Tires - Page 7 - Fiberglass RV


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Old 05-09-2013, 08:18 PM   #85
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Name: Brian
Trailer: Boler (B1700RGH) 1979
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Sooooooo, most of you don't trust the people who designed your trailers? Or do the rules you follow for your car and truck get thrown out when applied to the trailer?
[/soap box]
The people who designed my trailer are long gone. Their companies failed, or moved on to other lines of business.

My trailer's manufacturer did not say to inflate the tires to their maximum, although the 32 psi which they specified for the F78-14 tires (which they incorrectly showed as "F-78 x 14") may have been the maximum for those tires, and would be about the pressure required to handle the trailer's weight. I would not go below that recommendation with those tires, as I would not go below Toyota's recommendation for my Sienna's tires... no difference.

Although a great deal of good work and even innovation go into the design of our trailers, it is almost all related to the coach and not the chassis. The suspensions, brakes, wheels, tires, and couplers (everything that forms the running chassis other than the simple frame which connects them) are commodity parts which the trailer manufacturers use with little design effort. The trailer manufacturers need not be any more knowledgeable about tires than a kid working in a tire store with one day of training in looking up specs; they are in an entirely different league from that of even the least capable automotive manufacturer.
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Information is good. Lack of information is not so good, but misinformation is much worse. Check facts, and apply common sense liberally.
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Old 05-09-2013, 09:55 PM   #86
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I also usually upgrade if i can from manufacturer recommendations, whether in size/width even (god forbid) air pressure. also upgraded Scamp to 14 in radials
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Old 05-10-2013, 08:13 PM   #87
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If there is something to be known about tires of any kind, for any application, it is likely that Michelin knows it... and there is a good chance that they invented it. If I must blindly believe either Carlisle or Michelin based only on the source, I would certainly go with Michelin.
I thought you'd be interested to read that despite its business decision not to make trailer tires for smaller vehicles, Michelin does indeed subscribe to the notion that trailer tires are different in function and design.

You'll find their brief description of a trailer tire's form/function at this link. It's remarkably similar to Carlisle's, by the way...but since Michelin's said it now I s'pose we can all accept it as a fact.

Whew!

Francesca
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Old 05-10-2013, 09:59 PM   #88
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Trailer: 2013 Lil Snoozy #161 (SOLD)/2010 Tacoma
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I just received the June/2013 issue of Trailer Life magazine.
There is an article on trailer tires on page 50. I tried to find
the online issue to link but haven't found it yet.

Here is an article I did find on one of their links.
===============================
Q: I have a tire question that I’ve had about six different answers on from RV dealers. We have a fifth-wheel trailer with a dry weight of 7,794 pounds and its tires came filled with nitrogen gas. The tire size is ST225/75R15 with a 65-psi-cold tire pressure printed on the tire. I have two questions: Can I mix the gas with air? (There is no one in the area who carries the gas.) How much air/gas pressure should I keep in the tires? (I had work done on it at a large RV service center and it now has 52 psi in all tires; previously, it had 62 psi.)
David Miller, Anchorage, Alaska

A: It doesn’t matter whether there is nitrogen or air in the tires; use the same pressure regardless. You can mix them as well, although the straight air will dilute the claimed advantages of using nitrogen. You may be able to find nitrogen at a local welding or industrial gas supplier if your local tire shops don’t have it available. In order to determine what pressure to use in the tires, you need to weigh the fully loaded trailer (both axles) and divide the weight by the number of tires. Then look this weight up in a load-inflation table, which is available on tire dealers’ and manufacturers’ websites. Until you know how much weight is actually on the tires, to be safe, you should run the pressure that is listed on the sidewalls.
— Ken Freund

Another Tire Question
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Old 05-10-2013, 11:24 PM   #89
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You will do better using nitrogen it is more stable than air.

Heat is a killer for any tire and pressure changes except with nitrogen.
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Old 05-10-2013, 11:41 PM   #90
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Air is 78% nitrogen, anyway. Pressure most certain does change with nitrogen and heat. The difference is so small between nitrogen and air, it's not worth mentioning on a camper or normal car. I ran it racing, and even with tires so hot you could hardly touch them, the best it did over air was 7 psi less.



Might as well fill them with helium, you can tow a heavier trailer then.
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Old 05-11-2013, 12:02 AM   #91
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I run nitrogen in my new car.
I doubt I will run it when I have to buy new tires.
My garage charges $60 for nitrogen fill.
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Old 05-11-2013, 12:46 AM   #92
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Air is 78% nitrogen, anyway. Pressure most certain does change with nitrogen and heat. The difference is so small between nitrogen and air, it's not worth mentioning on a camper or normal car. I ran it racing, and even with tires so hot you could hardly touch them, the best it did over air was 7 psi less.



Might as well fill them with helium, you can tow a heavier trailer then.

I disagree with your view nitrogen is far more stable than air.
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Old 05-11-2013, 12:53 AM   #93
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I disagree with your view nitrogen is far more stable than air.
I'm going to invest in nitrogen futures.
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Old 05-11-2013, 03:26 AM   #94
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I disagree with your view nitrogen is far more stable than air.
I didn't say it wasn't more stable, did I? I said it did no good worth measuring on a plain car or trailer. I'll stand by that. If it makes a 7 psi difference in tires so hot you can't touch, it's not doing a thing on a trailer tire. Well, maybe if you towed at 150, or your camper did wicked burnouts.
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Old 05-11-2013, 01:48 PM   #95
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The main advantage of NitroFill for tyres is the removal of moisture and oxygen. The oxygen likes very much to react with eveything it touchs - hence oxidation (rust). The moisture will expand and contract much more with temperature, especially if it changes state (vapor, liquid, solid) and will help along oxygen's work.

But, if you have a decent air drier on your air compressor the difference between with or without nitrogen is small. Definitely not worth paying extra for, but I'll take if if it's free.

Jason
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Old 05-11-2013, 02:54 PM   #96
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The main advantage of NitroFill for tyres is the removal of moisture and oxygen. The oxygen likes very much to react with eveything it touchs - hence oxidation (rust). The moisture will expand and contract much more with temperature, especially if it changes state (vapor, liquid, solid) and will help along oxygen's work.

But, if you have a decent air drier on your air compressor the difference between with or without nitrogen is small. Definitely not worth paying extra for, but I'll take if if it's free.

Jason
Ditto
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Old 05-11-2013, 03:08 PM   #97
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338 wheeler................how'd you like to replace these?

https://sites.google.com/site/linkfo...ws/338-wheeler
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Old 05-11-2013, 04:01 PM   #98
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Trailer: 2004 13 ft Scamp Custom Deluxe
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You will do better using nitrogen it is more stable than air.

Heat is a killer for any tire and pressure changes except with nitrogen.
The whole myth about nitrogen advantage started in days of yore at the race track. Portable air compressors condense water which gets into the tires.Water affects tire performance and destabilizes tire pressure at track speeds. Racers started bringing nitrogen because it is dry in the tank. Dry air performs better.
Whole air from a stable source with an air dryer works just as well as nitrogen alone. For those who disagree, I suggest that you continue to pay for nitrogen. Heck, some places charge for air anyway and besides, those little green caps display your dedication to good car care.
(and they ARE kinda...Uh...Green!)

I once heard of a guy who sold watered down Kool-Aid at the track with the claim that when the race car was rubbed down with it before a session it would reduce lap times by as much as a couple of seconds. Even after the hoax was exposed some driver's still believed in the stuff and swore by it!
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