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Old 08-01-2013, 11:34 AM   #113
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1985 x 4 = 7940

7940 - 794 = 7146
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Old 08-01-2013, 12:23 PM   #114
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Ok. I am either a sheep or a smart consumer (you be the judge but don't tell me your opinion :-) )

At this site you linked, the tire is rated at 2183. Dividing by 1.1 derates the tire to 1984. On 4 tires that's 7938 capacity. Divided again by 1.15 for 15% headroom (on the already 10% derated tires) leaves 6902 capacity.

Last trip to scales, trailer weight (both axles on one scale) was 5880 (call it 6000 to be safe). Tongue at 1140. This includes:

Full WD applied
ProPride hitch
1/2 fresh water full
2 full 30 propane tanks
Camp loaded (gear, clothes, dishes, liquids, etc)
Empty gray and black tanks.

Am I correct in assuming that putting these tires on would still give me 900+ lbs capacity in the trailer? If so, I'm starting to think I should get a set of 4 and pop them on the trailer before a long trip this month. You all have me freaked out about the GYMs despite their 10.000+ lb capacity.....I really don't like the idea of going up to 16s but if these 15s can do the job well...I'm really tempted.

Thoughts/comments/suggestions highly welcomed!!! :-)

Edit: trailer is 27FB Flying Cloud 7600 max weight
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Old 08-01-2013, 12:32 PM   #115
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Originally Posted by SteveSueMac View Post
~~

Am I correct in assuming that putting these tires on would still give me 900+ lbs capacity in the trailer? If so, I'm starting to think I should get a set of 4 and pop them on the trailer before a long trip this month. You all have me freaked out about the GYMs despite their 10.000+ lb capacity.....I really don't like the idea of going up to 16s but if these 15s can do the job well...I'm really tempted.
~~
I think you're understating, even. "900+ pounds of reserve capacity AFTER a conservatism factor of 15%" would still be fair to say.

I only have about 3200 miles on the Michelins, in a year of travel in hot weather and cool, but every time I have measured (which is generally every stop) they have been closer to the ambient temperature than the Carlisle STs they replaced, and they maintain air pressure MUCH better over time.

I'll be putting a set of the Michelins on the 28' rear-bed Argosy when that's ready for the road.
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Old 08-01-2013, 02:50 PM   #116
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DMT,

Your math is the same as mine. I have not seen any manufacturers spec of a higher rating for the Michelin LTX ms2 XL than 1985 lbs. Where did the above poster come up with the 2183 figure? If that is listed somewhere credible I would feel better using them on our trailer.
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Old 08-01-2013, 02:55 PM   #117
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DMT,

Your math is the same as mine. I have not seen any manufacturers spec of a higher rating for the Michelin LTX ms2 XL than 1985 lbs. Where did the above poster come up with the 2183 figure? If that is listed somewhere credible I would feel better using them on our trailer.
It's the number that's stamped on the sidewall...
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Old 08-01-2013, 03:06 PM   #118
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I will have to look at that on my wife's truck when I get home. I will also look at the tire store. If that is truly the case I will definately go that route and be done. That still allows for 200+ lbs over GVWR for the trailer. Has anyone done the math on how much the tires are actually carrying? If the toungue weight is 1000 lbs and we can just be "Simpleton's" saying that is carried by the tow vehicle, then the using the GVWR of 7600 lbs as the trailer weight, would that mean the trailer wheels are carrying 6600 lbs? 7600-1000=6600.
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Old 08-01-2013, 03:11 PM   #119
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The 27FB Flying Cloud and Internationals both have a GVW of 7,600 pounds. Their tongue weights are 791 pounds and 770 pounds respectfully. Rounding the tongue weights up slightly to 800 pounds, which will really be lower than reality, your rear axles, with the trailer freestanding fully loaded to maximum GVW, would be supporting 6,800 pounds. Allowing for a 1/3 transfer of tongue weight would bring the trailer axles load to 7,080 pounds.

Four derated Michelin LTX (P) 235/75R15 XL tires could carry 7,940. which is more than a 10% safety margin. The reality will probably be tongue weights approaching 1,000 pounds or heavier and that just increases the safety margin.
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Old 08-01-2013, 03:21 PM   #120
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I will be getting these this weekend if time allows. 4 new Michelin LTX MS2s. Thanks for confirming my feeble math skills.
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Old 08-01-2013, 03:36 PM   #121
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This has been a very confusing and troubling experience riddled with multiple data points.

I am speaking of the MIchelin LTX MS2 in 235/75 R 15 XL

You have the load rating on the Michelin website of 1985 lbs for the tires.
You look at the "Load Index" which is labeled as a 108T and it tells you a weight of 2205 lbs per tire.
The tires themselves are labeled at 2183 at their max pressure.
Thank goodness my needs fall righ tin the middle. Just a little bit more info for others to use in making their selection.
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Old 08-01-2013, 03:58 PM   #122
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My understanding is that the Michelin LTX MS2 tire is rated at 2183 per the sidewall. The 1985 figure is already derated 10% (i.e., divide 2183 by 1.1 = 1985)
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Old 08-01-2013, 05:05 PM   #123
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My recently purchased Michelin LTX MS2 P235 75 15 XL tires have 2183 lbs stamped on the sidewall.
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Old 08-02-2013, 06:19 AM   #124
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Just a word of caution:

There can be side to side and front to rear variations in tire loading on a trailer. I have used 15% to account for this variation.
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Old 08-02-2013, 08:48 AM   #125
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Hi Folks

I think you might be over thinking this a little.

Tire ratings are a function of application ply rating and size, so the worst quality tire and the best have the same load rating. On a Quality tire they test well beyond the load ratings.

Other than 30' Slide-outs and some 86-93 32' models I have never weighed a loaded for travel Tandem axle Airstream that was over 8000 pounds on the axles. We have at least 200 customers with 30 & 31' Classic trailers with 235 Michelins with several years of excellent results, we just don't get failures. Some of our original test units went 10 years without a failure.

Rich Luhr who has a 30' heavily loaded trailer and does substantial miles was averaging 3 ST failures a year. I beleive he still has the original 4 Michelins he installed 4 or 5 yers ago.

I am sure there are other 235 tires that will work but our track record is with Michelin.

The 16" Load Range E tires from the Eddie Bauer are also very reliable but they are quite harsh riding for the Airstream, we have switched several Eddie Bawers to smoother riding 16" tires.

I hope this helps.

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Old 08-02-2013, 09:12 AM   #126
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Andrew,

Thanks for your comments. This is all quite unnerving. You get to where you are almost manic on what is the correct answer. If the tires (Michelin 235/75 r 15 XL 108T) are truly sufficient according to their stamped on carcass rating I will go this route instead of spending $1400 + on new wheels and tires.
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