Definition of Carcass

The tyre carcass comprises what most people think of as the entire main body of a tyre, often called the casing, including the materials under the tread, the sidewall and steel belts.

The tyre carcass is the composite structure of the tyre in the manufacturing process, with the layers of rubber-coated plies (made of polyester, nylon, rayon, or steel) that comprise the resistant structure of the tyre upon which the tread, belts, bead and sidewall are laid.

A simple radial carcass is unstable so a belt is put on the radial carcass under the tread to reinforce the tyre carcass.