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Old 10-13-2013, 08:30 AM   #29
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Originally Posted by ROBERT CROSS View Post
Four new "good-for-a-years" at seven years...$530. Got three more years to go...goodness me, what shall I do?

Bob
How many miles?
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Old 10-13-2013, 09:36 AM   #30
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There is no change to the axles when switching from the OEM GYM ST225/75R15D 15" tires and OEM wheels to the factory installable 16" SenDel T03-66655T wheels and Michelin LT 225/75R16E LTX M/S2 tires.

However, the OEM 15" tire diameter is 28.3" while the 16" Michelins are 29.2" in diameter. Thus one gets another 0.45" of ground clearance.

The load rating of the OEM tire is 2,540 pounds @ 65psi and a speed limit of 65mph. The Michelin 16" tires are rated 2,680 pounds @ 80psi with no speed restrictions.

I converted the five tires on the 2013 25FB International Serenity to the Michelin LTX (P) 235/75R15 XL tire mounted on the OEM wheel and had plenty of reserve. The tires were typically supporting less than 6,000 pounds when the trailer was loaded for camping versus the derated load capacity of 7,940 pounds. The Michelin tire is wider and runs at lower pressure so there is more tread contact for braking.

See tire comparision photo in my "Images: to the left.
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Old 10-13-2013, 10:02 AM   #31
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Question

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Originally Posted by dkottum View Post
How many miles?
Seven years worth of miles.

Covered during the Season....

Off during storage....


Is the LT/16 group using time, milage or both?


Bob
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Old 10-13-2013, 06:13 PM   #32
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Here is where I am on this tire thing

I bought the Sendel T03 wheels from the manufacturer on Ebay ($122 including shipping) and some nice chromed metal valve stems that fit nicely with my external TPMS.

Now this is where it gets interesting. I called Airstream's technical support line and asked, "Why did you guys choose the Michelin tires as the factory upgrade?" His reply was, "Because they are made in America." I said, "That's odd! Tirerack says they are made in Germany!" He said he would ask one of their engineers and call me back. He never did. I double checked and the Michelins are truly made in Germany.

I called Tirerack and asked to speak to a "tire expert." I asked him to show both the Michelin XPS Rib tires and the Kumho Road Venture APT KL51 on his screen for the needed 225 75 R16 tires. I then had him read the fine print on each tires specifications. Here are the differences:
1. The Kumhos are 0.1 inch smaller in diameter.
2. The Kumhos weigh 37 lbs each, the Michelins weigh 49 lbs each.
3. The Michelins say, "Highway Rib Summer tires are not intended to be driven in near-freezing temperatures, through snow or on ice."
4. All other specifications related to load, speed, warranty, etc. are identical.
5. Lastly, the Michelins are $292 each plus shipping and the Kumhos are $115 plus shipping.

I spoke to my friend, Paul, down in Decatur, TX and discussed these Michelin tires. Paul does Airstream service. He said, in his experience, the sidewalls are very heavy on them (probably accounting for the additional weight). In addition, two trailers he is familiar had the Michelins installed in 2008 and now have sidewall cracks severe enough that the tires now need to be replaced. He indicated that these tires had run in excess of 100,000 miles and still had plenty of remaining tread. Interesting! The tread outlived the sidewalls!

Just to let y'all know, I am a Mechanical Engineer. I used to be registered in 5 states until I retired recently.

So here is what I did: I considered everything I know and I ordered the Kumhos.

I've blown out a total of 6 Goodyear Marathon's (the tire recommended and installed by Airstream) over the last two trips and I decided the Kumhos were worth the risk.

Discussion?
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Old 10-13-2013, 06:40 PM   #33
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I'm not a mechanical engineer so I looked for experience with GYM's, 16" Michelins, and a few others. Don't remember seeing anything about Kumhos.

We travel far from home, often to remote areas or busy interstates, not where I want a tire with frequent unreliability. Or unknown reliability. The best experience I've seen has been with 16" Michelins, have not seen a blowout reported and they are providing long service life.

Airstream is offering them as an upgrade which indicates they approve. Airstream does not use Kuhmos or other less expensive 16" tires as standard equipment on their Eddie Bauer model, they use Michelins even though they could get by cheaper.

Using this reasoning, I put on four 16" Michelins, kept the original spare, and sold the near-new GYMs. We now travel with confidence in our tires, which we did not have before.
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Old 10-13-2013, 09:18 PM   #34
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One Last Thing

The fact that GYM's are trailer-rated with a speed limit of 65mph tells you something about trailer tires, in general. They aren't even rated for "human conveyance."

Both the Kumhos and the Michelins are light truck tires and built to a much higher standard. My only concern with truck tires rated E is the load rating of 2680 pounds @ 80psi. E-rated tires now encompass what used to be called "10 ply." The old exploding GYM's were load rated 2540 pounds @65psi and load rated D and have really soft side walls.

I'll study the load vs inflation charts to match up the recommended load on the new Kumhos and try to keep from shaking the interior doors off their hinges!

I'll keep y'all posted.
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Old 10-14-2013, 05:39 AM   #35
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Wink

Not surprising, Airstreams aren't "rated" for human transport either.
I believe ST tires are made to be used on trailers.

Our TV Michelin's are E's but, never have been loaded to 80psi.

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Old 10-14-2013, 03:19 PM   #36
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Quote:
Originally Posted by farrel509 View Post

Now this is where it gets interesting. I called Airstream's technical support line and asked, "Why did you guys choose the Michelin tires as the factory upgrade?" His reply was, "Because they are made in America." I said, "That's odd! Tirerack says they are made in Germany!" He said he would ask one of their engineers and call me back. He never did. I double checked and the Michelins are truly made in Germany.
Reading this made me curious, I looked at the OEM Michelins on my 2012 EB and all of them were made in Canada.
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Old 10-14-2013, 03:56 PM   #37
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Quote:
Originally Posted by farrel509 View Post
I bought the Sendel T03 wheels from the manufacturer on Ebay ($122 including shipping) and some nice chromed metal valve stems that fit nicely with my external TPMS.

Now this is where it gets interesting. I called Airstream's technical support line and asked, "Why did you guys choose the Michelin tires as the factory upgrade?" His reply was, "Because they are made in America." I said, "That's odd! Tirerack says they are made in Germany!" He said he would ask one of their engineers and call me back. He never did. I double checked and the Michelins are truly made in Germany.

I called Tirerack and asked to speak to a "tire expert." I asked him to show both the Michelin XPS Rib tires and the Kumho Road Venture APT KL51 on his screen for the needed 225 75 R16 tires. I then had him read the fine
print on each tires specifications. Here are the differences:
1. The Kumhos are 0.1 inch smaller in diameter.
2. The Kumhos weigh 37 lbs each, the Michelins weigh 49 lbs each.
3. The Michelins say, "Highway Rib Summer tires are not intended to be driven in near-freezing temperatures, through snow or on ice."
4. All other specifications related to load, speed, warranty, etc. are identical.
5. Lastly, the Michelins are $292 each plus shipping and the Kumhos are $115 plus shipping.

I spoke to my friend, Paul, down in Decatur, TX and discussed these Michelin tires. Paul does Airstream service. He said, in his experience, the sidewalls are very heavy on them (probably accounting for the additional weight). In addition, two trailers he is familiar had the Michelins installed in 2008 and now have sidewall cracks severe enough that the tires now need to be replaced. He indicated that these tires had run in excess of 100,000 miles and still had plenty of remaining tread. Interesting! The tread outlived the sidewalls!

Just to let y'all know, I am a Mechanical Engineer. I used to be registered in 5 states until I retired recently.

So here is what I did: I considered everything I know and I ordered the Kumhos.

I've blown out a total of 6 Goodyear Marathon's (the tire recommended and installed by Airstream) over the last two trips and I decided the Kumhos were worth the risk.

Discussion?
The Michelin Rib is not needed its overkill the Lt's are what everyone has been using with no drama.Why after all the trouble you have had would you buy some tire that is unproven on your Airstream?
By the way tires should be replaced every 5-6 years even if they are not driven 1 mile as rubber deteriorates.Most people are unaware of this and will argue but its a well known fact.Also even the Lt's have a thicker sidewall than most tires which is a good thing for our trailers as the have a tendency to scrub on tight turns.Oh well, Good luck with the new tires.
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Old 10-14-2013, 06:32 PM   #38
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Thumbs up

Hard to say for sure if the "country of origin" is actually the country of manufacture...but makes for good reading nonetheless.
List of tire companies - Wikipedia, the free encyclopedia

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Old 10-14-2013, 10:04 PM   #39
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Hard to say for sure if the "country of origin" is actually the country of manufacture...but makes for good reading nonetheless. List of tire companies - Wikipedia, the free encyclopedia Bob
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Old 10-14-2013, 11:45 PM   #40
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Would one of you 16 inch light truck tire guys explain the reasons you are switching. I can understand getting rid of the Goodyear Marathons but do you think it best to go to a LT tire really designed for that, light truck, with a secondary use as a trailer tire for very heavy loads. The trailer tire is designed exclusively for trailers, giving a soft ride, good traction and tread design, tougher sidewalls--hitting curbs, etc. Why not stay with your 15 rims and put on a very well respected tire like the E rated Maxxis 8008. That gets you 10 ply, 80# and what? I think 2800+ lbs of muscle each. ????

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Old 10-15-2013, 12:09 AM   #41
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I"d like to also know why not just go with new 15 inch LT tires on the new rims , I"m leaving in a few days to go pickup my new 2013 27 FB int in California , I'm pretty sure I'm going to swap out the tires , keep my Rims ,

Look at how many AS trailers and all them miles on 15 inch rims , been around

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Old 10-15-2013, 01:15 AM   #42
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I"d like to also know why not just go with new 15 inch LT tires on the new rims , I"m leaving in a few days to go pickup my new 2013 27 FB int in California , I'm pretty sure I'm going to swap out the tires , keep my Rims , Look at how many AS trailers and all them miles on 15 inch rims , been around Opinions
Dutchie,
Oh how I wish it were that easy! Tire manufacturers now no longer make a light truck E-rated radial tire that will fit the original Airstream wheels.
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