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Old 06-22-2018, 07:35 AM   #1
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Marathon Load inflation tables

I have a 2017 FC 19 with factory installed Goodyear Marathon tires. I understand that the Marathons have been discontinued with Goodyear now offering the Endurance model.

I have been looking for Load inflation tables for the Marathons that are on my trailer but all that comes up in my searching are tables for the Goodyear Endurance.

Does anyone have a line on load inflation tables for the Marathons?
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Old 06-22-2018, 07:58 AM   #2
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I cannot help with the load tables for Marathons, but there is a reason Goodyear discontinued them. There are endless threads here on Marathon tire failures and the damage they caused to the AS. I have a 2015 and my One of my Marathos developed hairline cracks in the sidewalls, just shy of four years old from the manufacturing date stamped into the side wall. I always ran them at 65 lbs pressure cold, and carry a Viair air compressor to make sure of that. When I found the cracks a couple of weeks ago, I immediately went to discount tire and switched to the Endurance. Since the switch, the trailer rides better, smoother, in spite of the higher tire pressure od 73 lbs cold.

Mike
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Old 06-22-2018, 08:00 AM   #3
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Those tables don’t apply to trailer service.

Inflate to maximum per tire sidewall.

Argue it with retired tire engineer Tireman9 if you want.
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Old 06-22-2018, 08:25 AM   #4
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When I went through this, the chart for Marathon was the same as for Endurance. Neither made sense. It's based on load per tire.
The chart, if you follow it, calls for something like 35 pounds pressure.
Since we don't believe that, we just pick a number we're comfortable with.

Keep in mind the Marathon is a speed rated "D" which means 65 mph max.

Quote:
Originally Posted by slowmover View Post
Those tables don’t apply to trailer service. Inflate to maximum per tire sidewall.
There are charts for trailer tires.

In the chart below, the column "single" refers to single vs. dual, not single axle.
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Old 06-22-2018, 08:38 AM   #5
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Quote:
Originally Posted by Mollysdad View Post
When I went through this, the chart for Marathon was the same as for Endurance. Neither made sense. It's based on load per tire.
The chart, if you follow it, calls for something like 25 pounds pressure.
Since we don't believe that, we just pick a number we're comfortable with.



Rather unusual to have tires so large that the table suggests such a low inflation.


No matter what you believe about inflation NEVER go below the lowest inflation as that number is intended to keep the tire mounted on the wheel in normal driving.


Backing a trailer into a campground space can also tear tires off wheels even at much higher inflation levels.


If you want to maximize tire durability you need to lower the Interply Shear that radial tires experience. Trailers see 24% higher shear force than motorhomes and that is why I strongly recommend that multi-axle trailers ALWAYS inflate tires to the tire sidewall number.


Or ignore my recommendation and just don't complain when you have a tire failure. You are free to choose.


Have a nice day
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Old 06-22-2018, 12:16 PM   #6
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Quote:
Originally Posted by Tireman9 View Post
Rather unusual to have tires so large that the table suggests such a low inflation.


No matter what you believe about inflation NEVER go below the lowest inflation as that number is intended to keep the tire mounted on the wheel in normal driving.


Backing a trailer into a campground space can also tear tires off wheels even at much higher inflation levels.


If you want to maximize tire durability you need to lower the Interply Shear that radial tires experience. Trailers see 24% higher shear force than motorhomes and that is why I strongly recommend that multi-axle trailers ALWAYS inflate tires to the tire sidewall number.


Or ignore my recommendation and just don't complain when you have a tire failure. You are free to choose.


Have a nice day
^
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Ran two sets of GYM's at 65psi, 60-65mph, one nail, no catastrophe's in 14yrs. 👍

Will run the GYE's at 80psi at the same speed.🤗

Bob
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