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Old 07-11-2014, 08:41 PM   #1
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Tire Pressure by Weight on DP

Can some of you verify what my tire pressures should be?

I have my actual weights from the Cat scales.
Here they are:
Steer Axle 10,080
Drive Axle 17,720
Gross Weight 27,800

Goodyear 275/70R22.5 on this chart:
http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

How would I calculate my tire pressure from the chart?
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Old 07-11-2014, 09:26 PM   #2
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Chart indicates that 85psi would be the minimum required pressure for both front and rear weights.(Goodyear G670RV)
The 85psi on the front would support 10340# which does not give much of a margin above the actual weight. The front tires at 90 psi would support 10800#. Rear tires at 85psi would support 19080#... 85 psi is also the minimum recommended by the chart for those tires.

My axle weights also called for 85psi, I used 90 psi to have a margin for temperature changes and slight losses when checking air pressure etc. I also found I had a more stable ride at 90psi. (G670 275/70R22.5 also)

Most accurate pressures can be determined if you have the individual corner weights for each axle, and adjust the pressure to at least the minimum for the heavier end of the axle. Same pressure at both ends...
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Old 07-11-2014, 09:36 PM   #3
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Quote:
Originally Posted by Hooligan View Post
Chart indicates that 85psi would be the minimum required pressure for both front and rear weights.(Goodyear G670RV)
The 85psi on the front would support 10340# which does not give much of a margin above the actual weight. The front tires at 90 psi would support 10800#. Rear tires at 85psi would support 19080#... 85 psi is also the minimum recommended by the chart for those tires.

My axle weights also called for 85psi, I used 90 psi to have a margin for temperature changes and slight losses when checking air pressure etc. I also found I had a more stable ride at 90psi. (G670 275/70R22.5 also)

Most accurate pressures can be determined if you have the individual corner weights for each axle, and adjust the pressure to at least the minimum for the heavier end of the axle. Same pressure at both ends...

I concur with Hooligan. I would run 90-95 psi all the way around.


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Old 07-11-2014, 09:48 PM   #4
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Thanks guys. Confirms that I was thinking correctly. I do need to weigh one more time with my coach loaded and wife aboard before I head out of town.

I'll bet it rides a lot better once I get that 110 pounds out of it
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Old 07-11-2014, 10:09 PM   #5
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Originally Posted by dan-nickie View Post
Thanks guys. Confirms that I was thinking correctly. I do need to weigh one more time with my coach loaded and wife aboard before I head out of town.

I'll bet it rides a lot better once I get that 110 pounds out of it
Dan, I'm not trying to be a smart a$$, but a coach weight not fully loaded as you would normally travel means nothing. You need to load it with all of your "stuff", fill it full of fuel and the amount of fresh water you plan on carrying, then weigh it and set your weights accordingly.

Then at the first catch you can, get a four corner weight.
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Old 07-11-2014, 10:18 PM   #6
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My 2002 Fleetwood Revolution calls for 110 psi front and rear. Max psi on tires is 120 psi. Pressure does not rise or the temp either.
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Old 07-11-2014, 10:43 PM   #7
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4 corner weight is the sensible way to go.
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Old 07-11-2014, 11:27 PM   #8
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Dan, I'm not trying to be a smart a$$, but a coach weight not fully loaded as you would normally travel means nothing. You need to load it with all of your "stuff", fill it full of fuel and the amount of fresh water you plan on carrying, then weigh it and set your weights accordingly.
Thanks. Thats why I said I needed to weigh again. I figured it would be understood that I would recalculate after the new weight.

We have just probably packed a few more things since the last weight.
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Old 07-11-2014, 11:27 PM   #9
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4 corner weight is the sensible way to go.
Of course it is.
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