A tire changer is a machine used to help tire technicians dismount and mount tires with automobile wheels.A tire changer is a machine used to help tire technicians dismount and mount tires with automobile wheels. After the wheel and tire assembly are removed from the automobile, the tire changer has all the components necessary to remove and replace the tire from the wheel.On a semi-automatic tyre changer, the head and locking plate is bolted and the handle mounted at the front/side of the column by the swing arm. In comparison, on a fully automatic tyre machine the whole rear column operates through pneumatics, using compressed air to manoeuvre the mounting head and locking it in place.The tire is rolled in between the bead breaker arm and the padded side of the machine. The bead breaker blade is placed on the tire bead and slightly off of the wheel lip as to not contact the wheel rim. The pedal is activated to break the bead away from the wheel. Keep hands and legs away from moving parts.