Are the run-flat tires on the market really run-proof? What is the truth?
In tire companies, there has never been a term for "run-flat tires"
"Run-proof tires" were spoiled by the manufacturer's marketing department. This is a "wife cake" naming method. , causing many people to rub the back of their heads and say to themselves after a tire blowout, why did it blow up if they didn’t say it was explosion-proof?
In fact, the real scientific name of run-flat tires is run-flat tires. As the name suggests, this kind of special tire can ensure that the car can drive normally at low speeds even when the tire pressure is very low or even zero. a certain distance. This type of tire has a relatively hard sidewall and a specially designed small bump on the rim to prevent the tread from detaching from the rim after a sudden drop in pressure.
"Run-flat tires" are actually called "run-flat tires" within tire manufacturers. In the professional field, they are more accurately called "zero-pressure continuous running tires". In China, they are called "run-flat tires" "It's relatively late. Internationally, it existed in the last century, but China only started to develop related technologies in 2006. As far as Xing Ye knows, there are only 2-3 companies that are still persisting.
The biggest function of run-flat tires is actually to reduce the chance of losing control due to tire blowout. The second is to continue driving for a limited distance, and finally, there is no spare tire and no trunk space.
Why is "explosion-proof" an inaccurate term?
A tire blowout only refers to a sudden rupture of less than 0.1 seconds, resulting in a loss of air; therefore, a lack of air is not called a tire blowout. The reason for bulges is that run-flat tires are generally used in high-end cars. In order to provide better driving control, high-end cars generally have a lower flatness ratio, which causes run-flat tires to have more bulges in some cases. , this can be considered to have pros and cons.
In fact, run-flat tires limit the performance of the car
The comfort of run-flat tires is poor, which is caused by the longitudinal stiffness of the tires. In addition to having a large unsprung weight, run-flat tires also have poor envelope properties and poor shock absorption due to their structural characteristics. The 25 stiffness of ordinary tires is generated by the tire structure, and the 75 stiffness is generated by the inflation pressure; the run-flat tire is 50:50, which results in greater shock absorption and tire noise than ordinary tires of the same level.
To sum up, the run-proof tires on the market are not really explosion-proof.