Tires are usually from the tire, inner tube, cushion with 3 parts. Also do not need the inner tube, the carcass inner layer of airtight rubber layer, and with a special rim. The structure of the tires in all countries in the world has been developed toward the tubeless, meridian structure, flat (small ratio of height and width of the tire cross section) and lightweight.

Tire is a carcass, cushioning layer (or belt), tread, sidewall and bead composition. Tire section can be divided into several separate areas: the crown area, shoulder area (tread slope), flexor zone (sidewall area), reinforced area and the bead area. ① carcass: also known as the tire. Usually refers to the force by one or several plies (with strength, softness and elasticity) and the bead as a whole (as) the force structure of the pneumatic tire.

* Ply: The carcass is composed of parallel tie glue curtain layer is the force of the tire skeleton layer to ensure that the tire has the necessary strength and dimensional stability. * Bead: The part of a tire mounted on a rim consisting of a bead core, a ply wrap and a chafer. It can withstand the tension generated by the internal pressure, but also overcome the lateral force suffered by the tire in turning during the role of the tire will not be off the rim. Therefore, it must have a high strength, the structure should be strong and firm, not prone to deformation.

The carcass needs to have sufficient strength and flexibility to withstand strong shocks and shocks and withstand multiple deformations caused by radial, lateral and circumferential forces acting on the tire during driving of the tire. The carcass is made up of one or more ply-coated carpets that give the carcass and the entire carcass the necessary strength.

② cushioning layer (or belt): skewed tire tread and carcass between the rubber ply or glue layer, does not extend to the bead of the intermediate material layer. Used to cushion external impact and protect the carcass to improve adhesion between the tread and ply. The radial structure of the tire buffer layer because of its role is different, generally known as the belt. Under the base of the radial tire tread, the material layer of the carcass is not tightened circumferentially around the centerline of the crown.

③ tread: the outermost rubber tire contact with the road surface layer (usually, the tire tread crown,

Shoulder: the crown on both sides of the edge of the tire side, the outermost part of the reinforced area rubber collectively referred to as tread rubber).

The tread is used to prevent the carcass from being mechanically damaged and worn early, to deliver the car's traction and braking force to the pavement, to increase the grip of the tire and the pavement (soil), and to absorb the oscillations of the tire during operation.

The part of the tire that is in direct contact with the road during normal driving is called the running surface. The surface of the running surface is composed of blocks of different shapes and grooves, and the protruding part is a block. The surface of the block can increase the grip of the tire and the pavement (soil) and ensure the necessary anti-slip force of the vehicle. The lower groove is called the tread base, used to cushion shock and shock.

④ The sidewall is the outer layer of ply tire rubber layer used to protect the carcass, but also flexible.

⑤ bead is installed on the rim of the tire on the part of the bead core and the chafer composed of a fixed tire role. Tire specifications to the outer diameter of the tire D, the inner diameter of the bead or rim diameter d, section width B and flat ratio (tire cross section height H / tire section width B) and other dimensions to be expressed in units of inch (in) (1in = 2.54 cm). * Fetal heel: the outer bead and rim bead seat co-operating part. * Bead core: Bead portion made of steel ring, bead apex and bead core cloth. * Traveler: A rigid ring of copper-coated steel wire that is the main component that holds the tire to the rim. * Assembly line: single or multiple rubber bead molded at the intersection of sidewall and bead, usually used to indicate the correct alignment of the tire on the rim.