I just filled a set of 26 X 12 x12's with a little pump I had laying around. It's a Flo Jet pump that I used to have on my race car to pump tranny fluid to a cooler. It's 12 volt but I also have a 12 volt power supply. Normally I take the tires to the local tire shop and have them break the bead on the valve stem side as I've mentioned before but I will need to fill a set of tires on my 121 that have tubes so I figured I'd try this pump and see how it did on the big rubber. Had the hoses kind of jury rigged but it went well. Just pulled the valve cores out and slid the 3/8" hose ove the stem and let it rip. I let the air out of the tire after every gal. I may get one of those tire fillers that TSC sells and make up something a little more permanent for the future. Anyway I put 8 gals in each tire probably took 20 mins.
