6.2.5.b Frame
The carcass serves as the basis of the tire. It connects all its parts into one whole and provides for the necessary rigidity, while it has high elasticity and strength. The frame is made of several layers of cord 1-1.5 mm thick. The number of cord layers is even in order to distribute the structural strength evenly and is usually 4 or 6 (for passenger car tires) and 6-14 (for truck and bus tires).
Interesting
With an increase in the number of layers of cord, the strength of the tire increases, but at the same time its mass increases and the rolling resistance increases, which is unacceptable.
2 MB