Wheel-holder, tire changer apparatus using said wheel-holder and adjustment process of said wheel-holder

A wheel-holder for a wheel of a vehicle, said wheel-holder comprising:

• a support base having a seat,
• a shaft housed at least partially in the seat, wherein the shaft is slidingly movable with respect to the support base between a plurality of operating positions, wherein the shaft comprises a plurality of stops defined on an outer lateral surface of said shaft,
• a support plate configured to receive a rim of a wheel, wherein the support plate is carried by at least one of the shaft and the support base,
• a block carried by the support base and configured to engage at least one stop for locking the shaft in an operating position, preventing the relative sliding between the support base and the shaft, wherein the block comprises:
• at least one insert movable approaching and away with respect to the shaft,
• a maneuvering element active on the insert and configurable between:
• a thrust position where the maneuvering element thrusts on at least a part of the insert to allow it to be engaged with at least one stop and lock the relative sliding between support base and shaft,
• a release position where the maneuvering element is configured to allow the insert to move away from the shaft,
• characterized by the fact that the block comprises at least one pusher which, in the release position of the maneuvering element, thrusts on at least a part of said insert to maintain said part in engagement with at least one stop of the shaft.