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Old 06-08-2016, 07:17 PM   #15
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Just for the sake of clarity, per a call I just made to Michelin, the Michelin Defender LTX M/S 235/75R15 235/75R15/XL 109T is not a P-metric tire. That is, there is no "P" in the size. It is what they referred to as a "euro-metric" tire.

According to Tire Rack, however, it doesn't really matter. You still have to de-rate to put these tires on a trailer. The figure they use is 9% vs. the 10% we usually see quoted here. Either way, these tires have plenty of capacity for our trailer's GVWR even though, based on CAT scale visits in the past, we don't expect us to hit that anytime soon.

I'm sure this has been cited before, but just for completeness: https://www.tirerack.com/tires/tiret...jsp?techid=219
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Old 06-08-2016, 07:45 PM   #16
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Actually a tri-axle has a much lower weight per tire than most other models. Take the 11,500 GVW of the Classic 34 and divide by 6 and the math shows 1,916 pounds per tire versus the 2,500 pounds per tire number of the 31 Classic. Since the tongue weight will decrease the tire load, the 15" Michelins are suitable even at their derated capacity.
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Old 06-08-2016, 07:49 PM   #17
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Indeed but ever watch a triaxle back into a spot?
I literally ripped off a Michelin.... not popped a bead but tore the sidewall of a 16" ms2.
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Old 06-08-2016, 07:51 PM   #18
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Quote:
Originally Posted by Rocinante View Post
Just for the sake of clarity, per a call I just made to Michelin, the Michelin Defender LTX M/S 235/75R15 235/75R15/XL 109T is not a P-metric tire. That is, there is no "P" in the size. It is what they referred to as a "euro-metric" tire.

According to Tire Rack, however, it doesn't really matter. You still have to de-rate to put these tires on a trailer. The figure they use is 9% vs. the 10% we usually see quoted here.

I posted something recently about the regulation on derating passenger tires for use on trailers by dividing sidewalk capacity by 1.1 which actually is effectively a 9% reduction, not 10%. I questioned whether the person writing the spec mistakenly applied the reverse function of markups to this derating procedure (if you need to make a 10% profit you would MULTIPLY your price by 1.1 and that would give you a full 10%). To reduce by a full 10% you would actually multiply the capacity by .9, but I have to assume the spec is what it is.
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Old 06-08-2016, 07:54 PM   #19
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Originally Posted by switz View Post
Actually a tri-axle has a much lower weight per tire than most other models. Take the 11,500 GVW of the Classic 34 and divide by 6 and the math shows 1,916 pounds per tire versus the 2,500 pounds per tire number of the 31 Classic. Since the tongue weight will decrease the tire load, the 15" Michelins are suitable even at their derated capacity.

I don't think it's a weight question but the severe forces on the sidewalls in hard turns (especially backing in to a spot) for those triaxles.
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Old 06-08-2016, 09:55 PM   #20
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I sure like my 225/75/16 e michelins, and I am not worried about the sidewall,on my 31 classic there is 8700 lbs on the 2 axles...
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Old 06-08-2016, 11:00 PM   #21
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Here is the regulation:

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.
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Old 06-08-2016, 11:40 PM   #22
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I just bit the bullet and installed Sendel 16" rims, Centramatics, TST TPMS, and Michelin 225/75R 16 E XPS Ribs on our '15 27FB Classic. I did two short runs up the Delta (20 mile and 100 mile) to "set" the new wheels and replacement McGard lugs at 110 ft/lbs, and test the TPMS - so far, so good. I honestly cannot say that I felt any difference between the new set of rims/tires and the old 15" stock rims and GYM tires, but I chalk that up to the fact that the Ram 3500 doesn't seem to notice that it has a trailer in tow in either configuration. I went the extra expense for the steel-walled XPS Ribs because of the expected stress on the sidewalls. I'm going to try running them @ 75 lbs each, which would give them plenty of margin on our load (hard to get a 70 degree pressure reading in Mississippi this time of year - it's already 80 degrees by 6am!).

The real proof of the pudding comes next week as we drive the 1500 miles to the Adirondacks of New York State. I'll report back on my experiences after the 3000+ mile round trip...
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Old 06-09-2016, 12:11 AM   #23
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Sounds good, best wishes for a great trip on your new 16" Ribs!

Meanwhile, here's a link to the document that Switz and SteveSueMac cited above, for those of you who like to read that stuff. Just do a search of that document for "S4.2.2.2"

https://www.gpo.gov/fdsys/pkg/CFR-20...sec571-110.pdf

OR

https://www.gpo.gov/fdsys/granule/CF...ol6-sec571-110 (from here you can choose to download the PDF or the XML (text) version)
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Old 06-09-2016, 11:47 AM   #24
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Yes but as Michelin will tell you...
Mounting an LT tire on a travel trailer is a misapplication and voids the warranty of the tire.
michelin sent me a letter stating their official policy and position. Many say something to the effect that Airstream offers these as standard... its Airstream's decision not the component manufacturers......
I'm not trying to start a war, just sharing factual information right from the source. This smart person tried them.and literally ripped the sidewall at the bead while backing his tripleaxle on 2 different sets. Ive had failures of the sidewall as well. This cost me.tens of thousands of dollars on repairs... a well maintained st tire has cost me zero on failure repair. I.fulltime and cover 20-50 thousand miles a year.

With all due respect friend I refuse to believe that you ripped the sidewalls apart on a Michelin tire. You would have to nail the tires to the ground for that to happen. I couldn't do that running it flat for 5 miles. I never a had a Michelin tread separation or any kind of major tire failure. I sure had it with a GYM ST tire with 2 other tires ready to do the same.
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Old 06-09-2016, 12:15 PM   #25
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Ive had more failures with Michelin than any other brand. do you have experience with a triaxle Airstream?
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Old 06-09-2016, 12:20 PM   #26
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I feel like grabbing some popcorn - don't know why... 😀
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Old 06-09-2016, 06:06 PM   #27
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Make lots of popcorn....😀


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Old 06-10-2016, 07:19 AM   #28
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