Air compressor will it work?

Phew, you guys are running high air pressure in your tires. Having taken 4 corner weights on coach and run the numbers into the Michelin Inflation table for my tires I run 85 front and 95 rear. No problem maintaining those pressures with on board compressor.

May just be that my coach is a lot lighter then yours - actual weight is around 29 - 30k lbs (depends on water and fuel levels more then anything else).

IMO no it will not work. I also carry 120 lbs in my steer tires and I use a 150 psi compressor. Neither of my smaller 125 psi compressors would get me up to 120 in the tires.

125 cutout is going to be marginal for 120 lb tire pressure. If you do get it, get a clip on air chuck , that way, you can bleed the air in the tank down to kick in the compressor and with the hose clamped on the valve stem, it will fill to the 125 cutoff.

We always used Truck air to air tires on the road. Same compressor on every one.

Based on my experience NO!
Our on board air compressor is set at 125 psi. It works well to fill onbaord air tanks.
However in Shawnee, Oklahoma our left front tire was going down. The core was loose and only the cap saved us. I cranked up the mh and with a chuck that latches onto the valve and it did not leak it would not bring the tire up to 110psi.
Could not find a station with high pressure air compressor or any.
A friendly semi Driver pulled along side and connected his 125 psi compressor up
to the tire. He even revved his engine and it did no good. We could not get the tire to over 95 or 100 lbs. Over time I've forgotten exactly how much.
We eventually found a truck stop down the raoad and they aired it up almost immediately.
Air Doublers such as used on Newells and Newmars and possible others cut the amount of air but double the pressure. I haven't found one yet but when I do it will be installed. I only run 100 lbs in the Michelins now.
An extra air compressor filling up precious space just doesn't add up. An air doubler sound like the most logical solution. But....if I buy one to take along it will need to put out 150 psi. Many units you buy can put it out but for some reason NHTSA or EPA or someone won't let them operate or contain in the tank over 125 psi unless it is build so heavy as to make it an insane proposition it seems.

60 gallon at just 125? If I had that big machine it would be 175.
Just a bit more spendy...

http://www.northerntool.com/shop/tools/product_200365172_200365172

David0725 wrote:
J&R I do have a onboard compressor that goes to 120. but I have never tried it because I had a 30gal 135psi and it wouldn't do the job? this one I am looking at has 15.2 CFM 13.SCFM @40PSI AND 10.5 @ 90PSI Not sure what all that means?. 240v 6.5 hp.. 60gal. I didn't think one of them pancakes 150psi would do it because of the tank being so small.

For filling tires, the tank size makes about zero difference, and the flow rate (well, after a point at least) not much difference. The flow is more limited by the tire valve than what the compressor is capable of pushing out. (That's the SCFM @ PSI ratings: standard cubic feet per minute at whatever pressure. Many air tools use 90 psi, and varying amounts of air. If the tool requires more than 10.5 SCFM, the compressor won't be able to keep up with continuous usage, though you can get decent bursts of use due to the air stored in the tank.)

If you're actually trying to inflate your tires above maybe 100psi or so, the difference in pressure will make a very real difference in how fast the last bit goes. A 5 psi difference (between 120 psi in the tire and 125 in the compressor tank) doesn't lead to much airflow into the tire, while a 15 psi difference would be a lot less slow--but still not super quick.

I'm wondering why the OP needs 120 psi in his tires. Must ride like a Flintstone-mobile.

get an air chuck that locks onto valve stem , while you wait.