Installed tire summary

Our previous article has detailed the tire maintenance. Recently, Xiao Bian has learned some of the neglected tire knowledge and I would like to share with you.

The tire production date will be discriminated as well as security:

Tires are rubber products, so rubber aging also occurs. The shelf life of tire rubber is generally 4-5 years. Tire rubber accelerates aging after the shelf life, resulting in reduced tire performance.

As shown above, "9MCR0810" is the tire production date code. Among them, the last four “0810” indicate that the tire was produced on the “8th” week of “10”.

Looking at the tire production date does not mean that the tire you bought must be new. Some unscrupulous traders modified the production date marks on the tires through special molds, and used the expired tires as sales of new tires to earn high price difference. In general, an unscrupulous trader tampers with the production date of a tire by polishing or removing the original date of manufacture on the tire, and then affixing a new logo. As a result, the production date marks of these “retrofitting tires” and the tires are not integral, and seams or irregularities are generally found at the edges of the logos. When consumers purchase tires, they should pay attention to whether there is joints or unevenness on the edge of the marking date of the tire production date, and avoid buying inferior “retrofitting tires”.

Pay attention to the inner and outer directions when installing the tire:

The inner and outer tires of the tire will greatly reduce the drainage performance and grip performance of tires with single guide or asymmetric tread. If you find that the tire has a reversed inner and outer mounting, please re-install the tire at the repair shop immediately.

The outside of the tire is generally printed with the word "OUTSIDE", the date of manufacture, or the "DOT" mark. One of these three kinds of logos can determine the outside of the tire.

The lightest mark on the tire's sidewall:

Tire as a composite rubber body, its mass distribution is difficult to achieve absolute uniformity. Therefore, some manufacturers will mark the lightest point of the tire on the tire's sidewall. The wheel is mainly composed of three parts: hub, tire, and valve. The position of the valve installed on the wheel hub is of the highest quality, so the tire should be installed with the lightest point marking corresponding to the installation of the valve, which will play a complementary role and make the overall tire mass distribution tend to balance.

The maximum vibration point mark on the tire's sidewall:

The maximum vibration point marking of the tire identifies the maximum point of longitudinal rigidity of the tire. During the rotation of the tire, the point of maximum vibration is at the position marked by the maximum vibration point. When the tire rotates on the ground for one week, the vibration force it experiences at each angle is not equal. This phenomenon is called RFV (Radial Force Variation). When the RFV is too large, the tire will produce vibration that can be perceived by the driver, affecting the driving comfort of the vehicle. Generally, a large-scale tire manufacturer will mark the position of the tire on the tire during product inspection. If the vibration value of the tire product is found to be excessive, it will be treated as a waste product. The maximum vibration point mark for the tire is of little significance to consumers, so you will not see this mark on all products in the market. However, the RFV parameter is an important standard for the homogeneity of the tire material. Testing the RFV is a quality inspection process that must be performed by the tire company during production.