Class A tire Air pressure

[frankiebIII]

Trying to see what most people ride on. I'm in Northern California and the temp has been around 55-65 degrees. I just brought Motorhome out of storage and checked the cold tire pressure Tires are Brand new Samsons 275/70R 22.5 rated to be inflated to 120 cold
Right now all 6 are between 105 and 109 cold. The ride seems ok.

Heading South 4 hours to Santa Barbara on Sunday.

Is this ok?
How much pressure do they gain on a 4 hr trip in temps no hotter than 70 degrees (I know, hard to tell)?
What do most people inflate their tires to when traveling?

Thanks for the help!

[mike_brez]

frankiebIII wrote:
Thanks again to all.
Where do I find the tire pressure chart? Online maybe?

You won't find one anywhere for the Samson tires.

[AstroRig57]

I recently put Yokohama RY023 tires on our Class-A, and found this handy little gem on the Yokohama website,

Inflation Pressure Calculator

[Snomas]

Mine read low 90's when cold and run at about 110 when hot by my TPMS readings. By my air gauge I set the front @ 105 max and rears @ 100. I have never weighed the corners and have not had a problem w/ 3rd set of Michelins in 14 years.

[bluwtr49]

Based on my axle wts. and 12R 22.5 tire load capacity I run 95 front, 90 drive, and 70 tag cold.

[jplante4]

I had the same issue about not getting to a CAT scale right away. I ran my Yokos at max sidewall (120) until I got weighed. Running 95 now according to the manufacturer's chart. Don't use the one on the wall in the coach because that only applies to the tires that they put on at the factory.

Max sidewall will run hard as a rock but you won't have to worry about being under. The difference in ride between 120 and 95 was certainly noticeable.

[J-Rooster]

I run 100 lbs. all around

[Alan_Hepburn]

Leale's RV Service in San Jose will give you a 4-corner weight for free if you ask when you have any work done by them.

[gatorcq]

best and safest ride...weight the 4 corners and adjust accordingly.

[stillthinking99]

There is a chevron station in Santa Maria, Ca. Just off Betteravia Rd. at the 101. They have easy access for truck and motor home fueling and they have a scale. I asked the crew running the scale to help me weigh my m.h. (they weigh axles only) and they seemed happy to help. They even told me what my toad weighed.

I know my reply is a bit late, maybe you can try them on the return trip.

[Sooner_Schooner]

110 all the way around and mine works just fine.

[murraymcleod]

I'm also in the SF Bay area and found public weighing stations in Oakland and in Sonoma, and that was about it! Check online for public scales. I had my two axles weighed at the Sonoma location for about $35 while we were headed up to Sugarloaf Ridge State Park last Spring.

[fyrflie]

You can search out truck scales in your area.
Think outside the box.
Maybe a local moving company or the port of Oakland.
Be aware that most scales will charge you and most are not setup to weigh each corner but it depends on how busy they may be at the time.
The actual weight per corner is good for rearranging your goods to equal out the weight in your coach. The weight per axle is an indicator of how your coach is carrying the load.
All tires on each axle should be inflated to the same pressure. I.E. You wouldn't want to inflate the left front to 65 and the right front to 85 just because of the corner weights you may have gotten. This could cause a driveability issue. Read " pull to one side".

[frankiebIII]

Thanks again to all.
Where do I find the tire pressure chart? Online maybe?

[down_home]

We run our tire pressure according to the label behind the drivers seat. We tried maximum pressure on the tire and in between. it near beat us to death and loosened things up.
Now different tires than factory installed, like Michelins replacing GY670s might need a bit more pressure since they have more flexible sidewalls.
We watch tire temps, with heat gun. I'm not sure what the pressures are now. Where we store adjsuts them according to a table. Most of our coaches do not weigh anywhere near what a semi does and except for the Goodyear and Michelin they all are more or less semi tires and rock hard at max pressures.
Follow the coach manufacturer's label even if you add a thousand pounds of cargo. tires get warmish add five lbs.