In early pneumatic tires, the carcass was coated canvas. Because the longitudinal and transverse lines of canvas cross each other, the lines rub against each other because of tire deformation when walking; This is easy to wear off the line, and the tire can only run 200-300km at this time. 1903, Mr. J. F. Palmer invented twill textiles, which promoted the development of cross-ply tire and made the tire life take a big step forward. Because the carcass of the fork will no longer be rubbed by the running of the tire, the cord is not easy to be worn off, so the service life is greatly prolonged. Michelin made the first tubeless tire at 1930; 1946, invented the world-famous radial tire. Therefore, the development of tires has gone through a long process. In this long night, I don't know how many generations have paid hard work and superb wisdom for this.

How often does your car change its tires? When changing tires, do you know how to choose factory tires? In order to save money, some car owners will choose some cheap tires that may have a "big discount" when purchasing tires. At this time, you should be careful! Automobile tires themselves are easily worn products of vehicles, and the replacement frequency is high, especially when they are replaced, they are replaced in pairs as soon as they are replaced. It is precisely because of this that many unscrupulous merchants see the business opportunities on the tires, and then innovate the tires and sell them to the owners at a cheaper price.

In fact, tire innovation is very simple: First, businesses buy back old tires everywhere. When they innovate, they first stand up the old tires and fix them. Then, they gradually find a good position along the original concave texture of the tire tread, repair the damaged part of the tire, and then tie it with special tape along the texture.

Pull up the leucorrhea and surround the position. After pulling up, after a new dent appears in the depression, the texture and new dent on the front and side of the tire are gradually polished with a grinder. Of course, all kinds of symbols on the original tires are polished.

After grinding new textures, new dents, various symbols and signs, spray some special tire paint. A "brand new" tire will be reborn. It is said that tire innovation is very simple, and it takes about 2 minutes to innovate a new tire. I don't know how many of these tires ended up in the hands of the owners. After tire innovation, although the appearance of the tire is brand-new, it is actually a "second-hand tire" now. When a vehicle is equipped with this kind of tire on the road, there may be a scene of tire puncture, which has certain safety hazards.

You see, since "innovative fetus" is so terrible, how can we distinguish between "new fetus" and "innovative fetus"?

Distinguish point one:

In terms of texture, the groove is shallow because the processing of defective and innovative tires is not standardized. In terms of color, the defective innovative tire looks bright and shiny, while the standard tire is relatively dark. The color of the modified tire is dim.

Distinguish point two:

Investigate the overlap between tread and sidewall, mainly to see whether the sidewall and various signs are complete, and all tire manufacturers have zebra codes to see whether the zebra codes correspond to tire signs. Secondly, it depends on whether the contact between the tread and the carcass at the shoulder is smooth. Innovative tires are all self-denying. The overlapping part of tread and sidewall is not flat and smooth, and there are contact marks on the tire side.

Distinguish point three:

Tire Symbols Brand tires produced by manufacturers have some raised symbols on the tires, indicating the types and functions of tires. The warranty date is printed inside, and the wear symbol in the tread anti-slip groove is clearly visible. Usually, most symbols of innovative tires are processed from scratch. Scraping these symbols with your nails must be an innovative tire. Together, every qualified brand-new tire will have a special wear mark after leaving the factory. Usually, the outside of the tire will be printed with TWI or small triangle marks. If the mark is not clear, the tire will be badly worn and need to be scrapped. The innovation sign of the defective second child is posted by the workshop itself, which can be distinguished by grasping it by hand. In addition, you can also hold both ends of the tire, and the defective innovative tire is softer.

The most important thing:

First of all, you can't save money blindly. Shops next to the road can change innovative tires at will. Secondly, there are few innovative automobile tires in China now, so be careful to buy those that claim to be innovative, because they are particularly cheap. Some merchants sell innovative tires to consumers in the name of "90% new tires" that have not been worn for a long time. In fact, they are all outdated tires now, so be careful. In direct sunlight or rain, it will not cause discoloration and small cracks. If it is exposed to direct sunlight or rain, it will accelerate the aging of rubber if it is left outdoors for a long time. Protect tires from direct sunlight, ultraviolet radiation, rain, ozone, oil pollution and high temperature. When keeping the tires, it is very important to put them in a dark and cool place to let the air in the tires out.