Invented by Gil Coats in 1947, the Coats tire changing machines made quick work out of changing tires on rims. Over the years, the machines have evolved from the original design, but the basic premise of being a labor saving device is still present. Many models of the machines are available, from passenger tires to heavy truck and industrial tires. An entire series of machines is also dedicated to motorcycle tires.
The Model 4050 Center Post tire change is designed for passenger car tires. It can accept rim diameters from 10 inches to 17 1/2 inches. An adapter will allow it to accept rims up to 19 inches wide. The rim width can be anywhere from 1 1/2 inches to 10 1/2 inches. The maximum tire diameter it can accept is 38 inches. The required air pressure to drive the machine is 110 to 175 pounds per square inch of pressure.
The Model CHD - 9551 tire changer is designed for industrial tires found on construction and agricultural equipment. The maximum tire diameter it can accept is 95 inches, with a maximum width of 51 inches. It can accept rim diameters of 14 inches to 46 inches. An adapter is available to extend this out to 56 inches. The unit is electrically powered. The power requirements are 208 to 230 volts AC, with an amperage requirement of 22 amps. The overall dimensions are 112 inches long by 81 inches wide by 75 inches high.
The Model RC-100 is designed specifically for motorcycle tires. It has a rim diameter capacity of 10 inches to 17 1/2 inches. It can handle rim width from 1 1/2 to 10 1/2 inches. The maximum tire diameter it can handle is 40 inches. It is a pneumatic machine, requiring an air supply of 110 to 175 pounds per square inch of air. It also has electrical controls, requiring a power source of 115 volts AC at 15 amps. This is normal household current, available at any outlet.
