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Open Roads Forum  >  Class A Motorhomes

 > Tire pressure questions

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jbobst

Arizona

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Posted: 03/03/12 08:58pm Link  |  Print  |  Notify Moderator

Sorry to post another tire thread. I have not weighed my motorhome, and the best answer to my question is most likely to have it weighed. However, I can't get it weighed right away, so my question is, what is a safe tire pressure to run for the time being until I can get the motorhome weighed? I have a 2008 32' National Sea Breeze motorhome on a Ford chassis (gas). The factory tires are still on the motorhome, and they are Goodyear G670 245/70R 19.5 size tires. I believe they are load range F, but I need to double check that.

Right now I have the air pressure set to between 86-88 pounds on each tire. However, I am worried that maybe that is too much air pressure. The other night, I found that one of my inside dually tires was completely flat. I put air into the tire and drove the motorhome back to the storage lot. It has been two days since then, and the tire is still holding air, so I am not sure why it went flat as it is holding air just fine now. I will be taking it to a tire facility on Monday to have them check out the tire, but I wanted to get opinions on what a safe air pressure would be for this motorhome.

Thanks

wolfe10

Texas

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Posted: 03/03/12 09:04pm Link  |  Print  |  Notify Moderator

ASSUMING (YA ASSUMING) that each axle is loaded to GAWR BUT NOT OVER, you will by law have a GWAR sticker in the coach.

It is usually near the driver's area. It will state (again, by law) the tire size and PSI if each axle is loaded to GAWR.

That will at least give you a good starting point. To be safe, you might go somewhere between that and the PSI on the sidewall of the tire for max load.


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Ka Ron

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Posted: 03/03/12 09:06pm Link  |  Print  |  Notify Moderator

What does the plaque on the motor home say for tire pressure??


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vtbig

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Posted: 03/03/12 09:56pm Link  |  Print  |  Notify Moderator

Forget about reading the plaque on your motorhome as the bible for air inflation. That tire pressure is not based on a loaded coach. Instead look at the Maximum Cold Pressure that is listed on the sidewall and don't inflate beyond that. Assuming your coach is not overloaded that pressure will do fine. Once you get the loaded coach weighed you will be able to decrease tire pressure for a more comfortable ride.

You can go to the Goodyear site and get your proper tire inflations once the coach is weighed.

How many miles did you drive the RV on one dually? Any distance in miles can permanently damage the inflated tire as you far exceeded the capacity of the tire while the other one was flat. Tires do not just deflate, so I would have that flat tire removed and thoroughly inspected including the valve stems...which should be metal and not rubber.

tahiti16

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Posted: 03/03/12 10:07pm Link  |  Print  |  Notify Moderator

NRV had a tendency to put tires on that had a good margin of carrying ability, so look up the axle weight ratings and then go to Goodyear site and find weight/pressure for your setup. This will still be a wag but gas coaches tend to be near if not over the GVWR/GAWR's. Then get it weighed as soon as possible so you get the ride, handling and wear that you should get from the tires.


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phillyg

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Posted: 03/04/12 06:55am Link  |  Print  |  Notify Moderator

wolfe10 wrote:

ASSUMING (YA ASSUMING) that each axle is loaded to GAWR BUT NOT OVER, you will by law have a GWAR sticker in the coach.

It is usually near the driver's area. It will state (again, by law) the tire size and PSI if each axle is loaded to GAWR.

That will at least give you a good starting point. To be safe, you might go somewhere between that and the PSI on the sidewall of the tire for max load.

X2


2002 Keystone Cougar 286, 8,400lbs loaded, pulled with a 2004 F150 Supercrew, 5.4, 3.73 gears. Retired and enjoying life

wolfe10

Texas

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Posted: 03/04/12 09:35am Link  |  Print  |  Notify Moderator

vtbigdog wrote:

Forget about reading the plaque on your motorhome as the bible for air inflation. That tire pressure is not based on a loaded coach. Instead look at the Maximum Cold Pressure that is listed on the sidewall and don't inflate beyond that. Assuming your coach is not overloaded that pressure will do fine.



By definition/law, the PSI on the GVWR plate is for each axle loaded to its GAWR.

The PSI on the GVWR plate will NEVER be higher than the Maximum cold PSI on the sidewall of the tire (unless "lesser" tires has been substituted for the OE tires).

Dick_B

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Posted: 03/04/12 09:50am Link  |  Print  |  Notify Moderator

and you really should weigh each side of the axle separately since one side may be loaded more than the other.
We take the easy approach and load up the tires to the cold pressure on the side of the tire and not worry if the pressure drops a few psi over time or with a drastic change in temperature.


Dick_B
2003 SunnyBrook 27FKS
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