adjacent the bottom of panel 25 midway between bars 54 and 55 a hose 80 is coupled to cylinder 52 and to a supply of air not shown and a control 53 for the cylinder is provided at the front of machine 10 for extending the piston of cylinder 52 likewise the control can cause removal of the air from cylinder 52 the piston 82 of cylinder 52 is coupled to a cross bar 81 which is just slightly narrower than the distance between bars 54 and 55 and two plates 85 pivotally connect the bars 54 and 55 and the cross bar 81 the plates 85 are coupled to bars 54 and 55 by pins 86 about 1 3 of the way between end plate 25 and frame 59 it will be evident from the foregoing description that extension of piston 82 will raise bars 54 and 55 and the lift frame 59 toward the tire support and rotation assembly 12 the spreader arms 16 can best be described by reference to fig1 and 3 the arms 16 are designed not only to pull apart the beads of tire 50 but to pull down on them a feature which is especially important when machine 10 is to be used with radial tires spreader arms 16 each include a pair of arm elements 90.