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Open Roads Forum  >  Class A Motorhomes

 > Tire preasure MAX ???

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jolooote

Miami, FL

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Posted: 08/09/12 03:07pm Link  |  Print  |  Notify Moderator

2006 National RV Class'A'. New, Goodyear, G647, 245/70R-19.5,
Load Range 'G' tires on Ford F53 20500# chassis.
The MAX preasure on side of tires is 110 psi. Is it ok to just run em at that preasure? No, I'm not goin 2 get it weighed. No, I'm not going to mess with manufacturers Tire preasure tables.
I'll be traveling across the US to Colorado & there will probably be temps into the 100s in Kansas, etc. The preasures listed inside the coach by the builder (85) seem very low. I don't want the tires to be overheated if preasure is too low.


Joe&Charlotte, Nat'l SurfSide DE34D Ford 362HP 5speed


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If its got Tires or Boobs...U'r GONNA have trouble with it!


jauguston

Bellingham, WA

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Posted: 08/09/12 03:11pm Link  |  Print  |  Notify Moderator

Sounds like you are smarter than the coach builder-why even post?

Jim


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the bear II

Torrance CA.

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Posted: 08/09/12 03:24pm Link  |  Print  |  Notify Moderator

Always go by the pressures listed on the tires or the tire manufacturer website.

WellShooter2

West Texas

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Posted: 08/09/12 03:30pm Link  |  Print  |  Notify Moderator

jauguston wrote:

Sounds like you are smarter than the coach builder-why even post?

Jim


Because the tire builder knows more about tires than the coach builder.

Get one of those IR temperature guns. They are pretty cheap. Play around with it until you understand it. Air your tires up to 80-90% of the recommended tire pressure on the sidewall. Do it early in the morning when it is cool. Run 200 miles or so of your trip nad then use the thermal gun to check tire temperatures. Temps will be higher on the sunny side of the coach. Anything near or over 150 degrees is probably a little on the toasty side, let them cool down. Anything 140 or less you are good.

It's not pressure that kills the tire it's heat. Run whatever pressure you want, Just keep the temp below 150 and the tire should be fine.


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topflite51

In The Desert of Nevada

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Posted: 08/09/12 03:39pm Link  |  Print  |  Notify Moderator

I believe that you will find that that is the minimum pressure for the maximum load of the tire that is listed on the side of the tire.

You will be safe running that pressure instead of running the lower pressure recommended by the coach manufacturer. The coach manufacturer's are not the experts in regards to tires,they are hardly expert on the coaches that they make.


David
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W4MBG

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Posted: 08/09/12 03:56pm Link  |  Print  |  Notify Moderator

you might end up with a harsh, twitchy ride by blindly going with the max pressure listed on the tire. also, what is the max pressure for the wheels?


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huffmeister

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Posted: 08/09/12 04:13pm Link  |  Print  |  Notify Moderator

jolooote wrote:

2006 National RV Class'A'. New, Goodyear, G647, 245/70R-19.5,
Load Range 'G' tires on Ford F53 20500# chassis.
The MAX preasure on side of tires is 110 psi. Is it ok to just run em at that preasure? No, I'm not goin 2 get it weighed. No, I'm not going to mess with manufacturers Tire preasure tables.
I'll be traveling across the US to Colorado & there will probably be temps into the 100s in Kansas, etc. The preasures listed inside the coach by the builder (85) seem very low. I don't want the tires to be overheated if preasure is too low.


Why ask a question if you already know all the answers? I bow to your superior intellect and will watch for the accident report you surely will generate.

peaches&cream

Northwest Georgia

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Posted: 08/09/12 04:25pm Link  |  Print  |  Notify Moderator

I think you should do whatever makes you happy. If your happy, I'm happy.





kaydeejay

SE Michigan, USA

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Posted: 08/09/12 04:35pm Link  |  Print  |  Notify Moderator

jolooote wrote:

2006 National RV Class'A'. New, Goodyear, G647, 245/70R-19.5,
Load Range 'G' tires on Ford F53 20500# chassis.
The MAX preasure on side of tires is 110 psi. Is it ok to just run em at that preasure? No, I'm not goin 2 get it weighed. No, I'm not going to mess with manufacturers Tire preasure tables.
I'll be traveling across the US to Colorado & there will probably be temps into the 100s in Kansas, etc. The preasures listed inside the coach by the builder (85) seem very low. I don't want the tires to be overheated if preasure is too low.
What does the tire pressure label in the coach say? Is that the 85psi you quoted? Then that is the pressure you need to run at GVWR (no tire tables to look for!). Why do you think that's low? My prior Class A had 110max psi tires that ran just fine at 90psi. Just because it says "MAX" on the sidewall does not mean you HAVE to run at that. It's only required when the tires are carrying their max load.
Running significantly higher than the 85psi will make your ride harsher and MAY cause the center of your tires to wear faster than the outer edges.
But it does seem like you think you know best, so just do it!
(Oh, and you might want to check the spelling of "pressure"!)


Keith J.
1999 Sunnybrook 27RKFS Fiver.
2005 GMC Sierra 2500HD CC/SB/DA 2WD, LLY with LBZ air cleaner, 52 gal Titan tank, Bilsteins, Line-X, Westin steps, Prodigy, Retrax cover, 16K Superglide, 5th-Airborne pin-box, Multi-vex mirrors, TST TPMS.


wildtoad

Blythewood, SC

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Posted: 08/09/12 04:43pm Link  |  Print  |  Notify Moderator

If you are not going to get it weighed, I would go with the tire pressure as stated in the coach. While National may not be tire experts I suspect the do know the GVWR, I do suspect they did read the tire chart from the tire manufacturer and I do suspect the 85 lbs matches the chart.

Running the max pressure as stated on the tire is fine as well.


Tom Wilds
Blythewood, SC
2000 Hurricane 30Q

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