A car is composed of thousands of parts, and each part, the general can only play a role. Tires, auto parts is one, but, the truck tires and other components of the role played by is not the same, it in the car travel to play the following four functions.

In 1, bear the load.

A car regardless of its weight, or takes the person or object, its weight is to go through the body to the tire, finally by the tire shoulder all the burdens, so, tire in bearing plays a very important role.

In 2, episodes of driving force and brake force

Because the tire is only in contact with the road car parts, therefore, whether it is a car starting, braking, parking trek, still should pass the tyre and the road " communication", and through the tire to end car or drive staff voluntarily.

In 3, buffer and shock absorption

Without a paved road, is mostly rugged gravel, pavement has many stone or pit, package, even paved road, there is often some obstacles, affects the vehicle's normal trek. In this case, the tire will carry forward its excellent buffer and shock-absorbing function, so that vehicles can be more comfortable circumstances. This is because, the tire itself is composed of 50% elastic or rubber, and the air in the tire of excellent shock absorption function, so can the car in bad pavement can also easily.

In 4, changes in automobile travel direction

Whether to still turn required by the car's tires to end, it often according to the drive member to change the direction of vehicle travel voluntarily.

Because of the tire with the four role, therefore, the automobile can be in uneven road safety, freedom, sensitive, comfortable journey; also because it has the four functions, therefore, the tire in the whole automobile parts of importance can not be ignored.

Mention of tire type, there are many kinds of method: according to vehicle classification, classification according to use, according to size, according to the markings classification, classification according to plan.

According to vehicle classification

Tire press vehicle classification, can be roughly divided into 8 types. Namely: PC -- LT -- car tire; light truck tire; TB -- truck and bus tire; AG -- agricultural vehicle tires; OTR -- engineering tyre; ID -- industrial vehicle tires; AC -- MC -- aircraft tire; motorcycle tire.

According to the classification of tire use

Tire press use classification, including truck tires, car tire and tire and other varieties of mine use.

Truck tire except in the sidewall superscript standard standard outside, still must indicate layer series. But here we need notice is, truck tire layer series does not refer to its theoretical layers, but refers to the use of high strength materials cord manufacturing the tire carcass, the load function is equivalent to using a cotton cord manufacturing the tire carcass ply rating. This is because cotton cord is first used in the manufacture of tire cord, therefore, international practice with cotton cord layer for marking tire plies benchmark. Not the same level, tire load can not. Even as a standard tire, due to its layer series is different, its load to is not the same, therefore, different levels of tyre, not on the same axis use, otherwise, running at high speed and load condition would be a risk. For example: the liberation of vehicle 900 - 20 tyres ( 16 level ) can not and 900 - 20 tyres ( 14 level ) and use of the same in a shaft, due to their different load levels, is not the same as, mix after brief seizure risk