Abstract: A tire assembly includes a tire and an annular tube, wherein the tire further comprises securing edges and a mounting cavity, the annular tube is installed inside the mounting cavity. The annular tube having a profile of a circular form with a volute structure, so that the annular tube will not be punctured and result in a flat tire. Moreover, the manufacturing process of the tires for the present invention is very simple, so that the manufacturing costs can be reduced significantly. Meanwhile, the present invention is able to be used in an ordinary tire, to achieve the functions of safety use, convenience in operation and low manufacturing costs.