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Old 11-18-2015, 09:32 PM   #15
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I checked out the difference in tire weight and found a big difference. That was enough to show me the difference.
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Old 11-18-2015, 11:37 PM   #16
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There's a new 15 inch Michelin

Quote:
Originally Posted by avionstream View Post
What about the 15 inch michelins?
Some people have been using the 15 inch Michelin model LTX MS/2 P235/75-15 108T XL. It is rated for 2183 pounds.

This tire has been around for a number of years. Michelin is replacing the LTX MS/2 with a new tire called Defender LTX M/S. The 15 inch Defender LTX is once again a passenger type tire, not an LT tire, but its load rating is higher. The tire designation is 235/75-15 109T with a load rating of 2271 pounds.
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Old 11-19-2015, 05:34 AM   #17
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Good info on the new tires. Thanks.
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Old 11-19-2015, 05:39 AM   #18
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So derated those Defenders would carry 2064# per tire.
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Old 11-19-2015, 05:46 AM   #19
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And that would be enough for my Avion and probably some larger AS.
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Old 11-19-2015, 09:29 AM   #20
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When I did the 15" stock GYM ST225/75R15D tire swap to 15" Michelin LTX (P) 235/75R15 XL tires on our 2013 25FB International Serenity, the Michelin sidewalls had a rating of 2,183 pounds.

Per the federal regulation below:

49 CFR 571.110
Tire selection and rims and motor home/recreation vehicle trailer load carrying capacity information for motor vehicles with a GVWR of 4,536 kilograms (10,000 pounds) or less.

S4.2.2.1
Except as provided in S4.2.2.2, the sum of the maximum load ratings of the tires fitted to an axle shall not be less than the GAWR of the axle system as specified on the vehicle's certification label required by 49 CFR part 567. If the certification label shows more than one GAWR for the axle system, the sum shall be not less than the GAWR corresponding to the size designation of the tires fitted to the axle.

S4.2.2.2
When passenger car tires are installed on an MPV, truck, bus, or trailer, each tire's load rating is reduced by dividing it by 1.10 before determining, under S4.2.2.1, the sum of the maximum load ratings of the tires fitted to an axle.

S4.2.2.3
(a) For vehicles, except trailers with no designated seating positions, equipped with passenger car tires, the vehicle normal load on the tire shall be no greater than 94 percent of the derated load rating at the vehicle manufacturer's recommended cold inflation pressure for that tire.
(b) For vehicles, except trailers with no designated seating positions, equipped with LT tires, the vehicle normal load on the tire shall be no greater than 94 percent of the load rating at the vehicle manufacturer's recommended cold inflation pressure for that tire.


We derated the operational load capacity to 1,985 pounds or 7,940 pounds for four of them. Our loaded for camping trailer axle load was 5,860 pounds with a total trailer weight of about 6,935 pounds of it's 7,300 pound GVW rating.

The 7,940 load rating was inadequate for our Classic when loaded for camping as the Classic exceeds that number on the axles when camping ready. Thus we installed the 16" Michelin LT225/75R16/E LTX M/S2 tires on 16" SenDel T03-66655T wheels.

The 27/28 models have a 7,600 pound rating which is easily within the capabilities of these tires. The 27FB Eddie Bauer model has a 7,800 pound GVW and would start crowding the safety margin for the 15" Michelins. However, the factory offered the 16" Michelin LT225/75R16/E LTX M/S2 tires mounted on SenDel T03-66655T wheels as an option for that model and made them standard on 2015 and later Classics. The 16" tire and wheel combination just mentioned is for sale at Jackson Center for most recent 25" and longer Airstreams and on display just after you pass through the doors of the service center.

I replaced the stock 14" GYM ST215/75R14C tires with the 15" Michelin LTX (P) 235/75R15 XL tires mounted on SenDel T03056545T wheels on the 2015 23D International Serenity for a better load capacity and reliability. That 15" combination will also raise the trailer to the same elevation as the 25FB was since we are using the same Mercedes to tow the 23D that we used for the 25FB.
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Old 11-19-2015, 09:30 AM   #21
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Quote:
Originally Posted by Al and Missy View Post
I may be mistaken, but the 15" Michelin tires are technically not LT (Light Truck) tires. Their nomenclature starts with P225, meaning they are a passenger car tire. Michelin rates them for light truck use but they must be de-rated 10% for that service. I went with 16" Michelin LT tires because at 75 psi they had slightly more load carrying capacity than the 15" ST tires on my trailer (which had substantial margin against the 6300# GVW of my trailer).

There are arguments that state that the ST tires are designed to survive the torsional stress imposed on the tires of a tandem wheel trailer. I think the nearly 100% margin I have at 75 psi should be sufficient. Only time will tell.

Al
You are correct, the are P rated. The "LTX M/S2" is the line. And I believe the size run in 15's is P235/75R15XL - P denotes passenger and the XL denotes extra load.
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Old 11-19-2015, 12:43 PM   #22
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A P235/75R15 is rated for 2023 lbs at 32 psi. People use these on 4, 5, and 6 thousand lb SUVs all day long without any problems. So, four of these wil hold up a 8092 lb Airstream at 32 psi. On a lighter Airstream the pressure could be reduced to keep the tire at proper inflation for the weight and to smooth the ride even more. Seems to me that a 65 psi LT tire would needlessly shake an Airstream apart. As for a speed rating, just get on any Texas four lane. Not to mention they are much cheaper!!!
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Old 11-19-2015, 12:50 PM   #23
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Quote:
Originally Posted by mykytiukr View Post
A P235/75R15 is rated for 2023 lbs at 32 psi. People use these on 4, 5, and 6 thousand lb SUVs all day long without any problems. So, four of these wil hold up a 8092 lb Airstream at 32 psi. On a lighter Airstream the pressure could be reduced to keep the tire at proper inflation for the weight and to smooth the ride even more. Seems to me that a 65 psi LT tire would needlessly shake an Airstream apart. As for a speed rating, just get on any Texas four lane. Not to mention they are much cheaper!!!
Please don't post WRONG information. See above, Switz's post, those tires have to be derated for the application.
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Old 11-19-2015, 01:21 PM   #24
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2 ST tire failures and reading 100's of posts on Airforums caused me to upgrade to 16" wheels and LT tires.
The factory has followed suit, making 16' wheels/LT tires standard equipment on Eddie Bauer and Classic trailers and optional on others.
Apparently, the factory engineers have "drank the Kool-Aid".
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Old 11-19-2015, 02:47 PM   #25
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Not a tire salesman,, trust me.

We live in a RR area of nw Kansas.. Mostly dirt all roads other than the 2 hiways that cross our county.. Back in the 1920s and 1930s a lot of farm steads were sold and taken down or buildings just drug on skids to another farm for a added building.

Due to this Im sure our roads are loaded with nails,, chunks of iron and such too the point that any lower cost tire will have a flat weekly if not daily.. I always felt that a name brand tire was just that and it was mostly a Chevy or Ford battle between them..

But I will state, when I am running Michelins I might get 1 or 2 flats in the life of 4 tires where any other brand no matter what they cost seem to have flats all the time. I have even chopped up used tires to study how they are made and I cant tell any difference between a Goodrich or Goodyear in relation to a Michelin..

I have 50k on my set for my Ram,, and so far not 1 flat yet.. ( knock on wood)

So the first thing I did when we got home with our 72 Overlander was fit her with a fresh set of Michelins LT tires.. and I never have too look back and worry.. Sodbust
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Old 11-19-2015, 05:08 PM   #26
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Thanks everyone for responding to my thread. A lot of information shared here & I appreciate it. For the near future I'll keep the Marathons, keep them properly inflated, maintain my 65 mph maximum driving speed & see how it goes. If the tires start to show abnormal ware or become problematic then I'll write the big check for a tire/rim changeout.
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Old 11-19-2015, 05:17 PM   #27
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And maybe a big check for damage to the Airstream.
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Old 11-19-2015, 05:20 PM   #28
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Quote:
Originally Posted by Bill M. View Post
And maybe a big check for damage to the Airstream.
I'm sure you're referring to my insurance company!
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