At what level of wear should car tires no longer be used?

[KiraDella]

Car tires must be discontinued when they reach the wear limit indicator, at which point the tread depth is typically 1.6mm. Regulations regarding wear limits: The United States stipulates that the wear limit for car tires is a tread groove depth of no less than 1.0mm; China's national standard specifies that the wear limit for radial tires used in passenger cars is 1.6mm, while for trucks and buses, it is 2.0mm. Precautions for tire use: Damages to tires include tread cracks, tread bulges, missing tread rubber, severe or abnormal wear on the tire sidewalls, etc. If such conditions occur, the tires should be replaced even if they have not reached the wear limit depth.