What is the national standard for tread depth in visual tire inspection?
3 Answers
China's national standard stipulates that the wear limit for radial tire treads on passenger cars is 1.6mm, while for trucks and buses it is 2.0mm. Tire tread depth should be inspected according to the following standards: Good: greater than 3.5mm, Suggested replacement next time: 2.5-3.5mm, Needs replacement: less than 2.5mm, Replacement limit: 1.6mm. Tires should be replaced earlier if severe aging or cracking occurs. Introduction to tires: Tires are circular elastic rubber products mounted on various vehicles or machinery that roll on the ground. Typically installed on metal rims, they support the vehicle body, cushion external impacts, maintain contact with the road surface, and ensure driving performance.
I've been driving for over a decade and remember the national standard for tire tread depth clearly - the minimum remaining depth is 1.6mm. This standard is primarily for safety considerations, as shallow treads reduce drainage performance and increase the risk of skidding in rainy conditions. You can check it with a tread depth gauge, and many repair shops offer free inspections. I also use a coin for a quick check - the tread grooves shouldn't be shallower than the 1.6mm mark. Don't underestimate this - tires with insufficient tread depth will fail annual inspections and incur fines. Last time, I had to replace a worn-out tire, costing me a few hundred yuan but it was worth it. I recommend checking your tires quarterly along with tire pressure monitoring to maintain good condition - it saves money and gives peace of mind.
In the auto repair industry, the national standard for tire tread depth is 1.6mm, which we check daily. When a customer's car comes in, we measure it with a depth gauge and recommend tire replacement if it's below this value. This isn't just for compliance, but more importantly for safety prevention - shallow treads increase braking distance in rainy conditions and can easily lead to accidents. We also check tread wear uniformity; for example, if front tires wear faster, we recommend rotation to extend tire life. Standards require clearly visible tread patterns without any cracks or bulges. I suggest owners check during every 5,000km maintenance to identify issues early. Choosing better brand tires can add two years of service life and prevent accidents during emergency braking.
