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Heavy-duty tire changers require larger equipment because these changers deal with larger, heavier tires and wheels. Heavy-duty tire changers can work with some wheels up to 56 inches (1.4 m) in diameter and tires up to 90.5 inches (2.30 m) in diameter and 43 inches (1.1 m) wide. [5]
Tire irons, which usually come in pairs or threes, are used to pry the edge of a tire away from the rim of the wheel it has been mounted on. After one iron has pried a portion of the tire from its wheel, it is held in position while a second iron is applied further along the tire to pry more of the tire away from the wheel.