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Old 12-31-2015, 03:09 PM   #71
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Originally Posted by Rocinante View Post
The max gross weight for our 27FB trailer is 7600 and 4 of these tires would handle a total load of 8176. That's a 7.5% safety factor for a maximally loaded trailer, assuming all tires are carrying the same weight. (BTW, we know it will *never* be true that all tires are carrying the same weight, and that our trailer fully rigged for camping comes in around 6,500.) So, we feel pretty comfortable, based on the numbers, with the idea that these new tires could work well for our trailer on our existing 15" wheels.
Remember, of the max 7,600 lb allowable, somewhere between 700 and 1,000 lbs of this will be carried by the tow vehicle via the hitch. On a CAT scale loaded for camping with a full fresh water tank, my 27FB came in at 6,000 lbs total on the axles. Using a Sherline scale the hitch weighed in at 900 lbs for a combined total of just under 7,000 lbs. Since the tires will probably always be carrying less than 6,500 lbs maximum, these tires should work out just fine.
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Old 12-31-2015, 06:41 PM   #72
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Roc & kscherzi

We're in the same boat
following along,
Our 27FB IS 6880 # total. 1000# of which is on the on the tongue. I'm torn on this issue. For sure, come spring, I need TPMS and at least brass stems. These tires do look promising.
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Old 12-31-2015, 07:00 PM   #73
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BTW
Similar discussion here
http://www.airforums.com/forums/f516/2015-flying-cloud-25fb-125637.html
Pg 127ish
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Old 12-31-2015, 07:32 PM   #74
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I've spent the last two afternoons online researching this issue. I have no faith in GMT, but changing out new 2016 cast aluminum rims did not sit right, I felt their had to be a better alternative & found one. This contender tire won't surface until March but it offers a solution for me & I'm going to roll the dice & place an order.
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Old 12-31-2015, 08:45 PM   #75
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I'm posting so I can follow this discussion.
It looks like the Michelin Defender 235 75 x 15 will work on both my 25' and 34'.
I'll need new tires before the summer travel season on my 25'.
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Old 12-31-2015, 09:08 PM   #76
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I'll be getting new tires too. My Marathons are over 3 years old at least with near 10,000 miles. Don't know manufacturing date. Three years seems to be when blowouts start.

By the numbers my 27FB should carry no more than about 1,800 lbs per tire worst case. Loaded for camping full fresh water the CAT scale said 6,000 lbs or 1,500 average per tire last time I weighed it. De-rated at just over 2,000 lbs for towing the 15 inch Defender ought to work just fine.

Here's a link to a blog on 15 inch Michelins that's informative. http://maze.airstreamlife.com/2015/0...ut-everything/
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Old 01-01-2016, 01:17 AM   #77
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LT means light truck duty, I believe
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Old 01-01-2016, 11:08 AM   #78
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Seems like I read somewhere that if the tire had LT at the end of the designation it could be used as a trailer tire. As opposed to LT being in the front. Anyone of the experts care to comment? Just curious.
LT means Light Truck, LTX designates Light Truck Extra load.
I have these Michelins on my 30' International 15" LTX - 108T high speed. They are awesome tires. At 50 PSI they are rated for 2,150 lb.
I can cruise at 70 MPH and not have any anxiety about trailer tires separating.
Hardly ever have to add air like with the crapola Goodyear Marathons AS installs on these expensive trailers.
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Old 01-01-2016, 02:57 PM   #79
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I am sure the Defenders will be a great addition to the potential AS tire population. I have been running the Michelin LTX P235 75 15 XL's on my 2002 Safari 25 for 15,000 miles. I run 44 psi per Andrew T's recommendation. They are a great tire. I have run Maxxis and Goodyear in the past. Only Michelin from now on.
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Old 01-01-2016, 04:42 PM   #80
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Ltx, light truck extra load?? Huh?
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Old 01-01-2016, 07:39 PM   #81
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not sure about that. ..
SUV - crossover?
Is there an answer?
They call it Light Truck - SUV / Crossover
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Old 01-01-2016, 07:48 PM   #82
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Ltx i believe is just a prefix that Michelin uses, it means nothing. The P means passenger car.
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Old 01-01-2016, 08:18 PM   #83
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The new Michelin Defender LTX M/S 235/70/15 109T XL is a "Euro-metric" sized tire, not the "P" designation tire it replaced. None of the new Michelin Defender LTX M/S tires are "P" tires. Kind of strange to me, but I guess this is a new trend in tires. GoodYear Wrangler All Terrain Adventure tires are designated the same way.

From Tire Rack-
"If there isn't a letter preceding the three-digit numeric portion of a tire size, it signifies the tire is a "Metric" size (also called "Euro-metric" because these sizes originated in Europe). While Metric tire sizes are primarily used on European cars, they are also used on vans and sport utility vehicles. Euro-metric sizes are dimensionally equivalent to P-metric sizes, but typically differ subtly in load carrying capabilities."

I'm not sure what difference it makes, but the absence of the "P" on the sidewall may make a few Airstreamers a bit more comfortable using this tire.
Very interesting. If a tire is specified under US standards it would have a P or LT prefix and if Extra Load P type would have the words Extra Load and letters XL molded on sidewall as part of the size designation.
XL is a US designation not European.

In Europe they have passenger tires and "commercial" tires. The Commercial being similar to our light truck tires. There is no XL designation recognized by ETRTO (European version of the US Tire & Rim Association.

According to DOT regulations a tire must meet either TRA or ETRTO to be legal for sale and use on US highways. A tire company may not pick and choose parts of the different regulations and be in compliance with DOT regulations.

If your tire has no P or LT in front of the "235/70R15" characters and has no XL after the "235/70R15" then it would be a European Commercial tire intended for use on trailers or trucks and would have no de-rating.

If it has "XL molded after the tire size then it would be not in compliance with Federal Regulations which require a tire MFG to specify which standards the tire is to be tested under.

It would clear this whole topic up if you could post pictures of the complete tire size, and the actual load and inflation information molded on the sidewall.

A Load Index of 109 is the single load on a TRA LT235/70R15 LR-D tire according to TRA
I do not see an XL version of a P235/70R15 in the 2010 TRA standards book I am looking at right now.
Checking my copy of ETRTO I find a passenger 235/70R15 in both "Standard" load 36 psi max and "Reinforced" rated for 42 psi. These had Load Index of 103 & 107.
There is of course no "XL" in European standards.
In the Commercial section of ETRTO standards I do find a 225/70R15C (not a typo no 235) with a Load Index of 109 at 375 Kpa (54 psi)

So I have no Idea what you were told when you bought the tires.
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Old 01-01-2016, 08:25 PM   #84
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LT means Light Truck, LTX designates Light Truck Extra load.
I have these Michelins on my 30' International 15" LTX - 108T high speed. They are awesome tires. At 50 PSI they are rated for 2,150 lb.
I can cruise at 70 MPH and not have any anxiety about trailer tires separating.
Hardly ever have to add air like with the crapola Goodyear Marathons AS installs on these expensive trailers.

Sorry but LTX is not a recognized tire size /type specification. It is a marketing name much like "Eagle" or "Champion" or "T/A" is.
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