I even tried 2 straps.
It takes me less than a minute to mount a small 4ply front mower tire. Here's what you do. Get two small vice grip pliers(you can use the average size ones but the smaller ones work better; if at least one of them is a small one it is enough you can still work around the big one) and two large flat blade screwdrivers and some tire bead soap and a piece of plywood to work on on the ground if you're on dirt/grass. Soap both beads real good and press the tire on with your hands on one side. If its tight use one of the flat blade scredwdrivers to help it the last part of the way; it will usually go on on the first side real easy. Remember to keep the opposite side down into the deep center groove in the center of the rim so it will fit over on the other side you're trying mount. Now, mount one edge of the second bead under the edge of the rim. Clip on one of the vice grip pliers on the edge lip of the rim to hold the bead down and in place. Now take a big screwdriver and go under the bead on the opposite side and while pushing down on the tire sidewall on the side next to the vice grips pull the bead down into the center groove on the rim and and hold it. Now at the farthest place you can away from the first vice grip snap the second vice grip to hold the bead down by the rim. Now take the two big screwdrivers and work the bead on around the rim and REMEMBER TO PUSH THE TIRE BEAD DOWN ON THE SIDE OPPOSITE THE SIDE YOU ARE WORKING ON INTO THE CENTER GROOVE OF THE RIM. The bead will fall right into place.Guys, all mower tires need to go to a real tire shop. Sorry but some of them are a huge pain in the rump. Shops only charge a couple bucks for those small tires anyway. I don't even mess with them anymore. Got better things to do like slugging down some adult beverages on a hot summer day.
I've seen guys use a piece of steel rod mounted in a vice and put the rim on the rod but I never have any problem mounting small mower tires with two small vice grip pliers and two big flat blade screwdrivers. The trick is pushing the tire bead into the deep rim groove while you are prying with the screwdriver. Use your hand or something you can hold that will push the bead into that groove while you pry. Remember only one bead will stay in that groove at a time. I do it on the ground with my hands and it takes about a minute. Hard tires to mount? Those thick bead 19" rim tires like you see on tow trucks and some box vans and you use vice grips on them too when you don't have a coates machine to do it on. My biggest peeve tire wise is those dirt bike racing tires with the rims with two or more bead locks.I found a way to modify a harbor freight tire changer so I can mount smaller tires. The bench one they sell is too chincy.
I used them on semi-truck tires and automotive or work truck tires but not small tires. I definitely wouldn't fill it to max pressure if I did.I had one of those that burst air inside the tire could not get it to seat a tire.