Abstract: A tire changing device including a rotatable shaft with means for mounting rise rims thereon for the mounting and demounting of tires from rims which shaft is rotatably powdered and including a pair of vertically shiftable bead breaking units which will engage the tire from the upper side of the rim thereby breaking the bead as the tire is rotated and thereafter the lower of such pairs is brought upwardly to break the lower bead of the mounted tire and for demounting the lower member is brought further upwardly to remove the entire tire from the rim. The second lower pair of elements includes a pair of shaped disc members which will not only break the bead but will also force the tire from the rim. Power means are provided for moving the pair of elements vertically and positioning means are provided to shift these elements such that tires and rims of various sizes may be accommodated.