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Old 02-04-2016, 03:08 PM   #197
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There is a clear picture of a Michelin tire posted in post 135. It says

Max load 2183
Max pressure 50 psi.

So the tire (when mounted on a SUV) will support 2183 lbs at 50 psi. True or False?

It will also support 2183 at 44 psi if it meets the tire association guidelines?

Or is the max load at 50 psi pressure lower than the max load at some lower pressure?

OP- Sorry, this does not deal directly with the Defender but it does with a likely very similar tire that is currently being used and that works well on Airstreams.
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Old 02-05-2016, 04:52 AM   #198
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Just to clarify what is our practice over a couple of thousand of these tires over the last 12 years.

When we are running them at or near max load, 19' or 22 Single axle, older 30' Classics, 30 Internationals with upgrades we run them at 50 PSI. They never run warm, flats are extremely rare and I have never seen a shifted belt.

On lighter trailers where they are running well below maximum load such as 23's and 25's we run them 40-45 PSI just to smooth out the ride in the trailer. On a vintage trailer that we are trying to preserve we will weigh the trailer and run them at the load capacity chart pressure. The theory is we would rather compromise the tire life than the trailer structure. On these we are often 30-35 PSI. We don't have a large volume of these out there.

Last summer I used a 27FB for my demo and since we were driving some rough roads at higher speeds I ran the Michelins at 40 PSI. They ran cool as cucumber even at that pressure, I may have given up a touch of fuel mileage though.

I am sure there are other 235 LT tires out there that will work well also I just am reluctant to change when we have such a great track record with these.

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Old 02-05-2016, 06:50 AM   #199
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Thanks for the clarification. Experience counts, on the road use counts. Thanks again.
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Old 02-05-2016, 07:00 AM   #200
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Quote:
Originally Posted by Bill M. View Post
...... So the tire (when mounted on a SUV) will support 2183 lbs at 50 psi. True or False? ........
False, but not for the reason you think. On an SUV, the tire has to be derated by a factor of 1.1, so the max load would be 1985#.

But to try to answer the question as you intended: In one sense it is true. The tire will support that load at 41 through 50 psi.

Quote:
Originally Posted by Bill M. View Post
...... It will also support 2183 at 44 psi if it meets the tire association guidelines? .........
Yes.


Quote:
Originally Posted by Bill M. View Post
...... Or is the max load at 50 psi pressure lower than the max load at some lower pressure? .........
No, but to be clear, if you use a pressure lower than 41 psi, the max load is lower, but between 41 psi and 50 psi, the max load is 2183# (or 1985# depending on what vehicle it is on).

On a personal note: I'm glad Michelin stated it the way they did. To state it like a relationship is somewhat misleading.
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Old 02-05-2016, 07:09 AM   #201
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And on a side note:

I think it is best if everyone weighs their trailer - tire by tire if at all possible.

I also think everyone should pay attention to pressure buildup. No more than 10%!

When I was actively racing, part of my "Before Leaving" checklist was to do tire pressures on the tow vehicle, the race car, and the trailer. If I stopped along the way, I did a quick check of the tow vehicle and the trailer. I think everyone should have a checklist and tire pressures ought to be on it!
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Old 02-05-2016, 07:19 AM   #202
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So what then - if anything - happens to factors other than load when at 42-50 PSI?
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Old 02-05-2016, 02:39 PM   #203
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My guess would be it is limited to tire wear & fuel economy.

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Old 02-06-2016, 06:35 AM   #204
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Seems this is getting confusing, wasn't this thread about the new defender tire!
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Old 02-06-2016, 07:57 AM   #205
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Quote:
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Seems this is getting confusing, wasn't this thread about the new defender tire!
Yes, but the new Defender is also an Extra Load (XL) tire, so this discussion of pressure is relevant.
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Old 02-06-2016, 08:06 AM   #206
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So what then - if anything - happens to factors other than load when at 42-50 PSI?
If by "factors" you mean "performance properties", then:

a) The tire will tend to wear in the center more, but trailers hardly wear tires at all, so this shouldn't be a concern.

b) The tire will have a higher spring rate, which means more impact force will be transmitted through the suspension.

c) The tire will tend to more follow the ruts and grooves in the road.

d) The tire will tend to be more resistant to cross winds.

e) The tire will run cooler - which I don't think is such a big deal unless the heat generation was a problem to begin with

f) The tire will have more speed capability - and that translates into more resistance to failure.

I think that about covers it.

Edit: I forgot to say that fuel economy will be better, but only marginally so.

Quote:
Originally Posted by avionstream View Post
Seems this is getting confusing, wasn't this thread about the new defender tire!
It was (is?), and this part is discussing what it means when a P type tire states a load and inflation pressure on the sidewall - and the Michelin Defender is such a tire - especially considering this tire is being used to replace an ST tire, where things are stated differently.
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Old 02-06-2016, 10:10 AM   #207
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Thanks. Very helpful. I see you didn't mention anything about "interplay shear" we hear a lot about with double (or triple) axle trailers. In your view - does max pressure (50 psi in this case) offer an advantage there?


I may try mine at 45 PSI this season and see what differences that makes.

Thanks again!
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Old 02-06-2016, 12:36 PM   #208
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SUV or Trailer

[QUOTE=CapriRacer;1745307]False, but not for the reason you think. On an SUV, the tire has to be derated by a factor of 1.1, so the max load would be 1985#.

But to try to answer the question as you intended: In one sense it is true. The tire will support that load at 41 through 50 psi.



Yes.




No, but to be clear, if you use a pressure lower than 41 psi, the max load is lower, but between 41 psi and 50 psi, the max load is 2183# (or 1985# depending on what vehicle it is on).

Greetings,,

I have been reading this thread from the begining, over and over and I have to admit that the longest this thread goes the more confused It gets. I thought it has been mentioned before in a previous posting that this thread was exclusively about the performance of these tires on a trailer, air presuure, loads, derating the max load , and so on. But here, quote, " the max load is 2183# (or 1985# depending on what vehicle is on)
So this tire gets derated on a SUV use? or a trailer use?, please explain
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Old 02-06-2016, 12:43 PM   #209
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So this tire gets derated on a SUV use? or a trailer use?, please explain
Tires not designed for the application should be derated as they are being used on a different application than what was designed.

A passenger tire (The size starts with a P) is designed for a passenger car or some light truck. If the user installs on a non-passenger car the rating was not created for that application. derate it

LT is for light truck application

ST is for trailer application

The tire in question is a P tire.

This is the issue with off topic threads and long threads. Instead of creating a new thread posts are made that are related to the main topic just not the thread topic. In this case the thread topic is Michelin Defender LTX M/S 235/75-15 109T XL. However the answer was made to the tire pictured in post 135. That picture is of a P rated tire, which on a SUV is an application of a tire to a vehicle it was not designed for. A LT tire is designed for a SUV. A "P" tire is not designed for a SUV or light truck application.

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Old 02-06-2016, 12:48 PM   #210
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Meaning it's load capacity should be de-rated by 10%. I'm pretty sure we've already established that at least 3 times in this FrankenThread I started .

There's really little more to say on this topic until the tires are available, hopefully in March. Thanks for playing, everybody!
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