Tires - Fiberglass RV


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Old 04-30-2013, 05:13 PM   #1
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I posted this at the Escape forum, but it may be of interest here:

Well, the trailer now has a set of Maxxis D rated ST205/75/15 tires. Both the RV dealer that did the work as well as the tire store that did the mounting insisted that trailer tires must be inflated to their maximum sidewall pressure. Since I suspected that they would feel that way, I printed out a copy of both Maxxis's & Goodyear's RV & Trailer Tire Inflation Pressure/Weight Tables, but they wouldn't let me out of the shop without 65psi in the tires.

I know that there are believers in both theories, and I suspect the "inflate to sidewall pressure" comes from larger trailers that are at the tire weight limits, but I don't understand why there are inflation tables from both manufacturers if the shops won't use them. Maybe because they have no idea of what the trailer actually weighs?

In any case, the bearing have been checked, repacked & brakes cleaned & adjusted. All the various spring projects in the trailer are done so I'm ready to go!
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Old 04-30-2013, 05:46 PM   #2
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Here we go again.

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Old 04-30-2013, 05:49 PM   #3
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Here we go again.

jack
Yea, I probably should have kept my mouth shut (well, my fingers off the keyboard)...
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Old 04-30-2013, 05:49 PM   #4
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Quote:
Originally Posted by Jon Vermilye View Post
I posted this at the Escape forum, but it may be of interest here:

Well, the trailer now has a set of Maxxis D rated ST205/75/15 tires. Both the RV dealer that did the work as well as the tire store that did the mounting insisted that trailer tires must be inflated to their maximum sidewall pressure. Since I suspected that they would feel that way, I printed out a copy of both Maxxis's & Goodyear's RV & Trailer Tire Inflation Pressure/Weight Tables, but they wouldn't let me out of the shop without 65psi in the tires.

I know that there are believers in both theories, and I suspect the "inflate to sidewall pressure" comes from larger trailers that are at the tire weight limits, but I don't understand why there are inflation tables from both manufacturers if the shops won't use them. Maybe because they have no idea of what the trailer actually weighs?

In any case, the bearing have been checked, repacked & brakes cleaned & adjusted. All the various spring projects in the trailer are done so I'm ready to go!
This has been hashed about cussed and discussed here many times. The last time I pointed out the wording on those charts. Those ARE NOT recommended inflation charts. They are charts that show the minimum inflation by weight, not the recommended inflation points, big difference. I have seen on Goodyear and Carlise web sites where they indicate the recommended inflation is the pressure shown the on the sidewall.

Here comes the low tire pressure guys to give you their opinion.
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Old 04-30-2013, 06:02 PM   #5
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Glad to hear you are good to go for the year now, Jon.

I too subscribe to the belief in keeping tires at, or at least near, maximum allowable regardless of other interpretations of charts. I just see to many benefits, with little reason to go less. Reace at Escape has recommended max pressures to me too.
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Old 04-30-2013, 06:09 PM   #6
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That is interesting - he is the one that recommended 45psi for my 17B.
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Old 04-30-2013, 06:10 PM   #7
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Same here...40-45 psi. I compromise at 42!
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Old 04-30-2013, 06:55 PM   #8
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That is interesting - he is the one that recommended 45psi for my 17B.
My stock tires only have a max of 50psi. He had suggested at least 45 to me too.
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Old 04-30-2013, 06:59 PM   #9
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Well mine are inflated to max as was recommended by the tire store even after we discussed the actual weight of my trailer.
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Old 04-30-2013, 07:14 PM   #10
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This might be a good topic after 30,000 kms or so.

If it has too much air the middle of the tread will be worn and if not enough the outside edges will be worn.

ready ...set ....get camping

I'll be waiting for the results .....lol
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Old 04-30-2013, 09:05 PM   #11
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I will bet that here on the good 'ol internet, you can find folks who will present convincing sounding arguments that will say anything from about 25 psi to 80 psi is the magic number.
I say, run whatcha want.....cuz you ain't gonna convince anybody they are wrong on this subject.....
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Old 04-30-2013, 10:33 PM   #12
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Thanks Jon and Byron,
From the Carlisle site:
http://www.carlisletransportationpro..._Practices.pdf
I learnt a few things:
– 3 to 5 years is the average life expectancy of a trailer tire,
regardless of mileage.
– Maintain air pressure at the maximum PSI recommended on the
tire sidewall.
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Old 04-30-2013, 11:02 PM   #13
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My feeling is that the sidewalls carry the load so I go max pressure.

My trailer tires are nine years old and I'm thinking this may be the year to change them.
Next year I'll be spending a lot of time on the road.
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Old 05-01-2013, 07:47 AM   #14
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I see Carlisle doesn't muddy the waters with charts of inflation pressures linked to trailer wgt. What a relief. Go chalk Carlisle on the sidewalls of my Goodyrs and be happy at least until the received wisdom changeth. Interesting comments on inflation recs issuing from the Escape builder. I suppose he inflates his tires one at a time just like the rest of us.

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