I have 22.5 " tires on my 2011 Fleetwood Southwind. My portable home compressor is rated for 110 PSI. I took it to the place where I store the RV and attempted to put air in a few tires that were reading low.I like to keep 100 PSI in all 6 of my tires. The compressor would not handle it.In fact I lost some air in the tires. I called my son-in-law (mechanic) and was told "if the volume of the tire is greater then the compressor tank volume,the compressor would not put out enough "constant" PSI to put air in the tires". I guess this is the case. To make a real long story short,can anyone with 22.5" tires recommend a small portable compressor that will have the ability to put out 110 PSI into a 22.5" tire? I plan on going cross country in the late spring and will need to carry a compressor on board for obvious reasons.

Volume has nothing to do with it other than how long it will take. If your current compressor does put out 110 then it will eventially fill your tires to 100. Sounds like it does not put out even 100. How did you come up with needing 100?

brao wrote:son-in-law (mechanic) and was told "if the volume of the tire is greater then (sic) the compressor tank volume,the compressor would not put out enough "constant" PSI to put air in the tires". No. It's pressure differential that puts air in the tires, and if that pressure is not at least 20lb more than what you want in the tire, it's going to take a long time..Compressor 2009Compressor 2010Compressor 2011

If you let your air compressor build up to 110 and shut off the air tire and stop when compressor kicks on you should eventually get tires aired to 100 lbs.I do it with a 12 volt compressor ,it seems to take forever but it gets there.I also carry 100 psi in mine.

Most diesel motor homes will have a air coupling in the front to air up the tanks in case a tow is needed. I purchased two twenty foot coil air hoses and a chuck for airing up the tires. Your engine driven compressor should be putting out about 120 psi and you can tap into that system using the air hose. Good thing also it is dry air unlike the little portable compressors. Can also be used to blow up tubes and air mattresses ect.Blessings; kdk

Get a 6 gal 110v pancake compressor and run it off your generator.Most 12vdc compressors just do not have what it takes to air up 22.5 tires. You can also consider using a compressed CO2 air tank system from one of the big box stores. You will find some info here: Tire Inflator Comparison Some of them will work.

22.5 tires/air volume | Good Sam Community

down_home
Explorer II
Oct 05, 2013
Even the onboard compressor won't fill the tires, even those on Semis or at least Freightliner.
I'm not sure how they determine the pressue they put out but it is not logical since a 125 lb pressure compressor wont fill a tire to 110 lbs or even 100 sometimes.
They make an air doubler. Ives seen one on the Internet,a little pricey. They did come installed on Newmar. I've seen small 150 lbs compressors with twin tanks but they quite making them. You should have plenty of ac power on board and at least a couple, of compartments with ac plugs. It does take up valuable space to store one that is capable. The air doubler or pressure doubler can be installed in the compartment where the air compressor chuck is. There is plenty of room in ours.
txtode
Explorer
Oct 05, 2013
I have a 1.5 gal Craftsman 150 PSI that takes care of filling my tires to 110PSI with no problem.
wny_pat1
Explorer
Oct 05, 2013
Get a 6 gal 110v pancake compressor and run it off your generator.

Most 12vdc compressors just do not have what it takes to air up 22.5 tires. You can also consider using a compressed CO2 air tank system from one of the big box stores. You will find some info here: Tire Inflator Comparison Some of them will work.
kdk
Explorer
Oct 05, 2013
Most diesel motor homes will have a air coupling in the front to air up the tanks in case a tow is needed. I purchased two twenty foot coil air hoses and a chuck for airing up the tires. Your engine driven compressor should be putting out about 120 psi and you can tap into that system using the air hose. Good thing also it is dry air unlike the little portable compressors. Can also be used to blow up tubes and air mattresses ect.
Blessings; kdk
dakdave
Explorer
Oct 05, 2013
If you let your air compressor build up to 110 and shut off the air tire and stop when compressor kicks on you should eventually get tires aired to 100 lbs.I do it with a 12 volt compressor ,it seems to take forever but it gets there.I also carry 100 psi in mine.
2oldman
Explorer II
Oct 05, 2013
brao wrote:
son-in-law (mechanic) and was told "if the volume of the tire is greater then (sic) the compressor tank volume,the compressor would not put out enough "constant" PSI to put air in the tires".
No. It's pressure differential that puts air in the tires, and if that pressure is not at least 20lb more than what you want in the tire, it's going to take a long time..

Compressor 2009
Compressor 2010
Compressor 2011
Ivylog
Explorer III
Oct 05, 2013
Volume has nothing to do with it other than how long it will take. If your current compressor does put out 110 then it will eventially fill your tires to 100. Sounds like it does not put out even 100. How did you come up with needing 100?

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