Tyre changer apparatus having
a horizontally extended frame (13); a wheel holder device (1) provided on said frame (13) and designed to support a tyred wheel (14) with horizontally positioned wheel axis (15); a carriage (5) supported movably along the frame (13);a tool holder (4) provided on the carriage (5); at least one tyre changing tool (2) for mounting the tyre onto the wheel and/or for demounting the tyre from the wheel; and actuator means to move the tool holder (4) on the carriage (5) to operating positions in which the tyre changing tool (2) is able to act on the tyre for mounting or demounting on both sides of the tyre, wherein during the mounting operation or demounting operation the carriage (5) is driven by an actuator device along the frame (13); the tool holder (4) is movably supported on a tool holder carriage (3) which is movably supported on said carriage (5) and driven by an additional actuator device (16) provided on said carriage (5), and
said actuator device (16) is in drive connection with the tool holder carriage (3) via a mechanical speed-increasing transmission (17).
