Originally Posted by tmaxx
I've got a 29' class c rv with dual tires on the rear. I have it covered for the winter. I noticed today that the outer back tire has only 30 psi. I had a small compressor (3gallon, 100psi) which I carried out to the rv to air up the tire. It took about 15min just to raise it 10psi. I think the compressor is just too weak. I want to buy a new one that I can use when the tires get low. I want one that is not too bulky. Can someone suggest what size I need for airing up my rv tires?
If your tire leaked down to 30 you have a problem. Are you 100% certain the tire was no more than 10% low when you last drove it at the end of the last trip?
If you drove with 20% or more air loss you may have done damage and should have professional service and complete inspection of the tire.
I just did a post on the safety
RE inflating a tire Large 22.5 tires run about 5 - 8 Cu-Ft. you can figure how much compressor you need by looking at Cu-Ft per min at 100 psi to learn how long it will take to raise pressure 1 psi.for each Cu-Ft.
If you need to add more than 10% you will need a LARGE compressor. But if you monitor your tires you should be able to just top them up at a truck stop.
I have covered the question of compressors and inflation a number of times..