★Large & strong round column, enhance the mounting and dismounting stability. ★Suitable for 11’’-21” rim, semi-automatic tyre changer, dismounting tyre without fitting and device to 18” rim. ★The clamping jaws and mounting and demounting head are made of high-quality alloy steel and of scientific structural design which protects steel rim from any damage during operation. Technical Data: Power Supply: 110V/220V/380V/50~60HZ Motor Power:0.75/1.1KW Outside Clamping: 11’’~18”/279~457mm Inside Clamping: 12”~21”/305~533mm Max. Wheel diameter: 37.8”/960mm Max. Wheel Width: 10”/255mm Bead-breaker force: 2500kgf Operating pressure: 8~10bar Noise<70db Net weight: 174kg Gross weight: 198kg