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Old 07-11-2014, 04:08 PM   #11
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Also,
I heard from a tire expert who frequents some of the RV sites and he said that the tires on the same axle should have the same pressure. Even if one corner is heaver than the other, both tires should be pressurized the same.
Tom
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Old 07-11-2014, 06:38 PM   #12
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hey guys check this out on CAT scale weighing your rigs
How To Weigh | CAT Scale
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Old 07-11-2014, 07:01 PM   #13
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I have my actual weights from the Cat scales.
Here they are:
Steer Axle 10,080
Drive Axle 17,720
Gross Weight 27,800
http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

How would I calculate my tire pressure?
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Old 07-11-2014, 07:04 PM   #14
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Quote:
Originally Posted by tmmar View Post
Also,
I heard from a tire expert who frequents some of the RV sites and he said that the tires on the same axle should have the same pressure. Even if one corner is heaver than the other, both tires should be pressurized the same.
Tom
Absolutely.
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Old 07-11-2014, 09:43 PM   #15
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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
http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf
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Old 07-11-2014, 10:50 PM   #16
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Quote:
Originally Posted by dan-nickie View Post
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
http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf
Based on those you'd be good at a min of 85psi. Without weighing each corner you could bump the fronts 5psi to account for any left to right variance and another 5 for buffer.

Looks like the backs you could run at 90 to 95 and account for some left to right weight mismatch and still have some buffer.


I hope to get a 4 corner weight after I get the fam in this one...will definitely hit the scale to get a front & rear. Hopefully we won't have to have a flea market behind Flying J.

Per our discussion this morning, I tweaked my rears to about 101psi this morning and fronts to 109. My inner rear tires were about six pounds high; getting the 4 rears even made a noticeable difference.
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Old 07-12-2014, 10:09 AM   #17
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For these situations i made my multilingual motorhome tirepressure calculator, in wich I take a reserve to the given load or different when only GAWR's given .
Also I use a saver formula then the american tire makers use to make those pressure loadcapacity lists , and even a bit saver then the European lists.
It takes care that the deflection of the tire stays the same as when maximum load and AT-pressure on tire, wich is the goal of all calculations.

so if you weighed give the seperate wheel(pair) weights and I will calculate and give a picture of my filled in spreadsheet.

will make one in next post for your GAWR's, but first have to google your tires for the maximum load and AT-pressure.

If you want to play with the spreadsheet yourselfes,here the link to the map.
First download it to your computer by rightclicking and choosing Download .
After download and eventual virus check , open in Excel programme on your computer, but Open office Calc can handle it too.

https://onedrive.live.com/?cid=A526E...E092E6DC%21793
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Old 07-12-2014, 12:17 PM   #18
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Originally Posted by jadatis View Post
For these situations i made my multilingual motorhome tirepressure calculator, in wich I take a reserve to the given load or different when only GAWR's given .
Also I use a saver formula then the american tire makers use to make those pressure loadcapacity lists , and even a bit saver then the European lists.
It takes care that the deflection of the tire stays the same as when maximum load and AT-pressure on tire, wich is the goal of all calculations.

so if you weighed give the seperate wheel(pair) weights and I will calculate and give a picture of my filled in spreadsheet.

will make one in next post for your GAWR's, but first have to google your tires for the maximum load and AT-pressure.

If you want to play with the spreadsheet yourselfes,here the link to the map.
First download it to your computer by rightclicking and choosing Download .
After download and eventual virus check , open in Excel programme on your computer, but Open office Calc can handle it too.

https://onedrive.live.com/?cid=A526E...E092E6DC%21793
Thanks for posting this. I saw your spreadsheet in another forum; that's a lot of labor.

Dan, I ran two with his spreadsheet. One is the "Part 1" based on the specs for our rigs, the second uses "part 2" using your axle weights. For your rig, the main difference i see in my allowances vs. his are he used 10% variance left to right using the actuals and also has an extra bump for ride control/comfort.

here are pdf's of the results:

Dan1
Dan2


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Old 07-12-2014, 01:06 PM   #19
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No math to it. Read the sidewall on the tire and air it to the posted max psi cold and you're good to go. I run these same tires on a F550 mechanics truck.
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Old 07-12-2014, 02:10 PM   #20
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Quote:
Originally Posted by Gottawonder View Post
Thanks for posting this. I saw your spreadsheet in another forum; that's a lot of labor.

Dan, I ran two with his spreadsheet. One is the "Part 1" based on the specs for our rigs, the second uses "part 2" using your axle weights. For your rig, the main difference i see in my allowances vs. his are he used 10% variance left to right using the actuals and also has an extra bump for ride control/comfort.

here are pdf's of the results:

Dan1
Dan2


Gottawonder

Pretty fancy spreadsheet.
And it's the first time I have see actual PSI instead of 5 lb increments.
Thanks.
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