Tyre

Tyres

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

Also, long before there were rubber tyres, their were iron or steel bands shrink-fitted to wooden wheels which tied the wheel structure together as well as providing a hard-wearing surface. As a result of their function, they were known as “tyers”. Eventually they became “tyres”.