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09-02-2012, 02:57 PM
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#1
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Junior Member
Join Date: May 2012
Posts: 15
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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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09-02-2012, 03:05 PM
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#2
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Registered User
Vintage RV Owners Club Gulf Streamers Club
Join Date: Oct 2010
Location: Indiana
Posts: 4,951
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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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09-02-2012, 03:19 PM
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#3
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Senior Member
Join Date: Jun 2012
Location: AB
Posts: 7,587
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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,,,
__________________
2019 Unity LTV CB, pushed by a 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake
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09-02-2012, 03:38 PM
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#4
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Senior Member
Join Date: Sep 2011
Location: Arkansas
Posts: 2,500
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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
__________________
Monkey, pilot of a Great Dane hauler,
2015 Silverado 2500 Duramax/Alison 4x4 CrewCab 2016 Cougar 28SGS
1ST CAV
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09-02-2012, 03:45 PM
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#5
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Senior Member
Join Date: Jun 2012
Location: AB
Posts: 7,587
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Quote:
Originally Posted by monkey
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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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.
__________________
2019 Unity LTV CB, pushed by a 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake
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09-02-2012, 03:48 PM
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#6
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Registered User
Vintage RV Owners Club Gulf Streamers Club
Join Date: Oct 2010
Location: Indiana
Posts: 4,951
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Quote:
Originally Posted by dennis45
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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The MAX PSI on the tire is MAX PSI COLD. It can go over that while hot...
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09-02-2012, 03:51 PM
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#7
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Senior Member
Join Date: Sep 2011
Location: Arkansas
Posts: 2,500
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Quote:
Originally Posted by dennis45
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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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...
__________________
Monkey, pilot of a Great Dane hauler,
2015 Silverado 2500 Duramax/Alison 4x4 CrewCab 2016 Cougar 28SGS
1ST CAV
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09-02-2012, 06:19 PM
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#8
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Feb 2008
Location: Pensacola, Florida
Posts: 5,173
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Quote:
Originally Posted by Midniteoyl
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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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.
__________________
Travel well, travel safe,
Jim
2006 Tiffin Phaeton - 2011 Cadillac SRX
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09-03-2012, 08:52 AM
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#9
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Junior Member
Join Date: May 2012
Posts: 15
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can you tell i am new to this
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09-03-2012, 10:05 AM
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#10
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Registered User
Vintage RV Owners Club Gulf Streamers Club
Join Date: Oct 2010
Location: Indiana
Posts: 4,951
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Quote:
Originally Posted by Papashap
can you tell i am new to this
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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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09-03-2012, 01:23 PM
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#11
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Senior Member
Join Date: Jul 2012
Posts: 114
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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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09-03-2012, 04:50 PM
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#12
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Senior Member
Join Date: Sep 2011
Location: Arkansas
Posts: 2,500
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Quote:
Originally Posted by frazierdee
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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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...
__________________
Monkey, pilot of a Great Dane hauler,
2015 Silverado 2500 Duramax/Alison 4x4 CrewCab 2016 Cougar 28SGS
1ST CAV
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09-03-2012, 04:53 PM
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#13
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Senior Member
Join Date: Sep 2011
Location: Arkansas
Posts: 2,500
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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.
__________________
Monkey, pilot of a Great Dane hauler,
2015 Silverado 2500 Duramax/Alison 4x4 CrewCab 2016 Cougar 28SGS
1ST CAV
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