Is the tire divided into positive and negative? What do you think of the specifications?

Tires are divided into positive and negative. Generally, there is an "outside" sign on the outside of the tire. This is also the most common sign on the tire. If it is installed reversely, it will show the "inside" sign. If you see it, remember to change it back quickly.

Some tires are not marked, so professionals will distinguish them according to the number on the tires. For example, the "3520" on the outside of the tire means that it was produced in the 35th week of the 20th year, and this side is facing out (there is a tip: remember to see if four tires have a production date when you buy a new car).

Snow tire usually has production date on both sides and no "outside" sign. In this case, it needs to be distinguished according to the arrow mark on the tire. The arrow marks the direction in which the tire is rolling.

Tire size is composed of tire section width, percentage of flat ratio, wheel hub size, load index and vehicle speed.

For example, 215 / 60 R16 77h. Among them, 215 means the tire width is 215mm, and 60 means the flat ratio of the tire width is 60%. R16 is suitable for 16 inch wheel hub, 77 is load specification, h is speed grade.