The structure of a tire is composed of crown (tread), sidewall, tire lip, carcass (ply+belt), inner wall and inner tube (if any). The structure and function of each part of the tire are described as follows: the crown-also known as the tread-is a hard rubber part that directly contacts the ground, which has good wear resistance and considerable hardness, and plays a role in protecting the internal structure and producing ground adhesion.

For electric vehicles including electric motorcycles, the quality of tread determines its wear resistance and puncture resistance. For example, the treads of Zheng Xin Gong Long Fu and Jianda Tiejialong use rubber mixed with special materials.

Tire wall-Although it is not in direct contact with the road surface, it also has the important task of protecting the internal structure, such as ply, belt, inner wall and inner tube. When the vehicle is running, the pulling force on this part is also the largest, and various tire signs such as tire size specifications, manufacturer's trademark marks and wear indication marks are engraved on this part.

Tire lip-the annular structure at the joint between tire and rim, with piano steel wire rolled in the middle to form a skeleton, which is also the fixed skeleton of carcass part.

The carcass is composed of the ply and the buffer layer, which is the matrix of the whole tire. Generally, it is woven with nylon, man-made fiber or PTFE to bear the load of the wheel, the air pressure inside the tire and the transverse and longitudinal shear forces.

The so-called number of layers refers to the tire arm carcass structure, which is not very demanding for electric vehicles with limited weight.