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Old 08-24-2009, 02:35 PM   #1
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Goodyear Marathon Tires

Where do I find the manufactured date on my tires and if the tread looks good etc. at what point do I need to replace them due to age?
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Old 08-24-2009, 02:49 PM   #2
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Tire Tech Information - Determining the Age of a Tire
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Old 08-24-2009, 03:13 PM   #3
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On my US made Marathon's it is marked on the inside as mounted, so you have to crawl under the trailer to read the manufacture date.
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Old 08-24-2009, 03:16 PM   #4
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More information here: Tire Tech Information - Tire Aging – Part #1
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Old 08-24-2009, 03:36 PM   #5
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Blowout Georgia I95

on our trip to NS & PEI the first day out the tread completely blew off the Marathon. Used for less than 2 years at least every 6 weeks. Changed all 4 to Carlisle Es 10 ply.
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Old 08-24-2009, 04:10 PM   #6
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There are many threads on Marathons, tire age, and such. Try these:

http://www.airforums.com/forums/f438...old-54644.html

http://www.airforums.com/forums/f438...ice-52955.html

http://www.airforums.com/forums/f438...ons-54985.html

This is probably more than you wanted to know. There's a very long Marathon thread I couldn't find.

Date of manufacture may be on the inside or outside depending how they were mounted.

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Old 08-24-2009, 05:55 PM   #7
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Quote:
Originally Posted by chaimemet View Post
on our trip to NS & PEI the first day out the tread completely blew off the Marathon. Used for less than 2 years at least every 6 weeks. Changed all 4 to Carlisle Es 10 ply.

I too am running the Carlisle E's but I only inflate them to 65 cold vs the 80 recommended. Once hot the pressure is up to 70psi (100* outside temp at 60 mph sustained.)

I know there are concerns that the E rated tires will beat the trailer to death but according to my weight there is two thousand pounds on each tire.

I will keep reporting on them.

Thanks Vin
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Old 11-01-2010, 10:30 AM   #8
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After a year?

Airslide, how are the Carlisles holding up after the 2010 season?

Just curious, I will be needing tires by next spring.
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Old 11-01-2010, 01:01 PM   #9
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Originally Posted by Airslide View Post
I too am running the Carlisle E's but I only inflate them to 65 cold vs the 80 recommended. Once hot the pressure is up to 70psi (100* outside temp at 60 mph sustained.)

I know there are concerns that the E rated tires will beat the trailer to death but according to my weight there is two thousand pounds on each tire.

I will keep reporting on them.

Thanks Vin
Don't know how old they were, but I have a friend who is in our WBCCI unit that has had two blowouts on Carlisle E rated ST tires this year on his 34 footer. I don't believe they are the panacia that some folks believe.
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Old 11-01-2010, 01:33 PM   #10
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Hi,

Not sure how others are finding the quality but after a couple seasons on these Carlisle's I'm very happy. The wear pattern is completely even and there are no bubbles on the sidewalls. I run the tire pressure at 65psi and check them before and after each trip. So far so good. Im also very careful to not pinch the sidewall when coming down my driveway or out on the road. Once the sidewall is compromised and air is allowed to tranfer into the outer ply I think its just a matter of time before a blow out.

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Old 11-01-2010, 04:05 PM   #11
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Thanks, slide. My 30' of course, isn't quite as heavy as yours, but I asked because after digesting virtually ALL of the posts and reading other material, as well as going door to door to the tire shops, I have come to the conclusion that LRE at 65PSI is where I want to go. Still kind of waffling on brand. Probably Carlisle or Maxxis.
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Old 11-01-2010, 04:26 PM   #12
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Quote:
Originally Posted by dznf0g View Post
Thanks, slide. My 30' of course, isn't quite as heavy as yours, but I asked because after digesting virtually ALL of the posts and reading other material, as well as going door to door to the tire shops, I have come to the conclusion that LRE at 65PSI is where I want to go. Still kind of waffling on brand. Probably Carlisle or Maxxis.
I'm in exactly the same situation as you - I hope to change my five year old Marathons for Maxxis E rated if I can get them when we are in Tucson this winter.

My fall back position if I cannot get Maxxis will be Carlisle E's I guess, although I'm a bit concerned that when I did a search for reviews of Carlisle trailer tires on the internet (not on this forum) I seemed to be reading mostly bad news.

I have heard a little about a brand called Towmaster, but don't know much about them and how readily available they are.

In any event, I plan to go with E rated on our 2005 Classic 30.

Brian
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Old 11-01-2010, 05:23 PM   #13
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your post about the 65psi and rising to 70psi @ 100 is encouraging. I found this article this morning which puts to rest the pressure issue for me. It looks at determining your cold pressure by trial and error by monitoring pressure rise while traveling. With TPMS this process would be much easier.

You're right in that 10% rise range at 65PSI cold.

The Vintage Airstream Life » Blog Archive » Determining Ideal Tire Pressure

The only thing I think I would add to the article is a calculated factor for ambient temp. rise. With TPMS it's probably not an issue since you can readily determine when tire temp stabilizes. (I have found tht's between 1 - 2 hours of driving). Since tire pressure rises approx. 1 degree for every 10 degrees of (ambient) temp rise, if you take a reading at 6AM at 60 degrees and wait till 2PM to take another reading at 100 degrees you'll be off by about 4 degrees in your calculations.

I know this doesn't make much sense untill you read the article, but Slide seems to be right in that sweet spot for temp/pressure vs. ride quality. This answere a lot for me.
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Old 11-01-2010, 05:46 PM   #14
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the notion of "dialing UP" tire inflation pressures has been around a long time.

in fact we've addressed it HERE in the forums dozens of times over the years...

as an example see post #22 from this 2005 thread...

http://www.airforums.com/forums/f438...tml#post197695

it's an old school approach and CAN work, but takes a LOT of tinkering.

really there is no valid reasons to follow that approach in modern daze.

IF planning to use ANY PRESSURE less than the max/sidewall for ST tires...
__________

weigh the rig.

start with pressures based on one of the manufacturer tables...

keep in mind these tables are NOT recommended inflation guides.

ADD 5-10 psi if planning to drive OVER 65 mph (not to exceed sidewall pressure ratings)...

and be done with it.
_______

IF using a tpms that provides temps, one can fiddle a lot more.

but be advised that south side tires will run 10-20 degrees higher in daytimes...

and tires with HIGHER loads will run hotter.

or tires with ANY brake, bearing, hub issues may run hotter.

and so on,

there are lots of reasons for variations that will BEFUDDLE tinkering with warm tire inflations.
_______

the old "dial it UP" wisdom for adding air during travel was really intended for passenger cars/tires...

and from the earliest days of radial tire use

when LOOKING at the sidewall bulge was confusing compared to bias ply tires.

cheers
2air'
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