Out shop compressor is set at 175 PSI and is a 75 gallon compressor. It take me on average 1(one) minute per 10 lbs to inflate Motorhome tires. So, if the tire requires 120 PSI and the tire is at 90(this is usually what customers have dropped to), It takes me about 3 to 5 minutes to air up that 1 tire. HOW long do you think it would take this cheap type of system to fill a motorhome tire that requires in excess of 60 psi? A LONG TIME, if it can ever get it that high, regardless of its 200 psi rating. Those type tools are best for Auto/Trailer tires. Doug