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Old 03-09-2016, 08:20 AM   #1
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Tire pressure on georgetown with 22.5 tires.

I'm confused. What pressure should be used on 22.5 tires?
I'm about to leave on a long trip .
Thanks
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Old 03-09-2016, 08:27 AM   #2
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Here's the link for Michelin tires (look at the XRV table). Depends on the weight you're carrying.
http://www.michelinrvtires.com/refer...tion-tables/#/
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Old 03-09-2016, 08:46 AM   #3
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Unlike TT that get the best tire life by keeping the tires close to max pressure, Class A motor homes use a weight chart and adjust tire pis according to the gross weight that day of the Coach (some folks adjust pis for ride, I never did that)
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Old 03-09-2016, 09:44 AM   #4
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Max pressure is over 100, as a rule of thumb I have always kept mine at 90 cold. When the tires heat up they can go as high as 106. It is always best to fill them cold at less than max pressure or they will be way over when they get hot.
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Old 03-09-2016, 09:44 AM   #5
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Here's a link posted by another member for their 364tsf: 2016 Georgetown 364TSF CAT scale results

Here's the text:
2016 Georgetown 364TSF CAT scale results
Hello fellow owners,

I took possession of my 2016 364TSF last Friday. When I got home I filled it with gas and headed to the CAT scales. it has all the options except for washer/dryer combo. Here are the results for those who are curious:

Straight from the dealer, full tank of gas, no driver;

Front Axle: 6,768 LBS
Rear Axle: 12,125 LBS
Total 18,894 LBS

Corner weights:

Left Front: 3,373 LBS
Front Right: 3,395 LBS
Rear Left: 5,974 LBS
Rear right: 6,151 LBS

GVWR 22,000 LBS
Curb weight 18,894 LBS

Cargo Capacity: 3,106 LBS

Based on this info, for the Michelin XRV 255/80R22.5 G
Front should be 70 PSI
Rear should be 70 PSI

(This is with only gas, no passengers, and nothing on the hitch).
I had mine weighed (weight slip isn't with me today) and with tow dolly, passengers, water, etc., my numbers came out to 75 PSI front and 85 PSI rear.
At 90 PSI mine was just way too "bouncy" and hard to handle--much better after I lowered the pressure.

I'm assuming that no one is running 70/70 however.
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Old 03-09-2016, 10:01 AM   #6
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...and one more thought, just for grins:

If you assume a 35/65 weight split on a totally loaded motorhome--maxed at 22,000 pounds:

Front axle: 7,700 pounds/3,850 per tire
Rear axle: 14,300 pounds/7,150 per dual tire (without hitch load)
Add 500 pounds of hitch weight (max listed)
Rear axle: 14,800 pounds/7,355 per dual tire

For the Michelin XRV 255/80R22.5 G tires the air pressure should be at least:
Front: 70 PSI (table lists 3,875 pounds/70 PSI)
Rear: 75 PSI (table lists 7,410 pounds/75 PSI)

Wonder why our sticker says 90 PSI all around...
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Old 03-09-2016, 12:15 PM   #7
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Quote:
Originally Posted by Gualter View Post
I'm confused. What pressure should be used on 22.5 tires?
I'm about to leave on a long trip .
Thanks

I have the same 378TS and I run them at 90 psi all around as per the sticker on the interior wall says behind the drivers seat.
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Old 03-09-2016, 12:18 PM   #8
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Great information but he has a 378 triple slide weighs more than a smaller Georgetown.
So you must compare apples to apples.
90 psi all around and I just replaced my tired at 42,000 miles because of age not wear.
Iggy


Quote:
Originally Posted by toolman_57 View Post
Here's a link posted by another member for their 364tsf: 2016 Georgetown 364TSF CAT scale results

Here's the text:
2016 Georgetown 364TSF CAT scale results
Hello fellow owners,

I took possession of my 2016 364TSF last Friday. When I got home I filled it with gas and headed to the CAT scales. it has all the options except for washer/dryer combo. Here are the results for those who are curious:

Straight from the dealer, full tank of gas, no driver;

Front Axle: 6,768 LBS
Rear Axle: 12,125 LBS
Total 18,894 LBS

Corner weights:

Left Front: 3,373 LBS
Front Right: 3,395 LBS
Rear Left: 5,974 LBS
Rear right: 6,151 LBS

GVWR 22,000 LBS
Curb weight 18,894 LBS

Cargo Capacity: 3,106 LBS

Based on this info, for the Michelin XRV 255/80R22.5 G
Front should be 70 PSI
Rear should be 70 PSI

(This is with only gas, no passengers, and nothing on the hitch).
I had mine weighed (weight slip isn't with me today) and with tow dolly, passengers, water, etc., my numbers came out to 75 PSI front and 85 PSI rear.
At 90 PSI mine was just way too "bouncy" and hard to handle--much better after I lowered the pressure.

I'm assuming that no one is running 70/70 however.
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Old 03-09-2016, 01:47 PM   #9
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I'm with Iggy, I run 90psi as per the tire chart in the rig. Haven't heard or read anything that you change pressure as you change the rig. Once its set up and loaded a few passengers +/- isn't going to make a difference, only towing and at that you are looking at what 500lbs or less of tongue weight.
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Old 03-09-2016, 03:42 PM   #10
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My sticker lists 100 psi and the tires say 110 psi max.

Just had first oil change at Ford ,they said to run 100 psi.
I have a 2016 378ts
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