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Old 03-30-2019, 02:30 PM   #1
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Tire Pressures

New to this Motorhome thing, so bear with me.
Bought a used 40' Fleetwood.
GVWR: 31,000
Front GAWR 12,000
Rear GAWR 19,000
Placard behind drivers seat calls for 115 psi in the front and 95 psi in the rear.
Have not been able to get a four corner weigh done yet. However, got a Steer Axle weight of 9,240 and a Drive axle weight of 16,720.
Previous owner put on "Michelin X Multi Energy Z" 275/80R22.5 tires. As far as I can tell, these are top of the line/super heavy duty 18 wheeler truck tires.
The Michelin chart says at 115 psi in the front I'm good up to 13,940 lbs single!!
At 95 psi in the rear I'm good up tp 22,700 lbs dual!!
Michelin chart does not go low enough for my weights. What to do?
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Old 03-30-2019, 02:37 PM   #2
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Never go below the lowest pressure on the tire charts.
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Old 03-30-2019, 02:49 PM   #3
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It doesnít show anything for 5000 lbs. single? I run Michelinís with an H load rating and front axel is at just over 12,000. With that said, they definitely show PSI for 5,000 lbs. single on the chart.

You could always send Michelin an email...
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Old 03-30-2019, 03:02 PM   #4
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tire pressure

the lowest the chart goes for that tire is 75 psi and 10,140 lbs single
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Old 03-30-2019, 03:07 PM   #5
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Quote:
Originally Posted by Ericanderson View Post
the lowest the chart goes for that tire is 75 psi and 10,140 lbs single
The manufacturer of my chassis (Spartan) recommends a minimum inflation of 85psi.

Take care,
Stu
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Old 03-30-2019, 03:54 PM   #6
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You fly for AA?
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Old 03-30-2019, 04:28 PM   #7
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10,140 for each tire? My 11R22.5 top out much lower than that.
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Old 03-30-2019, 05:46 PM   #8
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I was told the Michelin charts are per axle, not per tire.
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Old 03-30-2019, 06:03 PM   #9
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From what i can tell, your numbers look correct. I would probably go 85 all around.
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Old 03-30-2019, 11:37 PM   #10
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Quote:
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I was told the Michelin charts are per axle, not per tire.
They're per tire. One you get a 4 corner weigh, you'll set the PSI for both tires on an axle based on the heaviest side (left or right) on that axle.
As an example, on my coach the front axle weight is 11,850 pounds with the right at 5600 and left at 6250, so I set the PSI for both tires (305/70 R22.5") based on the Michelin chart for 6250 pounds which is 95 psi.
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Old 03-31-2019, 12:21 AM   #11
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Remember, air pressure charts show the minimum for the corresponding weight.
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Old 03-31-2019, 01:45 AM   #12
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Michelin states that the PSI's in their charts are their "recommended" pressures for a given weight range as opposed to minimum pressures.
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Old 03-31-2019, 06:22 AM   #13
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To determine what the right tire pressure is for you, you need to weigh your MH. Load your MH as you would for travel, fill you gas and water tanks and then get your MH weighed.

If you can't do 4 corner weighing (which would be best), this is the procedure to follow:

1. Weigh the coach axles
2. Add 5% to account for possible uneven weight side to side.
3. Divide by the number of tires on each axle.
4. Look to tire chart for your brand and size to find tire pressure.
5. Add 5 psi for safety
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Old 03-31-2019, 11:03 AM   #14
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I seem to be the only one who does not care how much my coach weighs. Unless you are going to bring your vast bowling ball collection with you on vacation here is what I have been doing since the early eighties.

Since the tires are not the ones that came with the coach fill the tires to just under the max air pressure indicated on the tire itself.

Watch the tread wear closely and if you see signs of under or over inflation, adjust the pressure accordingly never going over the max psi on the tire.

If the ride is too harsh, let some air out until you are happy with the ride.

Keep watching the tread and enjoy your vacation.

JMHO Michelin tires are top of the price point but not any better than average.

If the tires are not over inflated and you are not seeing any concerning tread wear, then you will be fine.

If you are talking about a pull trailer or fifth wheel then you need to follow the rules and watch your weight more closely. IMHO
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