1. Ordinary bias tire is the structure of ordinary bias tire with inner tube. Bias tire mainly consists of tread, ply, buffer layer and bead. The cords of the ply and the buffer layer of the ordinary bias tire intersect each other and are arranged at an angle of less than 90 degrees to the center line of the tread.
2. The plies of radial tires are arranged at an angle of 90 degrees or close to 90 degrees with the center line of the tread, which is consistent with the meridian section of ply tires, much like the meridian on the earth, so it is called radial tire. Due to the arrangement of the plies, the number of plies of radial tires can be reduced by about 40%-50% compared with ordinary bias tires. The radial tire is only connected by rubber in the circumferential direction, so in order to withstand the large tangential force generated during driving and improve the rigidity of the tire, the radial tire also has several layers of cords at a large angle with the meridian section (the included angle is 70- 75), a belt layer similar to a buffer belt with high strength and not easy to stretch. The belt layer is generally made of fabric cord (such as glass fiber, polyamide fiber) or steel cord with high strength and low tensile deformation.