Good Sam Club Open Roads Forum: Class A Motorhomes: Tire pressures
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 > Tire pressures

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phillyg

SWFL

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Joined: 04/24/2002

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Posted: 07/10/22 11:13am Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

First thing I would question is running max tire pressure on MH.
I would weigh the rig, get the tire inflation chart from tire manufacturer, inflate to around five pounds more than shown on chart.
I would lay odds that pressure would be lower than max pressure on sidewall.
I would not adjust tire pressure once proper inflation is achieved.


This is the best advice.


--2005 Ford F350 Lariat Crewcab 6.0, 4x4, 3.73 rear
--2016 Montana 3711FL, 40'
--2014 Wildcat 327CK, 38' SOLD

Sandia Man

Rio Rancho, NM

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Posted: 07/18/22 11:01am Link  |  Quote  |  Print  |  Notify Moderator

I certainly understand your concern, I recently paid nearly $4K for a set of six 22.5" tires for our motorhome, a lot of dough for rubber for sure. All the answers above are great advice, simply set your tire pressures when tires are cold, cold does not indicate a certain temp, just means when tires have not been used, best to do in the morning as tires have been resting/cooling down overnight. Set them at your desired pressure in the morning, we use 90psi for our motorhome tires, and don't worry about increase in psi while going down the road, perfectly normal as tire manufacturer engineers have already accounted for this. Even when not moving down the road our TPMS indicates psi increases, although minor, when the sun is beaming down on the side of the coach where tires are exposed. That all being said, you spent the money for them and if you prefer to do it the way you have in the past, you were happy with the results and that's all that counts.

lfeather

Titusville, FL

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Posted: 07/26/22 01:19am Link  |  Quote  |  Print  |  Notify Moderator

RB414921 wrote:

When traveling with your RV your maximum tire pressures are 110 when it reaches 110 is the general rule of thumb to stop and lower the pressure back to the starting point of 90 to 95 psi? I just bought a brand new set of coopers for my motorhome and this is what I’ve been doing with tires before and just making sure that I am doing the right thing.


The "maximum tire pressure" requirment is for a cold tire.


Larry, Debbie & Max the Pug
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wolfe10

Texas

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Posted: 07/29/22 12:33pm Link  |  Quote  |  Print  |  Notify Moderator

lfeather wrote:


The "maximum tire pressure" requirement is for a cold tire.


CLOSER, (and accurate) BUT:

What the script on the sidewall actually means is the MINIMUM/needed PSI for the rated weight carrying capacity.

Again, we have NO IDEA if your actual axle weights are at, above or below your tire's carrying capacity.

Only with the actual weights can you accurately set tire pressure. Said another way, you hope your actual axle weights are well less than tire capacity. That means they have a safety margin/not always loaded to 100% of capacity AND that you can safely carry lower pressure for a better ride.


Brett Wolfe
Ex: 2003 Alpine 38'FDDS
Ex: 1997 Safari 35'
Ex: 1993 Foretravel U240

Diesel RV Club:http://www.dieselrvclub.org/

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