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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: http://www.forestriverforums.com/for...ts-100442.html

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: http://www.forestriverforums.com/for...ts-100442.html

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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Old 03-09-2016, 04:05 PM   #11
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Quote:
Originally Posted by Gualter View Post
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

My sticker says 100 psi as well



2014 Georgetown XL 378
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Old 03-09-2016, 04:25 PM   #12
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Originally Posted by kgreen View Post
My sticker says 100 psi as well
2014 Georgetown XL 378
I bet you have tile floors. That is the extra weight.
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Old 03-09-2016, 04:28 PM   #13
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Quote:
Originally Posted by Gualter View Post
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
But what does the sticker in your Georgetown say?
That is calculated by the weight of your specific rig.
Who is "they said"? The guy who changes your oil?
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Old 03-09-2016, 05:12 PM   #14
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Quote:
Originally Posted by Iggy View Post
I bet you have tile floors. That is the extra weight.

Yes I do


2014 Georgetown XL 378
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Old 03-09-2016, 05:43 PM   #15
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Quote:
Originally Posted by Iggy View Post
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, 08:53 PM   #16
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Old 03-10-2016, 04:08 PM   #17
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Forget the American made pressure loadcapacity lists for LT and TR tires.
They are made with a formula that leads to lower loadcapacity's in the lower pressures then for instance the European calculation, wich is used of all kinds of radial tires for decades.
For Normal car tires ( P-tires) American TRA stepped over to the European ETRTO calculation as late as 2006, so that calculation is right now, but still many old lists are wondering around on the internet.
For LT and TR tires even a better formula should be used then the EUR calc.

I made my own pressure loadcapacity-lists wich are extra save . you can find it in PDF in this map on my one-drive.
https://onedrive.live.com/?id=A526E0...26E0EEE092E6DC

But I can also calculate it for you wiht my motorhome tirepressure calculator.
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Old 03-10-2016, 09:42 PM   #18
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Quote:
Originally Posted by jadatis View Post
Forget the American made pressure loadcapacity lists for LT and TR tires.
They are made with a formula that leads to lower loadcapacity's in the lower pressures then for instance the European calculation, wich is used of all kinds of radial tires for decades.
For Normal car tires ( P-tires) American TRA stepped over to the European ETRTO calculation as late as 2006, so that calculation is right now, but still many old lists are wondering around on the internet.
For LT and TR tires even a better formula should be used then the EUR calc.

I made my own pressure loadcapacity-lists wich are extra save . you can find it in PDF in this map on my one-drive.
https://onedrive.live.com/?id=A526E0...26E0EEE092E6DC
But I can also calculate it for you wiht my motorhome tirepressure calculator.
jadatis
Not sure what you are talking about but we are talking about Motorhome tires for 22,000 -24,000 lb chassis.
The tires we are talking about are 14 ply Load Range G which are close to Semi-Truck tires and are not trailer or car tires.
Each Motorhome in US has a sticker showing Max Gross weight of motorhome and have a specific max tire pressure for that load. Most of our rigs are not 100% fully loaded so the weight is less and we are just talking about true weight in relations to the specific tire manufacturers sheet for psi vs loads.
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Old 03-11-2016, 03:50 PM   #19
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answer to above.

what I mean is that you dont have to search for a pressure/loadcapacity list, yust open the link I gave and select the loadrange ( given to J with125 psi, so also the one you need) . Maximum load is only given in the Loadindex steps, so in America you sometimes have to round down, wich only gives higher pressures, so never wrong.

wise is also when weighed, to add 10% first and look that load back in the list.

then You have a extra save list and even higher pressure given then AT-pressure. But also goes pretty low in the pressure , lower then most official lists give.

Pick the USA map and even a total pdf is given with all the loadranges.

The SL and XL P tires I only mentioned to prove that also TRA concluded their old calculation was wrong, thoug they did not bring it that way.
The Eur calc for LT and TR was already better for decades, and still in USA the inadequate calculation is used.

Thats the reason why I advice to use my lists, give sertainly no lower pressure so always save.
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Old 03-11-2016, 05:50 PM   #20
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You can Google the 2016 Ford F53/F59 specifications and find the recommended inflation for the MAX GVWR with factory tires. For 19.5 tires they show 15k-20.5k at 82 psi, for 22k 95 psi, and for 22.5 tires, 22k at 90 psi, 24k at 100 psi. Obviously weighing the coach and using the corresponding pressure is a better solution.
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