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Old 10-12-2011, 11:33 AM   #15
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1981 31' Excella II
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After reading something FINALCUTJOE posted.

Trailer Tires Explained - TDR Roundtable

I am feeling better about purchasing my XL tires. The D rated Goodyear Marathons are 31lb each. My tires are 37lbs. Yeah they are a few mm wider which gives you free load capacity but some of that is heavier construction overall. The above article said trailer tires push the specs to the limit because they don't need a safety factor since they are not rated for passenger use. The risk is loosing a trailer and not the tow vehicle. I would rather have the conservatively rated XL truck tire than something that is cheaped out to the max to increase profit.

Perry
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Old 10-15-2011, 09:54 AM   #16
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I made the switch yesterday from 15" Marathon's to 16" Michelin LT's on my '05 31D Classic. My Marathon's, made in the USA, had many sidewall bubbles after only one year and 12,000 miles of service. In an incident two years ago I had a Marathon tread separate and bash in an aluminum panel at considerable expense. I could have purchased 60 new tires for the cost of the aluminum repair! I now have 4 Alcoa 15" rims, hub caps and lug nuts for sale if anyone needs wheels in excellent condition.


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Old 10-15-2011, 10:26 AM   #17
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put me in the Michelin LT camp. 40,000 miles, no problems. my trailer weighs 5800 on the axles so I got a lot of spare capacity. double axle. yeah, they squirm a bit backing. no problem. they do not leak down every month either.
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Old 10-23-2011, 07:56 PM   #18
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The first 900 miles was uneventful. On the way back we were running between 65 and 70 MPH and the tires were barely warm. I think the new tires are going to be ok.

Perry
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Old 11-16-2011, 03:10 PM   #19
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I'm looking at the Michelin's.

Michelin LTX M/S2 P235/75R15XL.

I find it interesting that the same tire model is sometimes a P and other times a LT.

LTX M/S2 | Michelin Tires

Is there any difference in construction with the P's and the LT's?
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Old 11-16-2011, 08:34 PM   #20
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I also have found that confusing, but after reading as much as I could find I am about to get the Michelin LTX MS2 XL 235/75/15. I plan on putting these on my 2008 25 foot Safari. I just put it on the scales yesterday with it mostly empty weighing in at 5480 lbs. Even loaded the way we travel it wouldn't get over 6000 lbs. I feel this is well within the limits or these tires. Hope this helps.

Mike
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Old 11-17-2011, 02:12 AM   #21
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I also have found that confusing, but after reading as much as I could find I am about to get the Michelin LTX MS2 XL 235/75/15. I plan on putting these on my 2008 25 foot Safari. I just put it on the scales yesterday with it mostly empty weighing in at 5480 lbs. Even loaded the way we travel it wouldn't get over 6000 lbs. I feel this is well within the limits or these tires. Hope this helps.

Mike
I think I am going to go with these as well with some metal tire stems. I haven't had a chance to weigh my trailer yet but the listed GVWR is 6200lbs with a dry weight of 4600lbs.

1985lbs@50psi x 4 = 7940lbs

Seems like plenty of breathing room.
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Old 11-17-2011, 06:26 AM   #22
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According to Andy from CanAm in Ontario you want the LT version. They have installed these on over 200 Airstreams over the past decade. You can do a search for his posts. The real issue is reliability. Having ST tires with high load ratings means nothing when they fail. They don't fail because the load rating was exceeded, they fail because they are crap. I'll take the LT Michelins with the C rating before any D or E rated ST tire on my 28' Safari.
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Old 11-17-2011, 07:40 AM   #23
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Originally Posted by Xenomorph View Post
I'm looking at the Michelin's.

Michelin LTX M/S2 P235/75R15XL.

I find it interesting that the same tire model is sometimes a P and other times a LT.

LTX M/S2 | Michelin Tires

Is there any difference in construction with the P's and the LT's?
?? Any one know the answer to this question?
Mine are Michelin LTX P 235/R75 15 XL. The XL means extra load and they have the same load rating as a LT C rated tire.
P's or LT's they perform great on my 25 Safari. At 50 lbs inflation, the ride is much smoother than on any of my ST tires. On my last road trip I went 70 mph all the way, safely and uneventfully.
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Old 11-17-2011, 07:51 AM   #24
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It would be an interesting test to put a trailer tire on one axel and an XL rated passenger car/truck tire on the other axel and measure temperatures after driving 60 miles in dessert heat. I bet you would find the XL tire ran cooler. You could test again and swap axels to null out any differences between front and rear axel loading.

Perry
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Old 11-17-2011, 09:24 AM   #25
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Here is some information from Tire Rack about the LT and P ratings. Tire Tech Information - Load Reduction of Euro- and P-Metric Tires on Light Trucks Essentially, when you use a P tire on a SUV or truck, you need to deduct 10% of the load rating. I don't know how that translates to trailer use as neither tire is rated for that.
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Old 11-17-2011, 10:14 AM   #26
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Where is the P stamped on the tire?

Perry
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Old 11-17-2011, 10:58 AM   #27
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Originally Posted by perryg114 View Post
Where is the P stamped on the tire?

Perry
When you look up the Michelin LTX MS2 in the size 235/75R15 it is designated as a P. I don't see anywhere online where there is an LT version.

LTX M/S2 | Michelin Tires.

When looking at the different sizes on this model the P version all have a higher speed ratings of T(118MPH), while the LT versions have R(106MPH).

In person I am not sure if they are marked P or LT as I have not seen one.
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Old 11-17-2011, 11:40 AM   #28
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I think a lot of it is blue smoke and mirrors. I think the 1985LB number is derated from 2185lb which is what the 108T lable on the tire designates. Which according to tire rack was done because the CG of SUV's was higher than a car which puts more dynamic load on the tire in a turn. So think g-load in a turn times the lever arm of the higher CG and it puts more load on the tire than the same weight car would. So if you multiply a P tire rated for 2185 which is a 108T rated P metric tire. If you put it on an SUV you multiply .91 x 2185 + 1988 which rounds down to 1985lb so there is your answer. Now does an Airstream have a high CG compared to an SUV, no probably not and you are not going to be taking turns at 90mph like poeple do all the time in cars.

Now look at speed ratings. This to me means the tire is rated for 100+ MPH with an SUV driving like a bat out of hell. Let's go for the Airstream land speed record. I don't think I will make it since Ford limited my Excursion to 100MPH before the speed limiter kicks in.

Perry
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