and TX freeways at over 100 ambient for two summers, and rough mountain roads in all seasons. Was it luck or careful maintenance and operating within load and speed parameters? My decision to upgrade to 15" Michelin LTX was based upon several factors, including manufactures recommendations on the life span of ST tires. I'm really happy that they fit on my FC23FB and look forward to years of service from them.

Quote:
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Thanks or the real skinny! There is a lot of misinformation out there.
Marathons, Chinese made, U.S. made, it is all irrelevant, the fact is any ST tire will prematurely fail if towed at freeway speeds in very hot weather.
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Old 06-11-2013, 03:51 PM   #26
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Switching to 16 inch wheels and LT tires

I just ordered 4 Sendel T03 66655st wheels from Tredit and will pickup tomorrow. Now the tougher debate as to which LT tire to match to these wheels. I have narrowed my choices to either Michelin or Bridgestone.

Michelin LTX M/S 2 $245.00 29.2 dia 38.2 lbs

Duravis R250
(steel casing) $223.00 29.4 dia 52 lbs

Duravis M895
(steel casing) $225.00 29.4 dia 53 lbs

Duravis R500 HD 183.00 29.2 dia 41 lbs


Any opinions or suggestions?
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Old 06-11-2013, 05:00 PM   #27
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Michelin LTX M/S 2's are the best tires I have ever had, including on my pickup truck, they wear like iron and I would definately recommend them. More money, but more trust.

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Old 06-11-2013, 06:27 PM   #28
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If you look around, many dealers are offering a $70 rebate on the purchase of 4 Michelin tires if you act before month end. At this point my only experience is with the Michelin's.

Last June I got my LTX M/S tires for $202 each with free shipping from Discount Tire Direct. And that price was before the $70 rebate.

Jack
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