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.Special pneumatic assist arms have been added to aid the tire changer in changing difficult stiff sidewall and low profile tires. These assist arms are air hydraulic and have the power needed to push the tire beads into the wheel's drop center to allow the tire to be mounted or demounted.In 1947, Gil Coats first designed a wheel holder for changing tractor tires in his farm-implement business. His invention quickly evolved into the world's first semi-automatic tire changer and it launched one of the most respected and recognizable brands in the tire-service equipment industry.