Precautions and related knowledge when refitting tires

　　tireThere are usually three types of patterns: symmetrical, asymmetrical and single-oriented. Note that: single-orientedtire(Picture) Reverse installation will make the grip worse, the resistance on both sides will be different, reduce the braking effect of the vehicle, easy to run off, unstable direction, rainy driving is not conducive to drainage, leading to safety hazards. How to distinguish single-guide tread tires? Most of these tire patterns are similar to herringbone, with obvious direction arrows (Rotation) on both sides of the tire, indicating the forward direction of the tire. When installing the tire, pay attention to its direction and the forward direction of the vehicle. The direction is the same.

Are new tires also expired? To what extent should the tires be scrapped? Many people may be vague about the service life of tires.

According to international practice, the aging period of tires is 3-5 years, and the “lay-out period” is from the time the tire is produced to the actual use of the new car.

The aging period cannot be exceeded, otherwise it should be scrapped. If the storage period is less than the aging period of the tire and is used, the life span is determined by the wear and tear of the tire. "This is the same as if a person does not exercise for a long time, some functions of the body will decline."

There are production batch numbers on the tires, which are marked with a set of numbers and letters to indicate the year, month and quantity of the tires. For example, "99N08B5820" means the 5820 tires produced in Group B in August 1999 or "DOT0803" means this tire is It was produced in the 8th week of 2003. The production batch number is mainly used to identify the degree of newness and storage time of the tire.

Generally speaking, there are two inflection points for tire wear and tear: First, the tire tread depth wears to 3.0mm, at this time the tire braking ability and anti-skid ability begin to decline, especially in rainy days, the handling feel is particularly obvious; the second is the tire tread depth wear to 1.6 mm. At this time, the braking, driving, and anti-skid capabilities of the tires decrease linearly, and are severely reduced. When this degree of wear is reached, the tires must be replaced.

It is understood that each tire has a wear indicator mark at the position of 1.6 mm remaining depth of the tread groove. Along the triangle mark on the sidewall, the wear mark can be found in the tread pattern of the tire crown. For example, there is a "little human head" on the shoulders of Michelin tires, and the indicator mark is located at the bottom of the "little human head" tread pattern groove with a height of 1.6 mm. If the tread rubber blocks are worn to the same height as these raised marks , The tires must be replaced immediately.

"Use worn tires on wet and slippery roads, the tread pattern cannot drain the water under the tires, and'water drifting' will occur, causing the vehicle to lose control." Xiong Jianjun said, if you are worried about tire wear, you can Entrust a 4S shop or tire shop to conduct an inspection to observe whether the pattern depth and wear are within a safe range.