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Old 11-26-2011, 11:13 PM   #29
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dzn', I haven't weighed the trailer full or empty. I tried but there are no scales in the county anymore and by the time I've left the county, I don't care anymore. GVWR is 7,300 lbs.

Do you have 3 axles? Each tire on yours may have less weight than mine. I believe Moosetags has his tires at 72 lbs., but I could be wrong. We both have 25's, but I don't know how close his is in weight.

Pressure is determined by a gauge which may be wrong. There's a 3 lb. (about 4%) difference between my hand held gauge, the TPMS and the 12 v. compressor's gauge.

Gene

You are correct, Gene. I do run the LT's at 72 psi. Our 25FB tips the scales at 7400# ready to camp.

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Old 11-27-2011, 07:21 AM   #30
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My 28' Safari has a gvwr of 7300 also but I did the scales on a fully loaded camping trip and found that it weighed about 6400. Only 5500 was on the wheels and the rest on the truck. That works out to less than 1400 per tire assuming loading is equally displaced. Even with a flat you would still be under the load rating of my 15" Michelins. In any case ST tires don't fail because of overloaded trailers. They suffer tread separations apparantly at any load and pressure.
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Old 11-27-2011, 07:26 AM   #31
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This is a valid question and I hope others may share an opinion on this. The owner's manual that came with my trailer says it is allowable to remove the failed wheel and drive up to 100 miles not exceeding 30 mph. Doing the math for my trailer as weighed and the ST225/75/15 LRE tires, the solo tire would be carrying 37% above rated capacity. It seems reasonable to use a 15" spare to augment the other 3 or 5 in a pinch vs no support at all. That seems comparable to using the donut spare we're so used to on our cars.
That's exactly what I was thinking.
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Old 11-27-2011, 07:28 AM   #32
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I wonder if you could find a donut that would fit a trailer axle?
That would be the answer, but I have never seen a donut for trucks (higher load rated). They are all apparently for cars and not rated for more than a C load rating. Anybody else seen one capable of ....say....2200lbs?
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Old 11-27-2011, 07:33 AM   #33
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Originally Posted by CrawfordGene View Post
dzn', I haven't weighed the trailer full or empty. I tried but there are no scales in the county anymore and by the time I've left the county, I don't care anymore. GVWR is 7,300 lbs.

Do you have 3 axles? Each tire on yours may have less weight than mine. I believe Moosetags has his tires at 72 lbs., but I could be wrong. We both have 25's, but I don't know how close his is in weight.



Pressure is determined by a gauge which may be wrong. There's a 3 lb. (about 4%) difference between my hand held gauge, the TPMS and the 12 v. compressor's gauge.

Gene
No, I have 2 axles. Last time I weighed, I was at 7600# on the axles, but I have added stuff to the trailer and stuff to the truck bed since. I gotta be getting close to 8000#. I need to weigh again next spring.
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Old 11-27-2011, 09:15 AM   #34
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Could you please explain what "zero" offset means?

[QUOTE=CrawfordGene;1076530]We changed to 16" Michelin LTX tires a couple of years ago and are very happy with them. We now have something like 24,000 miles on them and they are wearing much better than the Marathons did. I have been running 68 lbs. in them, but have increased it to 72 as the edges were wearing slightly faster than the centers. The Marathons lost air despite changing valve stems. The Michelins do not lose air.

We got the same wheels Moosetags did. They come from Tredit, a tire and wheel company in Indiana that Airstream gets supplies from. They are not the only company that has similar wheels. Just make sure they are rated for Load Range E tires and have 0˚ offset.

What does this refer to?

Many thanks,

Lin
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Old 11-27-2011, 09:35 AM   #35
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Offset is the distance from the centerline of the wheel to the plate with the mounting holes. A zero offset means the plate is centered in the wheel. The sketch was snagged from Wikipedia.
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Old 11-27-2011, 12:21 PM   #36
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Silver' is correct and explains it better than I could. Some people put wheels on that do not have 0˚ offset, but that will shift weight off center and I would think that would put extra strain on the bearings and other parts. Zero offset has been the standard for some time on Airstreams, but it is best to check because sometime in the past the offset may have been different.

I have driven about a 1/2 mile on 3 wheels when a bearing went and I had to remove the wheel (actually it removed itself when I touched it). Thinking about the extra weight on the remaining wheels I went very, very slowly and fortunately the campground I was looking for was very close. Had I had to go further, I would have added air to all three tires to carry more weight. Tires can hold a lot more pressure than "cold pressure" and since you have to go slowly, not a lot of pressure will build up.

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Old 11-27-2011, 01:08 PM   #37
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I know that this discussion has been going on for a long time now - and I'm not trying to start another feud - but, if the LT tires are superior to the ST tires, I'll pose the question once again -"Why does Airstream continue to use ST tires?" Serious and thoughtful answers only please!
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Old 11-27-2011, 01:23 PM   #38
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They are cheaper and Airstream does not change very fast.

They will put 16" wheels and Michelin tires on as an option if you want to pay a lot extra.

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Old 11-27-2011, 01:59 PM   #39
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I know that this discussion has been going on for a long time now - and I'm not trying to start another feud - but, if the LT tires are superior to the ST tires, I'll pose the question once again -"Why does Airstream continue to use ST tires?" Serious and thoughtful answers only please!
Knowing how most company's operate nowday's you have to ask?
Its all about the almighty DOLLAR!!!!!!!!!!!
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Old 11-27-2011, 02:39 PM   #40
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Since my 2008 Greenball 15's are showing some corrosion anyway, I'll probably switch to Tredit 16's...T02

Tredit also has a galvanized steel wheel that I'll check out for a spare... Spoke
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Old 11-27-2011, 02:49 PM   #41
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Our 2008 wheels had clear coat peeling in several places on each one. They looked pretty bad and that sped up what we had been thinking about—going to 16" and getting better tires. We like the pattern with holes in the wheels rather than spokes—and they are easier to clean.

Airstream has used the same pattern in some models at various times. I think at the time the more expensive trim lines had the wheels with holes, so it was an upgrade in two ways.

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Old 11-27-2011, 02:50 PM   #42
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Thank you.

Quote:
Originally Posted by Silver Goose View Post
Offset is the distance from the centerline of the wheel to the plate with the mounting holes. A zero offset means the plate is centered in the wheel. The sketch was snagged from Wikipedia.

Gene, Silver Goose, and other posters to this thread,
Thank you for all the questions and answers, this subject is so confusing.
There are so many different tires out there. Without reading this thread I believe I would of just replaced my ST because, I did not know what the correct tire was to purchase.

Lin.
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