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Old 08-29-2012, 10:54 AM   #11
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Originally Posted by awwall View Post
My Georgetown came with Goodyear G670 245/70R19.5 tires. My wall plate in the coach says to inflate to 82psi. I have not weighed the coach yet, but looking at the Goodyear inflation chart for these tires, 80psi is the absolute minimum.

Was curious as to what others are running for tire pressure? My 351ds is what I consider loaded average.

I will get around to weighing.
If it were me and the min is 80# and the max is 110#, I would run 100# +/- 5#. FR is concerned with the ride and could care less about the wear. Running close to max will get you max mileage and minimum wear and you will probably not even notice the difference in ride. Running close to max air will also give you the best stability driving.
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Old 08-29-2012, 11:13 AM   #12
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I run 90# min on my 19.5 tires,. In hot weather they will go up close to 100#.

Bill
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Old 08-29-2012, 11:34 AM   #13
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Originally Posted by mbtelguy View Post
Iggy
Just curious, your axles are rated for a total of 23000 lbs and yet your GVWR is only 22000 lbs. On my 378 the total axle ratings are equal to the GVWR.

Do you know why the GVWR total does not equal axle rating ?
Gary
I'm no expert but here is all my numbers for my 378TS
2012 Georgetown XL 378TS on 53 Chassis –
22,000 lb GVWR chassis
Bare chassis weight 6,792lbs
Wheelbase 242.3 “
15,208 lbs Max Payload
26,000 lb GCWR
Michelin XZE Tires 235/80R 22.5" max 110 psi
Single tire max 4,675lbs at 100 psi. (Mine are at 90 psi)
Dual tires max 4410 lbs at 110 psi. ( Mine are 90 psi)
Max front axle max weight 8,000lbs/2 = 4,000lbs max per tire
Max rear axle max weight 15,000lbs/4 = 3,750lbs max per tire
Max tow 4,000lbs

Lots of data that does into the proper tire psi.

You can see your chassis spec in the attached 2012 F53 Ford Document
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File Type: pdf 2012_FORD_F53_Specs.pdf (279.7 KB, 23 views)
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Old 08-29-2012, 12:13 PM   #14
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Iggy
Part of Note #2 seems to say that the total GVWR should equal the sum of the axle ratings. See below for quote from note

"Front and rear GAWRs will, in all cases, sum to a number equal to or greater than the GVWR for the particular vehicle.
Maximum loaded vehicle (including passengers, equipment and payload) cannot exceed the GVW rating or GAWR (front or rear)."

I wonder which is correct ?

Gary
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Old 08-29-2012, 02:19 PM   #15
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Originally Posted by mbtelguy View Post
Iggy
Part of Note #2 seems to say that the total GVWR should equal the sum of the axle ratings. See below for quote from note

"Front and rear GAWRs will, in all cases, sum to a number equal to or greater than the GVWR for the particular vehicle.
Maximum loaded vehicle (including passengers, equipment and payload) cannot exceed the GVW rating or GAWR (front or rear)."

I wonder which is correct ?

Gary
I have no idea. My head hurts.
Keep the tire pressures as it sasy and drive it is what I'm doing.
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Old 08-29-2012, 05:59 PM   #16
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When I had my 2012 378TS front end alignment done at a truck tire pro shop they said the wall information was wrong. You should go by what is on the tire. They put mine up to 100# each.
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Old 08-29-2012, 06:03 PM   #17
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When I had my 2012 378TS front end alignment done at a truck tire pro shop they said the wall information was wrong. You should go by what is on the tire. They put mine up to 100# each.
That has to ride harder as well as more road noise.
If he said it was wrong why didn't he take it up to 110 psi?
Where did he come up with that number by magic?
He has no idea the weight of the motorhome unless he weighs it.

How many miles have you driven at 100 psi?
What is the difference?
Is it more stable at the campgraound?
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Old 08-30-2012, 12:00 PM   #18
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Iggy, my head hurts also. I have been all over looking at tire pressure information and it does give you a headache. Great postings here and I appreciate the info.

Like I said earlier, my main concern is the fact that the placard in the coach says 82 when the tire manufacturer says 80 is min. I fail to understand why FR would want to run the tires at min pressure.

Maybe Dunnc is on to something with his statement.
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Old 08-30-2012, 05:35 PM   #19
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I think if you check here it will give you all the information you will need.

The Inflation Loading - Goodyear RV

On the right side it has a link to the Inflation Table
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