I used this machine to take off  20 x 8 x 8 2 ply tires from their rims. The big issue was putting the 20 x 10 x 8  FOUR ply tires on . Taking the tires off the rims was easy. Putting the new ones on was a whole different story. . The bottom beads of the 4 ply tires was easy.  The problem was getting the top bead on the rim. I bent the threaded rod and several times I  bent the bead seater tool with the ball on the end of it. My first attempt to put a 4 ply on failed after about 90 minutes effort. Second attempt another hour failure. Third time was a charm using my forearm to hold the tire down and pulling like my life depended on it to get the top bead on the rim...lol...successful!  That was the first tire. The second time taking the 2 ply off and putting 4 ply on took about 20 minutes. The device is flimsy but I don't know if it was designed to mount 4 ply tires. it seem to work great at taking the 2 plys off.  I don't like the machine but I guarantee I'll use it again instead of throwing it away. I didn't injure any body parts during this fight with the tires !