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Old 02-08-2018, 10:02 AM   #21
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Quote:
Originally Posted by minddr View Post
I am looking to replace the ST tires with LT tires. I have ST 225/75R15 on now. I am hoping not to have to go to 16 inch wheels.

Can I put Michelin LTX 235/75R15 XL tires on?

Any other suggestions?
The Michelin DEFENDER LTX M/S - SIZE: 235/75R15 is Michelin's Highway All-Season light truck tire. Load Range: XL [Max Load 1030kg (2271 LB) and Max Press 340kPa (50 PSI)]; Speed Rating: T [190 km/h (118 mph)]

I have the above tires on my trailer - installed at time of purchase by Can-Am RV. The GVWR is 7,300 lbs. I calculated the 85% capacity of the four tires at 7,725 lbs and this still provides an additional safety margin 425 lbs.
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Old 02-08-2018, 10:10 AM   #22
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My input... I feel that the 16" stay a bit cooler than the 15" IMO.

I bought the Michelin LTX M/S2 225/75/R16 on PepBoys Ebay site for $176/ea delivered! Then the Sendel split spoke 16x6 wheels for $109/ea delivered. $25/ea at local shop mount/balance and will be into it $1240 I mount. Then sell the originals and I should be about $600-$700 for the upgrade.
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Old 02-08-2018, 10:56 AM   #23
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In the fall of 2012, we put the 15" Michelin LTX (P) 235/75R15 XL tires on the stock wheels of our new 2013 25FB International Serenity after towing it from Los Angles to Phoenix. Per Andy Thompson, we inflated to 44 psi. No tire issues.

The 25FB was traded in on our 2014 31' Classic that came in January 2014 with the same 15" GYM ST225/75R15D tires that were on the 25FB. I purchased the 16" SenDel T03-66655T wheels that Airstream sold along with the 16" Michelin LT225/75R16/E LTX M/S2 tires as standard equipment on the Eddie Bauer models and were for sale at the entrance to the customer service center. We run 72/73 psi on these tires with no issues.

We installed 15" SenDel T03-56545T wheels with the same model 15" Michelin LTX (P) 235/75R15 XL tires we used on the 25Fb on our new 2015 23D International Serenity while it was at the dealership in New Jersey and used 44 psi. It came with 14" wheels and 14" GYM tires. No tire issues with the Michelins.
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Old 02-08-2018, 10:59 AM   #24
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Hi, A newbie been lurking for about 6 months...first post!

Excellent information and discussion. Basic question:
The Michelin LTX 235/75R15 XL as listed on the Michelin specs as well as posted by others reflects a max load of 2271lbs @ 50psi per tire.

Please correct me if I'm wrong but 2271*4 = 9084lbs
The 2018 30ft AS has a GVWR of 8800lbs. Thus a margin of error of 284lbs.

While the 8800lbs is the GVWR doesn't this seem like a rather small margin of error?

Yes, I figure the tire manufacture likely tests the tire and picks a load rating lower to account for bouncing down the highway and all but still seems a bit close for comfort, thoughts?
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Old 02-08-2018, 11:18 AM   #25
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Be aware that the 8,800 pounds is not all carried by the tires. With atypical real world tongue weight of about 1,000 pounds, the axles are carrying perhaps 7,800 pounds. Most trailers do not go down the load at max weight either.

Our fully modified 31' Classic has a 10,000 pound GVW real world load numbers are

Classic Scale numbers May 2014

……1200……——1200

2034……2042—4076

1921…….2062—3983

Total weight——9259

Michelin LT225/75R16/E LTX M/S2
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Old 02-08-2018, 11:21 AM   #26
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Ah, tongue weight, thank you!
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Old 02-08-2018, 11:38 AM   #27
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The GYE have a max load of 2830 lbs. That gives a total of 11,320 lbs. with 4 tires. GYE have a load range E - speed rating 87.
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Old 02-08-2018, 12:03 PM   #28
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Quote:
Originally Posted by markuscis View Post
Hi, A newbie been lurking for about 6 months...first post!

Excellent information and discussion. Basic question:
The Michelin LTX 235/75R15 XL as listed on the Michelin specs as well as posted by others reflects a max load of 2271lbs @ 50psi per tire.

Please correct me if I'm wrong but 2271*4 = 9084lbs
The 2018 30ft AS has a GVWR of 8800lbs. Thus a margin of error of 284lbs.

While the 8800lbs is the GVWR doesn't this seem like a rather small margin of error?

Yes, I figure the tire manufacture likely tests the tire and picks a load rating lower to account for bouncing down the highway and all but still seems a bit close for comfort, thoughts?
That is not a LT tire...that is a P rated tire...not good...need more leeway.
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Old 02-08-2018, 12:11 PM   #29
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Originally Posted by tjdonahoe View Post
That is not a LT tire...that is a P rated tire...not good...need more leeway.
According to The Tire Rack, the Michelin DEFENDER LTX M/S - SIZE: 235/75R15 is a light truck tire. "The Defender LTX M/S is Michelin's Highway All-Season light truck tire ..." The tire size does not have the 'P' designation.
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Old 02-08-2018, 12:28 PM   #30
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One thing to note with the Michelin P.....XL tire on the heavier trailers is that they need to be de-rated by 10% in regards to load rating for use on a trailer. That is a D.O.T. requirement. So the load printed on the tire needs to be at least 10% higher than the axle rating divided by 2.

I like them. I run them. But I have plenty of load overhead on my older 25' trailer. My axles are rated at 3000 lbs each.
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Old 02-08-2018, 12:29 PM   #31
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Just ordered an International Signature 30. Having the factory add the wheel/tire from Classic/Tommy B.
16” and Michellin LT’s.
I’ll adjust air pressure according to load.

Limitations to ST’s include 65mph max. Just doesn’t work on today’s interstate highways.
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Old 02-08-2018, 12:58 PM   #32
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2016 27’ FC FB here. All tech specs taken into consideration, I took the advice from Vinnie of Vinnie’s Northbay Airstream Repair and never looked back.

Swapped out factory 15’s for Sendel T02’s 16x6 6-5.5 wheels and Michelin LT 225/75/R16 Defenders, load range E and aired to 65 psi COLD (hasn’t been towed and tires in the shade).

Been almost a year since the swap. We travel at least 300 miles a month. Amazing difference on how well the trailer pulls and tracks. Here in California we can’t go faster than 55 mph. However, it’s comforting to know we can travel a bit faster (shh.. did I say that?) and not be worried about blowouts or the trailer pulling “wishy-washy”. Same packing style and noticed the amount of items inside getting tossed around didn’t increase with stouter tires. In fact there’s actually less items in disarray now after towing. This wheel and tire combination works for us.

Michelins on the left, Marathons on the right. Click image for larger version

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Old 02-08-2018, 03:10 PM   #33
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Quote:
Originally Posted by hobiedog View Post
Had all 3 of my Goodyears go out on my old Bambi in 5 years. When I got my International 25 3 years ago, I had the dealer put on the 15" Michelins and with 30K miles on them, all is OK. The softer ride is also great for the AS.
Which Michelins? Are they passenger tires? Load rating?

Thanks
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Old 02-08-2018, 03:24 PM   #34
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I think the Michelin Defender 15 inch might be pushing the load limit with a loaded 30 ft Int Serenity. I should probably switch to 16 inch or consider another suggested tire like the Nokian's
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Old 02-08-2018, 04:07 PM   #35
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Quote:
Originally Posted by Adventure.AS View Post
According to The Tire Rack, the Michelin DEFENDER LTX M/S - SIZE: 235/75R15 is a light truck tire. "The Defender LTX M/S is Michelin's Highway All-Season light truck tire ..." The tire size does not have the 'P' designation.
Sorry, but they are not. LT tires specifically have a LT prefix in the tire model designation. At that webpage, it is assumed P if it has no designation.

The 235/75r15 Michelin tire is kind of in between, as it's not a normal P, nor an LT, but an XL (extra load) P tire construction.
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Old 02-08-2018, 04:27 PM   #36
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Quote:
Originally Posted by Adventure.AS View Post
According to The Tire Rack, the Michelin DEFENDER LTX M/S - SIZE: 235/75R15 is a light truck tire. "The Defender LTX M/S is Michelin's Highway All-Season light truck tire ..." The tire size does not have the 'P' designation.
Nope....p rated...a LT tire uses 80 lbs of air.. P is 44.. do your research...
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Old 02-08-2018, 04:42 PM   #37
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Nope....p rated...a LT tire uses 80 lbs of air.. P is 44.. do your research...
Did you check the link in my post? Clearly described as light truck tires. Not a 'P' tire. Your definition of max PSI of 80 PSI defining an LT tire would also make an GYM ST equivalent to a light truck tire. Do your research.
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Old 02-08-2018, 04:59 PM   #38
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Look at the size tab and you will see some tires with the LT, but most without.
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Old 02-08-2018, 05:18 PM   #39
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Fellow Airstreamers, I’m not taking sides. I’d like everyone to be on the same page so we can all be better at making informed decisions. I just chatted with Michelin. I used the tire info from your posts as best as possible to ask Michelin about what category the tires are. This is what transpired. Click image for larger version

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Old 02-08-2018, 05:20 PM   #40
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Quote:
Originally Posted by minddr View Post
I am looking to replace the ST tires with LT tires. I have ST 225/75R15 on now. I am hoping not to have to go to 16 inch wheels.

Can I put Michelin LTX 235/75R15 XL tires on?

Any other suggestions?
Maybe you can use those tires. It depends on their load carrying capacity after they have been de-rated and the actual weight imposed on each tire is measured. (in other words, weigh then calculate) Or assume there will be the maximum allowed load on each trailer axle (what I would do)

This is a website where anyone can read the entire regulation text:
https://www.ecfr.gov/cgi-bin/text-id..._1110&rgn=div8

This is the regulation title:
§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.

This is the most important part, IMO, copied and pasted:
(2) Trailers may be equipped with ST tires, FI tires, or tires with a rim diameter code of 12 or below that meet the requirements of §571.109 or §571.119.
S4.2 Tire load limits.
S4.2.1.1 The vehicle maximum load on the tire shall not be greater than the applicable maximum load rating as marked on the sidewall of the tire.
S4.2.1.2 The vehicle normal load on the tire shall not be greater than 94 percent of the load rating at the vehicle manufacturer's recommended cold inflation pressure for that tire.
S4.2.2 Tire load limits for multipurpose passenger vehicles, trucks, buses, and trailers. S4.2.2 Tire load limits for multipurpose passenger vehicles, trucks, buses, and trailers.
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.
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