[David]

Art,

Google Michelin rv tire chart. It lists the 315.

[Art]

Page 8 of:

https://fifthwheelst.com/documents/MichelinLoadAndInflation.pdf

[Jerry]

I found it, Steer tires Michelin XZA 2 Energy 315/80R-22.5 I thought I was adding to much according to chart should be between 90 and 95 I keep 100 in them??

[Kim]

What about Toyo Tires My Drives are Toyo M144a 315/80R 22.5 weight 16,900 LBS, My tag’s Toyo M153 315/80R 22.5 tag 10,140 LBS

[Jon]

If you compare weight and pressure charts from multiple tire manufacturers you will see the pressures are identical or very close to identical.

I’m surprised Toyo doesn’t have charts.

[DON]

Art, Toyo has a chart also, use Google Search.

[Art]

I do have one and even the Michelin chart there are many different models of tires, my steer tires I had to buy Michelin’s because during Covid ,Toyo was not building truck tires so I got Michelin XZA 2 energy tires, I have had good luck with Toyo tires. I thought at 100 psi on Michelin steer was way to much but according to chart it should be between 90 and 95 psi so 100 is not to bad, Going through AZ was some of the worst roads I’ve been on, Maybe 5 to 8 lb’s less would be a little better. George told me at the Prevost XPO the Michelin guy said to mush air is hard on tires the rough roads beat up the tires. George said is bus was 400 lbs heaver on driver side steer tires, Slides and Gen I’m sure, I have never weighted mine side to side.

[Art]

Art, That is where the inflation number comes from. It is based on your actual weight not how bumpy the roads are. Find a CAT scale and get your actual weights, as this is where your inflation research should start.

[Art]

I did If you look at this post farther back you will see it

[Mike, 92 Country Coach]

Great! what is the issue you are having?

[darrell]

You really need a 6 point weighing to get the accurate information you need. As mentioned, the left and right weights can vary by several hundred pounds and you must use the heaviest of the left and right weights to determine the correct inflation pressures for that axle as they both must be the same.