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Old 05-15-2018, 09:04 AM   #1
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Yet another tire pressure question

My "old" tires were china bombs with a max inflation of 50 psi, which is what I put in them. The new Carlisle LR D tires say max psi 65#. My trailer is not a heavy trailer, maybe 7000 lbs loaded. I'm thinking of maybe 55 psi to start. Any idea where I could check to see if this is reasonable or if I should go to maybe 60 psi?
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Old 05-15-2018, 09:20 AM   #2
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Follow the recommendation on the vehicle ID sticker. It shows the appropriate psi and tire size for your unit. If you can find the sticker, or it's unreadable, contact Forest River for the correct info. That will let your tires wear properly.
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Old 05-15-2018, 09:26 AM   #3
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Follow the recommendation on the vehicle ID sticker. It shows the appropriate psi and tire size for your unit. If you can find the sticker, or it's unreadable, contact Forest River for the correct info. That will let your tires wear properly.
That sticker is only for the OEM tire load range and size. The OP is now using different load range tires (50 to 65 max cold psi) so the sticker is no longer applicable. Search this forum or any forum for about a billion entries on this subject.
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Old 05-15-2018, 09:28 AM   #4
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Ok. Mine uses heavy load range E tires, stock. But it triple 7000# axles.
Maybe a knowledgeable tire dealer could recommend a correct pressure for the GVW. And yes, there are tire pressure charts to be found online.
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Old 05-15-2018, 09:37 AM   #5
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When in doubt...put what is listed on the side of the tire!
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Old 05-15-2018, 09:42 AM   #6
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When in doubt...put what is listed on the side of the tire!
A guy I know put the max psi listed on the side of the tire. He was fully loaded, pulling in the heat of summer, and blew 3 tires in 1000 miles.
I'm not a tire guy, and can only go by the charts and experience.
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Old 05-15-2018, 09:50 AM   #7
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A guy I know put the max psi listed on the side of the tire. He was fully loaded, pulling in the heat of summer, and blew 3 tires in 1000 miles.
I'm not a tire guy, and can only go by the charts and experience.
That is just a bad example trying to prove an incorrect point.
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Old 05-15-2018, 10:24 AM   #8
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Originally Posted by dlwilliams48 View Post
My "old" tires were china bombs with a max inflation of 50 psi, which is what I put in them. The new Carlisle LR D tires say max psi 65#. My trailer is not a heavy trailer, maybe 7000 lbs loaded. I'm thinking of maybe 55 psi to start. Any idea where I could check to see if this is reasonable or if I should go to maybe 60 psi?
You don't have to take my word as gospel, but I used to work in the industry (turning wrenches on school busses and tires).

Fill your tires to 65 psi. At 7000lbs loaded, your old tires were at their maximum.

When you fill your new ones to 65, they will handle the weight better, stay cooler, and the contact patch difference between 55 and 65 is imperceptible.
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Old 05-15-2018, 10:34 AM   #9
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Originally Posted by otrtrucker View Post
A guy I know put the max psi listed on the side of the tire. He was fully loaded, pulling in the heat of summer, and blew 3 tires in 1000 miles.
I'm not a tire guy, and can only go by the charts and experience.
There really isn't any way to judge exactly what happened without more information, but there's got to be more going on like:

Trailer was overloaded
Tires were previously worn or damaged
Tires were previously underinflated and damaged
Tires were old

There is virtually no possible way for 3 tires to be inflated to a rated pressure, to blow unless they're mistreated. Even if he inflated them at the highest rated pressure and only put a small amount of weight, those tires would be fine.
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Old 05-15-2018, 10:42 AM   #10
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Here's an inflation chart for RV tires:

Tire Inflation Chart
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