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Old 07-16-2016, 03:37 PM   #1
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Tire Pressures

We took the rig to the scales and the entire coached loaded weighed 20,450. I added a few pounds for missing kids, dogs and stuff. But the receipt says the Steer Axle 7180, and the Drive Axle 12,580.,,,,19,760 gross weight. We have a 2016 Georgetown 364TS. The tires are Michelin 235/80.R22.5. XRV. I don't understand this chart in the photograph, can someone help please. Did we make a mistake weighing the total coach combined Axes? It's the middle chart. Help, I"m stupid.

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Old 07-16-2016, 03:52 PM   #2
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We took the rig to the scales and the entire coached loaded weighed 20,450. I added a few pounds for missing kids, dogs and stuff. But the receipt says the Steer Axle 7180, and the Drive Axle 12,580.,,,,19,760 gross weight. We have a 2016 Georgetown 364TS. The tires are Michelin 235/80.R22.5. I don't understand this chart in the photograph, can someone help please. Did we make a mistake weighing the total coach combined Axes? It's the middle chart. Help, I"m stupid.

Attachment 114264

Is it saying I should keep about 70 PSI? Because I checked and cold this morning and they were 89
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Old 07-16-2016, 04:14 PM   #3
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Is it saying I should keep about 70 PSI? Because I checked and cold this morning and they were 89
Tires should be inflated to the max cold pressure as stated on the sidewall.
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Old 07-16-2016, 10:18 PM   #4
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Originally Posted by kentdavido View Post
Is it saying I should keep about 70 PSI? Because I checked and cold this morning and they were 89
The dealer always fills to the manufactures (Ford) supplied label, just in case you load the motor home to it's maximum carrying capacity.

Here's a link to the chart.
Load & Inflation Tables | Michelin Truck

Looks like you should be running 75 lbs. in the front ((single)(7180 you 7290 table)) and 70lbs. rear ((dual) 12580 you 12640 table)).

You should notice an improvement in handling and ride with the lower pressures.
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Old 07-16-2016, 10:20 PM   #5
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Tires should be inflated to the max cold pressure as stated on the sidewall.
NO. NO. NO.
The max tire pressure on the side of the tire just tells you maximum tire pressure if you meet the maximum weights for the tire only.
If your rig front weight is 7200 lbs you divide by 2 and you get the front individual weight of each front tire is 3,600 lbs.

Now you go to the chart and see what weight is closest to that for front single tires and look at the PSI at the top of that column.
That is what the manufacturer recommends.

The rear axle weight is divided by 4 to get those tire weight o f the rig
and look for what manufacture recommends for those tire pressure.
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Old 07-16-2016, 10:28 PM   #6
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Iggy, is that information on the chart I shared in my note? Thank you for your insight. I'm trying to understand tire pressure and handling.
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Old 07-16-2016, 10:35 PM   #7
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Originally Posted by kentdavido View Post
We took the rig to the scales and the entire coached loaded weighed 20,450. I added a few pounds for missing kids, dogs and stuff. But the receipt says the Steer Axle 7180, and the Drive Axle 12,580.,,,,19,760 gross weight. We have a 2016 Georgetown 364TS. The tires are Michelin 235/80.R22.5. XRV. I don't understand this chart in the photograph, can someone help please. Did we make a mistake weighing the total coach combined Axes? It's the middle chart. Help, I"m stupid.

Attachment 114264
Here is what I see
Your front axle weighs 7180 lbs or approx. 3,600 lbs per tire
The chart shows about 80 psi per tire

Your rear is 12,580 lbs ob 4 tires.
if you divide by 2 each set of rt and left dually has approx. 6490 lbs and if you dive it by 2 you will find that each tire has approx. 3,250 on each.
Chart shows 75 psi for them
Knowing all the numbers I would have all the tires at 80 psi cold for your rig.
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Old 07-16-2016, 10:37 PM   #8
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Originally Posted by kentdavido View Post
Iggy, is that information on the chart I shared in my note? Thank you for your insight. I'm trying to understand tire pressure and handling.
See my reply about your rig weight above.
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Old 07-16-2016, 10:41 PM   #9
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It looks like the chart from Michelin (3rd down from the top - below) that the fronts should be 75 to 80 PSI, and the rear 70 to 75 PSI. Does that sound correct.

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Old 07-16-2016, 10:49 PM   #10
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Tire pressure

Iggy and Everyone, thank you and I can sleep tonight. You guys are the BEST.
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