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Old 06-26-2016, 05:25 AM   #1
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Tire air pressure

can some one give me a rough idea of what air pressure I should run. I have an 2006 HR Ambassador DFD. I do not know the weight.
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Old 06-26-2016, 05:28 AM   #2
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Since you don't know your weight which is the best way , there may be a placard ( mine was on the driver side below the drivers window ) that stated minimum pressure required for maximum weight . That would be a start until you can weigh it.
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Old 06-26-2016, 08:02 AM   #3
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Most Pilot/Flying J and Loves truck stops have CAT scales which can weigh your front and rear axle weights. You should do that as soon as convenient.
In the mean time, and because you don't know your weights, you should run the recommended max pressure for the tire. This may not provide the best handling but will be safe.
As mentioned above, the max pressure should be labeled inside on the door frame.
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Old 06-26-2016, 08:13 AM   #4
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If you post this same question, or ask a moderator to move it for you, to the owners forum. (But also add as much model specific information as possible on your coach.) You could get some information from other owners of your rig.

Do get a four corner weight, and then consult the specific tire manufactures recommended PSI for that setting. Many of us add a 'contingency' of 10% above that value, to allow for weight growth while traveling, and minimal lossage of tire PSI while on a trip without having to worry about adding PSI back to the tires.

Until then, confirm that both the size and load range recommendation of the placard in your coach are matching each other, and tun with that placards PSI setting.

Best of luck to you, have fun, be safe,
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Old 06-26-2016, 06:05 PM   #5
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on the posting beside driver seat it says 115psi in fronts and 95 in rears. I guess I will go with that for now.
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Old 06-26-2016, 06:06 PM   #6
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Sounds like a plan until you get it weighed.
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Old 06-26-2016, 06:13 PM   #7
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Quote:
Originally Posted by grizzerly View Post
on the posting beside driver seat it says 115psi in fronts and 95 in rears. I guess I will go with that for now.

That concurs with your GAWR both front and rear, if you still have 275/70R22.5 tires.
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Old 06-26-2016, 06:17 PM   #8
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Quote:
Originally Posted by Selah View Post
Most Pilot/Flying J and Loves truck stops have CAT scales which can weigh your front and rear axle weights. You should do that as soon as convenient.
In the mean time, and because you don't know your weights, you should run the recommended max pressure for the tire. This may not provide the best handling but will be safe.
As mentioned above, the max pressure should be labeled inside on the door frame.
Actually it's NOT! What is there is the MINIMUM pressure to support he maximum rating for the axle just like on the tires.

The pressure on the sidewall of a Michelin RV truck size tire and many others is not the "Maximum" the tire should ever have (unlike car tires) it is the minimum to support the maximum rated carrying capacity of the tire. NHTSA defines a truck tire as those used on anything with a GVWR of 10,000#'s or more.

From the Michelin RV Tire Guide:
Quote:
"If you look at the tire's sidewall, you'll see the maximum load capacity allowed for the size tire and load rating, and the minimum cold air inflation needed to carry the maximum load."
From page 6 of the GoodYear RV Tire and Care Guide:
Quote:
"How much air is enough?
The proper air inflation for your tires depends on how much your fully loaded RV or trailer weighs. Look at the sidewall of your RV tire and you’ll see the maximum load capacity for the tire size and load rating, as well as the minimum cold air inflation, needed to carry that maximum load."
From TOYO:
Quote:
Q: What are the consequences of inflating the tires to accommodate the actual loads?
A: If the inflation pressure corresponds to the actual tire load according to the tire manufacturer’s load and pressure table, the tire will be running at 100% of its rated load at that pressure. This practice may not provide sufficient safety margin. Any air pressure loss below the minimum required to carry the load can result in eventual tire failure.
But then they go ahead and publish a weight/pressure chart allowing lower pressure for RV's!!

From the August 2010 Motorhome Magazine "Tread Carefully" tire article:
Quote:
The maximum load capacity allowed for the size tire and load rating and the minimum cold air inflation needed to carry that maximum load are located on the tire’s sidewall.
From our owners manual:
Quote:
Federal law requires that the tire’s maximum load rating be molded into the sidewall of the tire.
If you look there, you will see the maximum load allowed and the cold air inflation pressure required to carry that stated maximum load. Less air pressure restricts the tire to carry a lighter load.
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Old 06-26-2016, 07:38 PM   #9
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Sigh...
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