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Old 10-21-2014, 04:14 PM   #71
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Slow'

We've traveled 1200 miles so far on Michelin 16" this trip with 65 psi, the last 250 on I40 with plenty of semi's. 2012 Ram 1500 full coil springs 120" wheelbase and ProPride hitch.

Excellent weather, little crosswind but semi's passing have no push and there is no sway felt at this point. That is a small sampling, adding to what others have reported, but I believe we may have resistance to sway, reliable service, and a soft ride in our sights unless there is a change in our "good luck".

I will report as we move along.
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Old 10-22-2014, 05:42 AM   #72
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We are the consumers trying to sort all this out........
It's very complex and it's easy to get lost in the details.

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...........Tireman, that makes sense but is rebutted by 2nd generation Airstream dealer Andrew Thomson who has equipped hundreds of Airstreams with Michelin LT tires set at lower pressures for gentler ride, better braking, and better wear for thousands of miles without reported failures of this type.

We are well aware of common tread separation failures on Good Year Marathon ST tires but none on 16" Michelin LT tires used at various pressures on our Airstreams. That is why we have chosen to use them., and most probably why Airstream is equipping large and premium models with them......
Correct me if I am wrong, but isn't everyone is replacing 15" Goodyear Marathons with 16" Michelins or ST235/80R16's with LT235/85R16's - both of which are increases in tire size - and directionally that is the right way to go for durability improvements. In some respects this is more a comment about the sizing of the tires and not the brand.
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Old 10-22-2014, 06:13 AM   #73
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It's very complex and it's easy to get lost in the details.



Correct me if I am wrong, but isn't everyone is replacing 15" Goodyear Marathons with 16" Michelins or ST235/80R16's with LT235/85R16's - both of which are increases in tire size - and directionally that is the right way to go for durability improvements. In some respects this is more a comment about the sizing of the tires and not the brand.
Are you defending st tires?
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Old 10-22-2014, 06:53 AM   #74
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Correct me if I am wrong, but isn't everyone is replacing 15" Goodyear Marathons with 16" Michelins or ST235/80R16's with LT235/85R16's - both of which are increases in tire size - and directionally that is the right way to go for durability improvements. In some respects this is more a comment about the sizing of the tires and not the brand.
Actually, no. Most are replacing ST225/75R15D's with LT225/7516E's
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Old 10-22-2014, 07:42 AM   #75
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I know of no Airstream trailers that can fit ST235/80R16's or LT235/85R16's.
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Old 10-22-2014, 08:59 AM   #76
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dkottum asks what other Airstreamers are running for tire pressure with their 16" LT tires. The max pressure at 80 psi makes for a pretty bouncy ride for our trailers. We used to say if you want your one ton pick up to ride smoother, put a ton of weight in the bed. These trucks are pretty bouncy unloaded. So we would reduce tire pressures to soften the ride when unloaded.

I can only imagine all the factors that go into a tire pressure selection for a trailer. I suspected Ford Explorers rolled over years ago due to low tire pressure (lack of maintenance by the owners.) I felt the same with GYM ST 15". I ran GYM 15" ST load C tires for five years without problems. I wonder what the actual failure rate percentage of total was for those tires? I see ST tires on nearly all the trailers I look at, e.g. hard working utility trailers with skid steers on them. ST trailer tires can't be all that bad.

But dkottum asks, and I'm listening, what other Airstreamers are running for tire pressures, and what problems might be happening. Anecdotal experiences can be helpful. "The truth is more important than the facts".

So based on this thread I am more comfortable running 65 psi in my LT 16" Es. I've got 4000 miles on them with no problems.

David
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Old 10-22-2014, 09:42 AM   #77
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I am running at 76 lbs in my LT225r16 Michelins. They currently have 78,000 k on them. I had the axel aligned last week because 1 tire was wearing on the outside edge. There is no logic behind the 76 lbs except that it works for me and it is easy to remember because the Airstream rolls at 7600 lbs and I adjust the pressure upwards by a lb or two when heading out for a longer trip and my wife has the thing loaded with all her junk. I don't have any junk. Jim


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Old 10-22-2014, 09:51 AM   #78
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Some time ago there was a thread and poll here comparing the failure rate of various trailer tires. There were no failures reported on Michelin 16" LT used on Airstreams. The original GYM's were much worse as I recall.

Nobody likes flat tires so that inspired me to make the switch to Michelin 16"s as well. Now if we could find a good overall tire pressure to use based on members' experiences, that is, actual use on Airstreams. So far it looks like the range of 65 to 80 psi is working well.

We paid a bundle for this Airstream so I want to take care of it, I don't want to wreck it or shake it to pieces. For our FC 25 carrying 6520# on the axles when attached with weight distribution applied, using LT tire load chart it looks like 65 psi allows 15% for variations and another 10% of that for grins so that's what we are using.

So far it handles without fault, and the ride feels less harsh from the driver's seat than at 80 psi. As for sway or semi push we don't have any, it's the same as with 80 psi. We use a Hensley/Propride style hitch and that is significant here.

Am hoping to get more actual pressure and experiences noted by those using 16" Michelins on their Airstreams.

We're touring some Presidential Libraries this trip, very interesting look at American history. Lincoln last week, Clinton in Little Rock today.
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Old 10-22-2014, 11:29 AM   #79
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Originally Posted by dkottum View Post
We are the consumers trying to sort all this out.

Tireman, that makes sense but is rebutted by 2nd generation Airstream dealer Andrew Thomson who has equipped hundreds of Airstreams with Michelin LT tires set at lower pressures for gentler ride, better braking, and better wear for thousands of miles without reported failures of this type.

We are well aware of common tread separation failures on Good Year Marathon ST tires but none on 16" Michelin LT tires used at various pressures on our Airstreams. That is why we have chosen to use them., and most probably why Airstream is equipping large and premium models with them.

Somewhere we consumers have to find a truth in this apparent conflict in theory and practice.
Given the current state of affairs in the rest of the RV trailer market where low cost components is the majority ( not so much in the premium Airstream market) where low price is the primary requirement to make a sale of tires to the RV assembler, I am not surprised that the response is different here than on other forums. BUT you should not confuse the results of ST type tires with those of LT type tires.

It is apparent that Airstream has designed some of their trailers to allow for lighter weight units (no slide-outs etc) but also to allow room for larger LT type tires. If you want to use LT rather than ST type tires you will need larger size tires or significantly higher tire pressure. I specifically wrote about how to do this switch on July 15 2014 in my blog.

If you apply a sufficiently large tire the forces that cause failures will be lower than when you use the smaller tire that has a lower margin of safety.

I'm not sure how to answer questions about what inflation to run without offering "best practice" advise.

Now I'm glad to hear that your dealer has never sold a unit that suffered a tread separation tire failure. Maybe the answer is for everyone to simply buy from him and not worry about inflation levels and to ignore advise based on engineering principles. (end of sarcasm)

Seriously though, I would like fellow RV owners to have fewer tire problems. That is why I write a blog just on RV tire applications and why I give free seminars on the topic and why I post to 11 different forums.

So how would you answer the question on what is the proper inflation to run on all Airstream trailers? and Why?
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Old 10-22-2014, 11:55 AM   #80
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What pressure do you use 16" Michelin

All the facts, truths, and even questionable anecdotes are interesting, but in no way transferable from one trailer/tow vehicle combination to another, and perhaps even from one day to another on the same setup. So although, these numbers are interesting to know as a comparison to your own practices, they cannot be interpolated or extrapolated for your own use.

This is my opinion and I'm sticking to it right or wrong:
The only sure way to arrive at the optimum pressure is to first know how much your trailer weighs in its current configuration (attached with weight distribution set) to the tow vehicle. Take that weight and divide it by the number of tires (presumably, you have taken care to load the trailer reasonably balanced). Increase that weight by the 15% factor "Capri racer" recommends because you are using truck tires on a trailer. Then take that resulting weight to the tire manufacturer's load/pressure table to find the proper inflation pressure. If your adjusted weight is more than the table covers, then don't carry that much weight or get bigger tires.

This is in my mind the most important of all:

Then on any given trip, monitor the pressure and temperature with a TPMS to ensure you are staying within the limits recommended by those here that know more than I. I do this step. The first part above , I do to some degree. The monitoring to me is the most important, because it will tell you that you didn't do the calculating part correctly, before there is failure.

Ken

P.S. as far as beating up the trailer is concerned:
The only time I have experienced that is when the road has been so rough that I do not believe lower tire pressure would have done any good at all.
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Old 10-22-2014, 12:07 PM   #81
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For reference, could someone post links to the load/pressure tables for the Michelin LTX tires that many Airstreamers are switching to:

for those who have upsized from 15 to 16 inch:
LTX MS2 225/75R16E

for those who have upsized from 14 to 15 inch:
LTX MS2 235/75R15E
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Old 10-22-2014, 12:14 PM   #82
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For reference, could someone post links to the load/pressure tables for the Michelin LTX tires that many Airstreamers are switching to:

for those who have upsized from 15 to 16 inch:
LTX MS2 225/75R16E

for those who have upsized from 14 to 15 inch:
LTX MS2 235/75R15E

Here's a start. There is also a note that says if the tire you have is not listed, contact a dealer.

Load & Inflation Tables | Michelin Truck

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Old 10-22-2014, 12:24 PM   #83
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Ken: I've seen those tables before, the LTX tires aren't listed.
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Old 10-22-2014, 12:32 PM   #84
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Ken: I've seen those tables before, the LTX tires aren't listed.
When I searched "michelin truck tire load pressure tables" using Google
I got a whole mess of links. If you don't want to wade through all that, I guess the fallback is contact a dealer, or perhaps when someone else here see's this, they will know more than I.

Try Page 22 in this document:

http://www.michelintruck.com/assets/...k_Sept2011.pdf

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