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Old 08-10-2011, 07:20 AM   #15
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Originally Posted by SmokeyWren View Post
Since 90 PSI gives you over 2,800 pounds weight capacity per tire, I'd go with 90 PSI.
On review, I thought I'd explain why.

The load/inflation table for those tires indicates that 90 PSI will be more than enough to handle your max load on those tires, with your trailer loaded to the gills, and with a 32% fudge factor. More PSI than 90 will result in a harsher ride inside the trailer, shaking the cabinets and banging around stuff inside the trailer. Plus a minor consideration is that the center of the tread on the trailer tires will wear faster when the tire is over-inflated for the load on the tire.

However, it won't hurt the tires and probably won't hurt a well-constructed trailer (that has shock absorbers) to pump up the tires to 100 or 110 or even the 125 PSI on the sidewall of the tire - if you can find an air compressor that will pump up the tires that much without taking all day to do the job. (The air hose on the truck islands at big truckstops will probably do the trick). The only advantage to higher than 90 PSI tire inflation would be an even bigger fudge factor, and you already have 32 percent fudge factor with 90 PSI.

DO NOT inflate the trailer tires to less than 90 PSI shown on the load/inflation table. Normal RV trailer tires do just fine with 65 or 80 PSI, but those "real truck tires" with load range "H" require at least 90 PSI.
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Old 08-10-2011, 08:00 AM   #16
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Originally Posted by Belle_Rouge View Post
According to my husband (who worked for Tire Kingdom for years) all Michalin (sp?) tires are made in the US.
Perhaps Michelin changed their rules, but for my pickup a few years ago I bought 4 Michelin XPS tires that were made in England. Michelin is a global company, with tire plants in, for example, the Spanish site of Vitoria, the Italian site of Cuneo, the North American sites of Greenville and Lexington and the Asian sites of Laem Chabang (Thailand) and Shanghai (China). Yes, Michelin makes tires in China, too. And of course they have plants in France and England and lots of other markets. But maybe they don't normally import them to the U.S.
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Old 08-10-2011, 08:05 AM   #17
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The Michelin XTAs on our 5th wheel (215/75R-17.5 LRJ, 4805 lbs @ 120 PSIG) were made in Denmark, but that's expected since the XTA is primarily a trailer tire used in European markets.

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Old 08-10-2011, 11:34 AM   #18
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I'm confused...you are going to carry an average of 20% of the RV's weight on the pin. So why "forget that weight" and why "carry 125% of the weight" on the tires?
It gives the tires a 25% gain over just enough and then the pin weight takes a little more weight off the tires. This is overkill in most folks opinion but this is enough of a safety margin in my opinion to relegate tire problems to the past.
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Old 08-10-2011, 11:59 AM   #19
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It's against the law for any RV trailer manufacturer to put tires rated at 3420# on 7000# axles. Maybe your axles are 6750#, They like to do things like that. Check the tags on the axles to cinfirm their true capacity.

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Uhh, I bought a Jayco new that had 7000 lb axles with load range E tires rated for 3450 each Commercial TA tires.
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Old 08-10-2011, 05:58 PM   #20
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Uhh, I bought a Jayco new that had 7000 lb axles with load range E tires rated for 3450 each Commercial TA tires.
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The Jayco 351rlts we are considering has 6000lb axles & 3420 e rated tires. Perhaps yours also has 6000 vs 7000lb axles?
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Old 08-11-2011, 12:48 AM   #21
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Originally Posted by RustyJC View Post
The Michelin XTAs on our 5th wheel (215/75R-17.5 LRJ, 4805 lbs @ 120 PSIG) were made in Denmark, but that's expected since the XTA is primarily a trailer tire used in European markets.

Rusty
Because your Michelin tires were designed for the European market they are speed rated at 62 MPH. The Tire & Rim Association makes no provision to manipulate the load and air pressures on any tires with speed ratings below 65 MPH. You can find that information in the current Michelin Tire Data Book on page 89.

Since Michelin is currently experimenting with them on some RV trailer 8000# axles Iím wondering how they are going to address the TRA standard???

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Old 08-11-2011, 07:27 AM   #22
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As we have discussed many times before, 62 MPH equates to 100 km/h, the European speed limit for trucks. The Michelin XTAs are standard equipment on a number of high-end 5th wheels and have been retrofitted to replace the Goodyear G614s by others of us. I generally cruise at 62-65 MPH but will run faster for brief periods if conditions require it. Despite that, I have seen NO reports of failures of the XTAs in U.S. trailer service for speed-related or any other reasons, have you?

This is another "RV enthusiast's shared experience" (ref iRV2's Mission Statement), OK?

If you don't like the XTAs for a 17.5" application, then use the equivalent Goodyear G114s or tires from other manufacturers. Your money - your choice, just as the choice to use the XTAs is mine.

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Old 08-11-2011, 11:55 PM   #23
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As we have discussed many times before, 62 MPH equates to 100 km/h, the European speed limit for trucks. The Michelin XTAs are standard equipment on a number of high-end 5th wheels and have been retrofitted to replace the Goodyear G614s by others of us. I generally cruise at 62-65 MPH but will run faster for brief periods if conditions require it. Despite that, I have seen NO reports of failures of the XTAs in U.S. trailer service for speed-related or any other reasons, have you?

This is another "RV enthusiast's shared experience" (ref iRV2's Mission Statement), OK?

If you don't like the XTAs for a 17.5" application, then use the equivalent Goodyear G114s or tires from other manufacturers. Your money - your choice, just as the choice to use the XTAs is mine.

Rusty
Yep! That's kinda what I said without putting in all the extra "stuff". And I'm still wondering how Michelin is bypassing the TRA standards.

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Old 08-12-2011, 12:01 AM   #24
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Originally Posted by Belle_Rouge View Post
According to my husband (who worked for Tire Kingdom for years) all Michalin (sp?) tires are made in the US.

Good luck!!
Nope!! My Michelins I took off our DSDP were 275/70 22.5's and were made in Spain. I haven't looked at the new ones close enough to note where they are made.
Go to the Michelin site and see how many different plants there are around the world.
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