Classification According to Structure

(1) Bias Tire

Layers of one ply cord material are placed on the tire carcass diagonally from one tire bead to the other at angles of about 40° to the centerline of the tread. The lengthy research and development period have given this tire an overall steady performance and stiff sidewall. With the advent of the radial tire however, the bias tire is now used much less frequently.

(2) Radial Tire

A radial tire uses a cord angle of 90 degrees. That is, the cord material runs in a radial or direct line from one bead to the other across the tread. In addition, a radial tire has a belt overwrap under the tread surface to provide greater structural stability. The belt overwrap of a radial tire distortion while the radial structure enables high speed driving.

Note: Belted Bias Tire
A radial tire-like belt is attached to a bias tire carcass. The belt increases the stiffness of the improves traction for better steering and stability. However, the belted bias tire is generally product from the transition of a bias structure to radial structure and is not widely used.

(3) TubelessTire

As cars became faster, the tubeless tire was developed to protect drivers and cars from the dangers of flat tire accidents while driving at high speeds. Instead of using a tube, a lining (inner liner) of special rubber with low air permeability inside the tire prevents air leaks from the tire and rim. This means that even if a nail punctures the tire while on the move, air pressure will not be lost very rapidly. However, careful tire maintenance is still necessary as there is no tire that does not go flat. In addition, there are tubeless tires that use airtight, highly binding cement on the inside of the inner liner to decrease air leakage even further.