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Old 08-11-2022, 09:35 PM   #1
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Tire Pressure Based on my RV weight

I know there are lots of threads about this, but I'd still appreciate if someone could double check my understanding - it seems like the tire pressure I could/should(?) use is much lower than the sticker on my motorhome.

I've got a 24 foot motorhome with no slideouts; it's a 2011 on an E350 chassis. Current tires are LT225/75R16 Michelin Agilis CrossClimate. I don't know what it came with originally.

The stickers on the vehicle show the recommended pressures:
Front - 75 PSI
Rear – 65 PSI

and weight rating:
GVWR – 12,500
GAWR Front – 4,600
Rear – 8,500

If I look at the Michelin pressure chart for that tire:
https://www.michelinrvtires.com/refe...tion-tables/#/
I think it shows that at those pressures the front could support 2,950 pounds on each side (~6,000 total) and the rear dualies could support 5,070 on each side (~10,000 total). Looking at that, it seems like those pressures are pretty high, maybe the tires that came on it originally used very different pressures?

I weighed the RV today with the gas, fresh water, and propane tanks full, some stuff in the cargo area, myself, and that's about it. On a trip I'll have a wife, two dogs, a 10 lb cat, and our stuff...
It weighed:
Front - 3,660
Rear - 6,780

I can't imagine the extra weight for a trip would come close to 1,000 pounds, but I'll use that as a number(?) and call it 40% front and 60% rear?
4,060 in front
7,380 in rear

Then maybe guess that the side might be uneven, as much as 53/47 (?) so the max weight on a side would be:
2,152 on one side in front = 50-55 psi
3,911 on one side in rear = 45-50 psi

Looking up those weights in the inflation chart gives:
Front - 50-55 psi
Rear - 45-50 psi

But I want to make sure that when it's colder than when I fill up the tires, I don't drop below that pressure. So maybe add 10% (?)
Front - 55-60 psi
Rear - 50-55 psi

Those numbers are still pretty far below what's on the sticker. Am I missing something?
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Old 08-11-2022, 09:49 PM   #2
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Like your rig, our rig is 23'-8" with no slide-out and Michelin Agilis Cross Climate tires.

Just as you say, based on the actual weight chart from Michelin, the tire pressure specified per the actual weight, is a lot less than the sticker on the motorhome states.

I follow Michelin's chart, not the sticker on the motorhome. BUT I do add 3 extra PSI all around for a little extra margin to compensate for "extra" cold tire pressure and high altitude changes, both common in mountainous areas. This way I have no worries, regardless of where we find ourselves.

Too much tire pressure messes with handling and introduces a rougher ride. The house shakes enough already. Why make it worse?

I weigh our rig during a trip with full fuel, full propane, full fresh water, and no waste water. Included are two adults and everything we bring along. I find it interesting that there is minimal difference on weigh-ins from one trip to another. We are pretty consistent on what we carry.
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Old 08-11-2022, 09:56 PM   #3
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Follow the tire chart and your actual weights and not the sticker. You do not need the maximum tire pressure unless your motorhome is at maximum weight.
Thanks,
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Old 08-12-2022, 05:00 AM   #4
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But I want to make sure that when it's colder than when I fill up the tires, I don't drop below that pressure. So maybe add 10% (?)
Front - 55-60 psi
Rear - 50-55 psi


Flip the pressures IMO

I have a 29ft.12400 GVW.
I just stopped for fuel and did a weight.. well twice, One with trailer one without.. I had time to kill, meeting someone and I am early..530am.. I have not weighed it since redoing the floor (laminate), adding solar and a few tid bits..

With trailer, just me, and 97% of what I car, short wife and 3 dogs..
4192 frt
7940 rear
Total 16192

Dropped trailer.
4198 frt
7564 rear
11762

4430ish trailer

SO after all that I have my PSI in older michelins,
75 rear 65 frt
RIDERS very very well
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