Pls check the Dealer and My tire pressure choices

[f365gt4]

I tried to figure what the pressures should be some time ago and would like to verify if I made the correct choice. The other day a dealer told me to just use the settings from the driver seat manufacturer's tag (pictured). This is a 2003 Dynasty with 295/80R 22.5 tires. My document with larger images wouldn't load, so it looks like the chart jpg info isn't legible.
Using a load and inflation table I ended with the following.
Steer wheel 115 psi, Drive 100 psi, Tag 90 psi, with safety factor.
I've seen where others had much lower steering pressures but I didn't have the knowledge to disregard the manufacturer's recommendation. Thanks for any comments.

Sorry Ted, just took me too long to get it all down tks

[Mr Ted]

With out knowing what each axle weighs there is no way to give you an honest answer. Assuming those pressures are for "Dry" weight you might want to up the pressures about 10 lbs " as long as that's not over the tires maximum" until you have it weighed

[f365gt4]

#1 Dynasty specs
#2 Scale weights
#3,4 My attempt to apply scale weights to the chart.


images get a little larger if clicked on.

[96 Wideglide]

Looking at your scale weights, you don't have enough load on your tag axle.

You probably need another 5 to 10psi added to your tag axle air bags.

[vito.a]

I agree. Your tag is not loaded enough. But, it's a balancing act. As you load the tag it also shifts weight onto the front axle.

[f365gt4]

Thanks, that's what I'm looking for, I never considered tag airbag adjustment.
Is the steer pressure still ok at 115, Max cold pressure on tires is 125 psi

[96 Wideglide]

Yes.

The 115psi in your steer tires will be good right up to the axle max of 14,600 lbs.

Make small adjustments on your tag axle regulator. They are quite touchy to adjust.

[f365gt4]

OK, will do

[moisheh]

After individual wheel weights I was running 110 100 90. When I had an alignment in Oregon they suggested 115 on the FA. I would disagree with others on the tag pressures. Of you add 10 lbs. Pressure to the tag you run the risk of overloading the FA. I will have to go outside and check the Dynasty manual re adjusting the tag.

[96 Wideglide]

He's only got 12,140 lbs on the steer. He has plenty of room!

His drive axle is overloaded. He has to get some weight on his tag axle!!

[JohnLoves2Sk]

Remember that the inflation tables give you the MINIMUM pressure for that load, measured cold.
To learn way more about tires than you thought you could, checkout:
https://www.rvtiresafety.net/

The author is also frequently on this forum, as TireMan9.

[f365gt4]

I'm listening, Those scale results were with a full fresh water tank. I don't boondock so I'm only going to keep the fresh water half full. That might make a difference in the drive weight. If you think it's a good move, I'll raise the tag air bag by 5lbs. I had 12 blown tires on my car trailer while using my dodge pickup (trailer 960K). Wrong tires and axel, upgraded to a commercial size with steel belts and ditched the air. Solved my problem, so I'm a little sensitive to tire maintaince.

[96 Wideglide]

Get your weight with a full water tank, and as close to a full fuel tank as possible.

I think your gona need 10 more psi on your tag axle bags, if not more!

As an example... I have about 14,300 lbs on the steer axle, 17,500 lbs on the drive axle, and 7,000 lbs on the tag axle.

My axles are rated the same as yours, tires the same as well.

Your going to be in for a pleasant surprise how nice your coach will track when you get some of that weight onto your tag axle! It's doing practically nothing for you right now.

[RamiDav]

Originally Posted by f365gt4

(trailer 960K).

What does ( trailer 960K ) mean?