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Old 12-11-2013, 01:51 PM   #29
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I am speaking hypothetically.
I can't understand why people think they need 16" wheels and tires.
Why do people think the factory supplied 15" wheels and tires are not good enough.
I understand the bad rep Goodyear Marathons have.
I know from personal experience that Carlisle trailer tires are no good.
I also know that Michelins are expensive and have a long tread life, which is a moot point because I will never put enough miles on them before they dry rot to justify the price.
I just can't get anyone to explain to me in a way I can understand why the factory supplied tires and wheels are inadequate or why I should want or need 16" wheels.
I think I should be able to buy 15" tires that are better than Good Year Marathons or Carlisle trailer tires, but are less expensive than. Michelins.
I think sometimes people go overboard with bigger is better (trucks, wheels, horsepower, torque) and others jump on the band wagon.
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Old 12-11-2013, 01:52 PM   #30
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...a total of 8800#...
When hitched there is only 7400# on my trailer axles...
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Old 12-11-2013, 01:57 PM   #31
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Six times 1985 pounds derated capacity of 15" Michelins is 11,910 pounds while four have 7,940 pounds capacity. My empty weight is 7,365 pounds before second A/C and 50 amp service or over 400 pounds in batteries alone for the aftermarket solar system. We have yet to add 54 gallons of water, the 15" tires are under capacity for two axles and 10,000 pounds GVW.
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Old 12-11-2013, 02:15 PM   #32
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I know the GVW is 10,000#- I will never have that much on it. The scale ticket is the weight fully loaded with propane, groceries, clothes, firewood- everything- ready to camp- even a bunch of extra stuff for an auction-
7,940 actual capacity
7,440 actual weight- cases of soft drinks, water, enough clothes to stay gone a month-
normal trips I weigh less- the extra stuff for the auction-
I see lots of Airstreams in campgrounds with the original 15' wheels. Those owners have never considered putting 16" wheels on their trailers.
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Old 12-11-2013, 02:18 PM   #33
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Quote:
Originally Posted by m.hony View Post

So- I have a Classic 30 with 15" wheels, actual weight on trailer axles 7,440#, 10,000# GVW- they made it at the factory and sold it with inadequate tires/wheels? Could that ever come around to bite 'em? Hmmm...
You probably have GYMs ST225 which have a higher load capacity (2540/ea., 15,240 for all 6) and can handle the trailer weight.
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Old 12-11-2013, 02:20 PM   #34
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Maybe everyone doesn't need 16" wheels and tires- Maybe I don't-
Maybe people who boondock need 16" wheels because they have more batteries, solar, onboard water? Maybe they are more likely to approach the 10,000# GVW? I never will.
My trailer is probably 7,500# on the tires while parked because some of the weight is on the tongue, just like when hitched to the truck- only difference is whatever weight is transferred to the front axle of the truck when hitched-
Also, the 65 limit on the sidewall doesn't bother me as I won't be exceeding that anyway.
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Old 12-11-2013, 02:23 PM   #35
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You probably have GYMs ST225 which have a higher load capacity (2540/ea., 15,240 for all 6) and can handle the trailer weight.
I have a 2 axle trailer, but 2,540 x 4 is 10,160#- trailer GVW is 10,000#-
What's the problem? Why should I want to switch to 16" wheels and tires?
I just don't get it.
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Old 12-11-2013, 02:25 PM   #36
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So 6 (Triple Axle) of the Michelin LTX (p) 235/75/R15 are adequate for my 34' with a GVWR of 9900#, while not adequate for a 31' Double Axle of the same weight? Just trying to clear the fuzzy from my head...
9900/6=1650 - so long as the derated value of the tire exceeds 1650, you should be fine. If both trailers have a GVWR of 9900, in theory, both tri-axle trailers should be fine with the p Michelin which is sidewall stamped at 2183 and derated handles 1984 per tire. I though most tri-axle folks who make the switch go with 16s. Are there very different weights??
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Old 12-11-2013, 02:31 PM   #37
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People keep tires on a trailer longer than five years? Really? I never would have imagined that. I bought the Michelin 15" LTX MS/2 about a year ago. We have a lot of miles on them already - maybe 10,000. They look brand new still. But, when five years old, I will swap them for a new set no matter what they look like. I thought most people did the same. How long are people running the same tires? I know there was the one guy the other day who reported tires from 1992, but I assume that is rare.
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Old 12-11-2013, 02:34 PM   #38
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Quote:
Originally Posted by m.hony View Post

I have a 2 axle trailer, but 2,540 x 4 is 10,160#- trailer GVW is 10,000#-
What's the problem? Why should I want to switch to 16" wheels and tires?
I just don't get it.
There may not be a problem.

I won't lie - the talk in this forum and others about the perceived GYM problems scared the heck out of me. I had no problems with them and switched to the 15" Michelins more out of psychological stress than any direct evidence of bad tires.

You may be fine as is and if you're happy - many others seem to be too so hit the road, watch and feel for damage, keep them at 65 psi, stay under 65mph and enjoy yourself!

Even if you wanted to change to Michelins, you said fully loaded for camping you're at 7400 I believe, yes? 16s wouldn't be necessary. You'd be close with the 15s at 7936 (1984x4) but the derated 15s would do the job. My 27fb fully loaded for camping is 5880 so I'm very comfortable with the 15s.
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Old 12-11-2013, 02:36 PM   #39
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2 topics - weight & Cost of Converting to 16 inch

Quote:
Originally Posted by m.hony View Post
...a total of 8800#...
When hitched there is only 7400# on my trailer axles...
Not to be a putz... but how much of the time are you hitched vs. parked. If you're PARKED and the tires are overloaded doesn't the overload count?

We all know that the stabilizer jacks aren't meant to be load bearing... How much weight rests on the four tires? Does the jack carry as much tongue weight as the hitch receiver does?

Inquiring minds want to know.

MICHELIN 16 inch conversion - I converted to 16 inch rims on Airstream #2 about 2 years ago. If I had it to do over I'd price them from the FACTORY before going through ordering them separately and paying someone to mount them. Not sure the same situation applies now, but when I did it, I could have saved big bucks (hard to believe but true) by ordering them from Airstream in Jackson Center.
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Old 12-11-2013, 02:44 PM   #40
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No, you do need 16" wheels. You can run the GYM trailer tires rated at about 2500 lbs per tire. However you can not get a 15" LT or P tire with anything close to that rated capacity. The switch to 16" wheels is usually in an effort to get different tires than the ST tires from the various makers. The trailer I pull the most is lightweight and I run the 15" Michelin XL tires on it. I am several thousand pounds under the max load. My other trailer is a 32' that I do not pull much. I currently have 4 year old GYM's on it. Not sure what I am going to do to replace them. Probably just another set and hope and worry for the few hundred miles a year I log on it. I have seen a 32' with the 15" Michelins on it and they were doing just fine.
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Old 12-11-2013, 03:15 PM   #41
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My understanding is as Bill M has explained.

I switched to 16" wheels because rightly or wrongly I wanted to get away from using
ST tires and switch to the LT tires.

I suppose it is early days yet and maybe the jury isn't in yet as to whether they are really more reliable than ST tires. But many people here whose opinions I respect seemed to feel so - and when Airstream started offering them as an upgrade, that pretty much convinced me to give them a try since I needed new tires anyway.

Having made that decision, I felt that I did not want to have wheels or tires that were rated at less than the GVW of my trailer - whether I carry load up to the GVW or not.

I don't believe I could get a 15" LT tire that would do that - hence the move to 16" wheels
in my case.

I guess I do fall into the category of people wanting to have more capacity than I will actually use - both in tow vehicles and tires - just seems to me to be wise for longevity to run things at less than their maximum capacity.

That's my excuse anyway!

Brian


PS - I did 3 GYM's lose tread halfway across Texas with our previous SOB trailer. Our Airstream also GYM's when we bought it and they still looked ok (apart from bumpy looking sidewalls, which I was told was ok) when I took them off after they were about 4.5 years old.
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Old 12-11-2013, 03:24 PM   #42
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Quote:
Originally Posted by Foiled Again View Post
Not to be a putz... but how much of the time are you hitched vs. parked. If you're PARKED and the tires are overloaded doesn't the overload count?

We all know that the stabilizer jacks aren't meant to be load bearing... How much weight rests on the four tires? Does the jack carry as much tongue weight as the hitch receiver does?

Inquiring minds want to know.

MICHELIN 16 inch conversion - I converted to 16 inch rims on Airstream #2 about 2 years ago. If I had it to do over I'd price them from the FACTORY before going through ordering them separately and paying someone to mount them. Not sure the same situation applies now, but when I did it, I could have saved big bucks (hard to believe but true) by ordering them from Airstream in Jackson Center.
Up to a point overloaded when parked doesn't count, one of the tire experts was saying that if you were 10% under the load rating you could increase the speed rating from 65 to 75 and if you reduced the speed you could increase the load rating (this is why ST tires are rated with a higher load rating and lower speed rating then similar LT tires) so if you don't overload the tires by more then 20% while stationary it shouldn't cause problems (sort term anyway like having 10 people in the trailer, maybe not using it as a storage shed).

As for the weight on the tires when parked it should be less then when hitched with WD. WD sends some of the load to the trailer tires and when tongue weight is measured at the jack it is higher then when it is measured at the coupler. This means the receiver would be carrying less weight and sending some of that smaller amount back to the trailer axles.
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