Bias tire is a kind of tire with old structure. The outer tire is composed of tread, cord layer (carcass), buffer layer and bead. The cord layer is the skeleton of the outer tire to maintain the shape and size of the outer tire. It is usually made of double layers of adhesive tape (cord fabric) bonded with rubber. The cord of the cord fabric and the center line of the tread form an angle of about 35 degrees, passing through the tread from one side to the other side. When selecting high-strength cord materials such as nylon, polyester fiber or steel wire, it can greatly improve the load carrying capacity of the tire and improve the performance of the tire. It is a kind of tire commonly used in modern cars.

The Angle between the tire cord and the steel belt belt layer cord is like the earth's meridian, so it is called the meridian tire.