The tire traction force represents the parking performance of the tire on a wet straight test road surface, which is represented by letters. For example, AA grade tires park faster on wet straight roads than C-grade tires. Note: The traction test was conducted in a government maintained concrete asphalt test track, where the specific humidity simulated the conditions of the vast majority of road surfaces. The experiment did not measure the braking performance of dry road surfaces or the traction force during sharp turns under any other conditions. The traction level includes AA A、B、C， Among them, AA level is the highest.
