What is A Tyre and What Are It’s Types? Explained

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Tyre: Classification and Nomenclature

Tyre (or tire) is a circular and ring-like part of a vehicle which comes in contact with ground. Tyres are fitted on rims and are filled with compressed air. Since their invention, natural rubber is the most widely used material in manufacturing of tyres. However, modern tyres also employ materials like synthetic rubber, fabric, steel wires, carbon black and some more compounds. Tyres find place in wide range of locomotives, from bicycles to aeroplanes.

Classification of tyres:

Radial tyre construction (Courtesy: Bridgestone)

In general, there are two major classes of tyres, according to the presence or absence of tubes in them. Thus, they are called 'tubed tyres' and 'tubeless tyres' respectively. Furthermore, based on the construction or skeleton of tyres known as carcass, tyres are classified into the following main types:

1. Cross-ply or bias-ply: In these tyres, ply cords are at an angle of 30°-40° to the tire axis. 

2. Radial ply: In these tyres, ply cords run in the radial direction.

3. Belted-bias ply: This is a combination of the above mentioned types.

However, majority of the tyres used nowadays belong to the class of radial tubeless tyres.   

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