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Old 09-02-2012, 03:57 PM   #1
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tire pressure

i have a class A with tag axle-tire pressure about 112psi when cold-reccommended to be 120psi when cold...tried air pump at gas station but doesn't even move the needle-either my air gauge is broken or i need to be using a commercial air pump-help if you can
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Old 09-02-2012, 04:05 PM   #2
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First question is, where did you get the 120psi recommendation? Weight/load chart or the side of the tire?

The air compressors at the local gas stations likely only go to 60-90psi. I know I could only get mine on my truck to 80psi one time and another could only do 60psi.. You need to either buy one for your coach that can do 150psi, or hit a truck stop for air.
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Old 09-02-2012, 04:19 PM   #3
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I agree with Midnite, re-check the 120 PSI reccomendation.
The max rating on mine are 120 PSI so I run 100 in the rear duals and 110 on the front. When I check them hot after comming off the highway I have 115-118 on the rear and the same on the front.
120 Cold sounds like they could be over inflated when the are hot.
Just Sayin,,,
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Old 09-02-2012, 04:38 PM   #4
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To get the proper tire pressure, you need to weigh the MH, loaded just like you would be pulling out on a trip. This is best done one corner(wheel) at a time, as it will vary left to right. At least weigh front and rear separate.(in your case by axle) Then look up your tires by manuf. and you'll get the proper pressure at that weight.
When I had tires put on our MH, (our first) the tire shop said run the pressure on the side of the tire... WRONG !!! That's the Max pressure, you'll find it will ride better, drive better, etc when you get the proper pressure for you tires/weight.
No expert here, just an old trucker/hot rodder/ now rv'r / trucker... Darel
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Old 09-02-2012, 04:45 PM   #5
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To get the proper tire pressure, you need to weigh the MH, loaded just like you would be pulling out on a trip. This is best done one corner(wheel) at a time, as it will vary left to right. At least weigh front and rear separate.(in your case by axle) Then look up your tires by manuf. and you'll get the proper pressure at that weight.
When I had tires put on our MH, (our first) the tire shop said run the pressure on the side of the tire... WRONG !!! That's the Max pressure, you'll find it will ride better, drive better, etc when you get the proper pressure for you tires/weight.
No expert here, just an old trucker/hot rodder/ now rv'r / trucker... Darel
Well said Monkey, That is how I arrived at my tire pressurees and it made all the difference in ride and handling. No to mention proper wear on the tires.
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Old 09-02-2012, 04:48 PM   #6
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Quote:
Originally Posted by dennis45 View Post
I agree with Midnite, re-check the 120 PSI reccomendation.
The max rating on mine are 120 PSI so I run 100 in the rear duals and 110 on the front. When I check them hot after comming off the highway I have 115-118 on the rear and the same on the front.
120 Cold sounds like they could be over inflated when the are hot.
Just Sayin,,,
The MAX PSI on the tire is MAX PSI COLD. It can go over that while hot...
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Old 09-02-2012, 04:51 PM   #7
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Well said Monkey, That is how I arrived at my tire pressurees and it made all the difference in ride and handling. No to mention proper wear on the tires.
10-4 Dennis... It made a "noticeable" difference in handling in our older P32 chassis. Our first trip out to AZ, wore me out... Our second trip there this year was much better after I lowered the pressures front and rear...
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Old 09-02-2012, 07:19 PM   #8
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Quote:
Originally Posted by Midniteoyl View Post
First question is, where did you get the 120psi recommendation? Weight/load chart or the side of the tire?

The air compressors at the local gas stations likely only go to 60-90psi. I know I could only get mine on my truck to 80psi one time and another could only do 60psi.. You need to either buy one for your coach that can do 150psi, or hit a truck stop for air.
The air pumps at your local gas stations are there for cars. They don't have the capacity for these 22.5 tires. Midniteoyl gives the only two viable options.
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Old 09-03-2012, 09:52 AM   #9
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can you tell i am new to this
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Old 09-03-2012, 11:05 AM   #10
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can you tell i am new to this
Not a problem brother.. We ALL were 'new' at one time


Do you know your RV's axle weights? If not, you can hit up a CAT scale in your area and have it weighed, front, back, total. Then, with that info and what size and brand of tires you have, we can help you get to the correct air pressures you should be running.
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Old 09-03-2012, 02:23 PM   #11
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We are also new - and am just learning about tire pressure (and a hundred other things). I hear talk about how much your MH home weighs - where do we go? what is CAT scale? Thanks
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Old 09-03-2012, 05:50 PM   #12
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We are also new - and am just learning about tire pressure (and a hundred other things). I hear talk about how much your MH home weighs - where do we go? what is CAT scale? Thanks
CAT is just the name of the company running these scales. Lots of others out there, you can try local movers, just search scales in your area, or try this CAT Scale Locator | CAT Scale
Given the choice, stay away from small seldom used scales, go where the trucks do...
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Old 09-03-2012, 05:53 PM   #13
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Bunches of truck stops have scales,,, if unsure how to use them, just go inside and ask first. No biggy... Usually you'll have a drive-in like speaker to talk to when you drive up to them. Just make sure the axle to be weighed is "on" the scale, and nothing else.
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