Tire Changing Machine Left Auxiliary Arm Tyre Wheel Assist Arm Changer 120mm 36mm. 1x Tire Changer Machine Auxiliary Arm Italian Tire Head 120mm 36mm. Adjustable Arm: The arm is adjustable, allowing it to be positioned at the appropriate height and angle for optimal tire changing performance, providing a professional, non-destructive, and easy way to replace tires that will be your right-hand assistant.