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Old 07-26-2010, 08:02 PM   #1
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Laughed when I said Marathon

I'm adjusting brakes, packing wheel bearings and ready to replace tires on my 1976 31' Sovereign. The tires currently on the trailer are Good Year Marathon ST225 / 75R15, Tread 4 ply, sidewall 2 ply, Max Load 2540 Lbs @ 65#, Load rating D. I called my favorite tire shop and asked for Good Year Marathon tires and he laughed at me. I called my second in line tire shop and asked for Good Year Marathon and he said, "Noooooooo!"

Why are Good Year Marathon tires favored by Airstream owners?

2540 Lbs can't be the right tire for this trailer.

On the brake cleaning, the drums and shoes look like new and I'd bet the farm they're OEM. I have two wheels apart and the inside seal is leaking on one wheel. The inside of the drum where the magnet runs was coated in grease. I'll replace the seal on the other two as well. This trailer has been sitting. It wasn't a trip trailer.
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Old 07-26-2010, 09:36 PM   #2
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Hey Splitrock!

The subject of tires here on the forum is very contentious.

The threads will keep you reading/entertained for days.

(2air, where r u)

The reasons for Airstream owners choosing Goodyear Marathons is as clear to me as why people swear placing a bar of soap under the mattress prevents leg cramps.

Many owners have switched out to 16" rims and Michelin 16" LTX tires.

By the way, I'm headed to Sioux Falls next week, I would be happy to swing by and you can look at my 16" rims and tire install.

Best, Michael
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Old 07-26-2010, 09:45 PM   #3
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Quote:
Originally Posted by Splitrock View Post
I'm adjusting brakes, packing wheel bearings and ready to replace tires on my 1976 31' Sovereign. The tires currently on the trailer are Good Year Marathon ST225 / 75R15, Tread 4 ply, sidewall 2 ply, Max Load 2540 Lbs @ 65#, Load rating D. I called my favorite tire shop and asked for Good Year Marathon tires and he laughed at me. I called my second in line tire shop and asked for Good Year Marathon and he said, "Noooooooo!".

There are many threads on GYM tires both bad and good. 3 Goodyear Marathons failed, found before disaster. It seems that they had a real bad tread seperation problem with tires made in China. I won't buy anymore and the following was my experience.

04 Goodyear Marathons - a near disaster!
Just got back from a 1000 mile trip to southern KY and on the way south I had a tire blow up on my 65 vintage Safari. It was very scary when I looked in the side mirror and saw the tire go - smoke and all. They are 8 year old Goodyear Marathons load range D. The tread let loose from the tire. I was able to move to side of the xpress way just as the tire let go and dropped down to the skid rod. Wow! am I glad the skid rod is there. No damage ! Put on spare and made it into Dayton, Ohio and replace both tires with load range E and inflated (diferent brand) to 65 lbs. (max is 80). My recommendation is to update tires sooner than 8 years or you might have to go through my experience.

Tim
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Old 07-26-2010, 09:47 PM   #4
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Originally Posted by ArtStream View Post
Hey Splitrock!

The subject of tires here on the forum is very contentious.

The threads will keep you reading/entertained for days.

(2air, where r u)

The reasons for Airstream owners choosing Goodyear Marathons is as clear to me as why people swear placing a bar of soap under the mattress prevents leg cramps.

Many owners have switched out to 16" rims and Michelin 16" LTX tires.

By the way, I'm headed to Sioux Falls next week, I would be happy to swing by and you can look at my 16" rims and tire install.

Best, Michael


I'd love to meet up. I'll buy the coffee. I'll pm ya my info.

By the way, did they say what brand of soap under the mattress prevents them leg cramps?

Gary
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Old 07-26-2010, 10:12 PM   #5
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Originally Posted by tkasten;876116There are many threads on GYM tires both bad and good. [URL="http://www.airforums.com/forums/f438/3-goodyear-marathons-failed-found-before-disaster-65178.html"
3 Goodyear Marathons failed, found before disaster.[/URL] It seems that they had a real bad tread seperation problem with tires made in China. I won't buy anymore and the following was my experience.

04 Goodyear Marathons - a near disaster!
Just got back from a 1000 mile trip to southern KY and on the way south I had a tire blow up on my 65 vintage Safari. It was very scary when I looked in the side mirror and saw the tire go - smoke and all. They are 8 year old Goodyear Marathons load range D. The tread let loose from the tire. I was able to move to side of the xpress way just as the tire let go and dropped down to the skid rod. Wow! am I glad the skid rod is there. No damage ! Put on spare and made it into Dayton, Ohio and replace both tires with load range E and inflated (diferent brand) to 65 lbs. (max is 80). My recommendation is to update tires sooner than 8 years or you might have to go through my experience.

Tim

Hi Tim,

Thanks for the post. I thought a 8 ply tire would be more appropriate for this trailer. Maybe I'm wrong. I've got 6 ply on my Haulmark enclosed trailer with a third the weight. I haven't settled on a brand yet but I definitely want a heavier tire. Everything is pretty heavy duty until I got to the tires. The wheels are solid, and the brake drums must weigh 50 pounds apiece.

What tire did you buy?

Gary
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Old 07-26-2010, 10:23 PM   #6
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Originally Posted by Splitrock View Post
Hi Tim,

Thanks for the post. I thought a 8 ply tire would be more appropriate for this trailer. Maybe I'm wrong. I've got 6 ply on my Haulmark enclosed trailer with a third the weight. I haven't settled on a brand yet but I definitely want a heavier tire. Everything is pretty heavy duty until I got to the tires. The wheels are solid, and the brake drums must weigh 50 pounds apiece.

What tire did you buy?

Gary
Gary.

If your present wheels have been equipped with 6 ply tires, for many years, you should not increase the tire rating to an 8 ply.

To do so, will cause the wheels to split around the circumferance, as per most wheel manufacturers.

Also. when a torsion axle trailer has been parked for a long time, usually, but not always, the rubber rods fail.

You can easily check that out yourself, by reading the axle article in the Airstream Central portion of this web site.

Rubber must be exercised to stay alive.

If not, the rubber can solidify or get gummy.

Andy
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Old 07-26-2010, 11:54 PM   #7
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Hi Andy,

The current tires are 4 ply on the tread and two ply on the sidewalls. That just seems lite to me. They're going to be changed because they're checked and two of them don't hold air for more than a week. I wouldn't take em on the road. I plan to remove the rims from the trailer and take them to town for new rubber. But what rubber? That's my question:-)

Gary
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Old 07-27-2010, 12:13 AM   #8
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Originally Posted by Splitrock View Post
Hi Andy,

The current tires are 4 ply on the tread and two ply on the sidewalls. That just seems lite to me. They're going to be changed because they're checked and two of them don't hold air for more than a week. I wouldn't take em on the road. I plan to remove the rims from the trailer and take them to town for new rubber. But what rubber? That's my question:-)

Gary
We recommend what the Airstream factory uses.

For a 31 foot Airstream, Goodyear Marathons load range "D".

You may have to change the wheels., because of the upgraded load range.

Andy
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Old 07-27-2010, 12:16 AM   #9
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hey 'rock...

modern trailer tires (and most radial tires for that matter) do NOT rely on the "ply system' for construction or capacity.

PLYs are a vestige of bias tires where 8 ply really does EQUAL 8 ply.

radial tires are "ply equivalents" meaning the load at max pressure is EQUAL to bias tires made from 6, 8 or 10 ply.

radial st tires are C, D, or E rated and these load tiers CORRESPOND to bias tires that are 6, 8 or 10 ply.
__________

CHECK ALL of the common st tires or LT tires,

NONE of them are actually MADE from 8 or 10 PLYs...

almost ALL of them are exactly as you noted, with tread at 4 and side walls at 2...

some E rated (10 ply equivalent) have 1 more layer, but nowhere near 10

that D rated tire you have is EQUIVALENT in load capacity to an 8 ply bias tire.

but FAR MORE SUPPLE, which is a good thing.

the individual ply or LAYERS may be constructed of THICKER cords or DENSER ply,

rather than relying on baklava like layering.

one thing u are CORRECT about is the 2540 lb per tire NOT being right for that trailer...

it is FAR MORE capacity that the oem tires used in 1976.

4x2540=10160 lbs of load capacity, nearly 4,000 lbs MORE than the tires/axles carry.
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hi michael!

south dakota is a mighty fine place to FLY a kite...

cheers
2air'
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Old 07-27-2010, 06:43 AM   #10
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Quote:
Originally Posted by Inland RV Center, In View Post
Gary.

Also. when a torsion axle trailer has been parked for a long time, usually, but not always, the rubber rods fail.

You can easily check that out yourself, by reading the axle article in the Airstream Central portion of this web site.

Rubber must be exercised to stay alive.

If not, the rubber can solidify or get gummy.

Andy
Andy is correct here. We just got home from our first trip with our new rims, tires and most important new axle (purchased from Inland RV) and the results are like night and day. We did not realize how poor the old axle work if at all. Now it's like we are floating on air. Wow! Check those axles.....Tim
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Old 07-27-2010, 09:01 AM   #11
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After a blowout and 3 other belt separations (all on different wheels) on goodyear marathons we did switch to Sendel 16 inch wheels and Michelin 225-75-16 XPS Ribs...(Light Truck Tires) .I'm trying to forget how much it cost, but they definately run cooler on Florida highways and if anything ride better and I think they may give me some peace of mind... I don't have a lot of clearance front and back, but we have enough...around 3/4 inch... The Goodyear factory representative told me that the Airstream Factory didn't weigh the trailer right and I may have overloaded it...(I have 3300 and change on each side ---) The wheels look really good... As for 16" load range E tires The Airstream Factory is selling a good year tire mounted on a Greenball wheel...I'm running 70PSI --- so Far so good...
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Old 07-27-2010, 09:20 AM   #12
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PS - The comment about the Factory rep I ment as sarcasm..We were running 65PSI in the goodyears and the Airstream was riding almost level... (He absolutely knew we were'nt over loaded or tipped nose down or up)) With the 16s we are about 1/2 inch higher and almost exactly level with a different tow vechicle....
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Old 07-27-2010, 09:36 AM   #13
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I just completed a tire purchase yesterday - I ended up with Carlisle's - "D" rating - identical specs as the GYM's.. Everyone wanted a premium for the Good Year Marathons. I wasn't real crazy about Chinese Carlisle's but my last Good Year Marathon's on a smaller trailer "C" rated were also Chinese. I assumed the "D" rated GYM were also Chinese - I could be wrong.
I've had good luck in the past with Carlisle's on a tandem axle utility trailer and couldn't pass up the price.
Carlisles m/b - $75 each, GYM's - m/b $120 each.
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Old 07-27-2010, 09:42 AM   #14
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I've been running the 225/70R15 Continental Vanco 2 tires for almost a yr. now. Sears has them listed as LT tires. I run on the Florida highways at about 75 MPH and have had no problems (Knock on Wood!) The trailer does sit 1/2" lower with these. Have put about 4,000 miles on them
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