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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 The OP is now using different load range tires (50 to 65 max cold psi) so the sticker is no longer applicable.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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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.
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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Old 05-15-2018, 11:04 AM   #11
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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.
I'm guessing he had junk tires...perhaps maybe TowMax (AKA - BlowMax) Power Kings.

With what the OP has stated, he can't go wrong keeping those new tires at 65 psi.
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Old 05-15-2018, 12:31 PM   #12
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New tire pressure

Always use the maximum tire pressure states on the tire, I believe is what the tire people will say. Your trailer is likely heavier than you think!

Quote:
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?
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Old 05-15-2018, 12:53 PM   #13
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Is the search button broken or something?
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Old 05-15-2018, 12:54 PM   #14
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Lots of information "out there", a lot of it contradictory too. But from what I am hearing here, and other places on the net, I'm going to inflate to 65 psi and go with that. Thanks all.
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Old 05-15-2018, 02:03 PM   #15
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I was told by the dealer to run them at 55 PSI. Now checking with FR. Tires say 65
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Old 05-15-2018, 02:12 PM   #16
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I was told by the dealer to run them at 55 PSI. Now checking with FR. Tires say 65
I asked FR a tire question when I received 15" wheels and tires instead of 14". The reply I got was "Forest river can only give recommendations on products your unit was manufactured with."
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Old 05-15-2018, 03:03 PM   #17
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I posted earlier in this thread that dealer told me to run tires at 55 PSI. Forest river just emailed me back and said 65 PSI which is what the tires say. Wished I knew earlier I have been running them at 55 PSI.
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Old 05-15-2018, 03:12 PM   #18
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Why would you run any pressure other than what the tire manufacturer calls for to support a given load?

There is no magic, smoke or mirrors to this decision.
Max inflation is simply that... the maximum weight the tire will carry at that inflation.
No reason to run the max inflation if you are not loading the tire to its capacity.

Tire manufacturers publish inflation charts to show what pressures are to be run in a tire for the load it bears. Find one for your tire brand and use THEIR recommendation for the loaded weight of your R/V.
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Old 05-15-2018, 03:31 PM   #19
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Wonder what the OP didn't like about THIS answer?

or didn't read THIS thread

or THIS thread?

I guess the search function is too much work for a lot of posters.

Some of us can only spend 3 - 5 hours on line answering the same question over an over again and again.
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Old 05-15-2018, 03:49 PM   #20
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No reason to run the max inflation if you are not loading the tire to its capacity.
There's no reason not too as well. Especially when people tend to underestimate their load, and their loads are within 500lbs. of the next charted figure.

I mean, I wouldn't fill to 65psi if I was only towing a 1,000 lb trailer, but when it's a difference between 6,000 or 7,000... fill them up. It's not going to hurt a thing and only going to make the tires run cooler.
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