What is the national regulation on tire wear limit in millimeters?

2 Answers
SanEmmanuel
07/25/25 7:44am
Each brand and type of tire has different wear limits depending on its size. Every tire has a wear limit indicator. When the tread wears down to this limit indicator, the tire must be replaced. Symptoms of tire aging: The main symptom of tire aging is surface hardening, followed by the appearance of cracks. Aged tires lose their elasticity, and continued use can lead to tread deformation, increasing the risk of a blowout. Tire wear indicators: All tire brands have a wear indicator at the bottom of the tread grooves. For passenger car tires, the wear indicator height is generally 1.6 millimeters. When the tread wears down to less than 1.6 millimeters, the tire should be replaced.
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LaAdelyn
08/10/25 6:40pm
Recently driving more, I've been paying special attention to tire wear. National regulations state that the tire wear limit is when the tread depth decreases to 1.6mm - going below this value is illegal. I personally use the coin method to check: inserting a one-yuan coin into the tread grooves - if I can see the pattern above the coin, it means it's time for replacement. Safety is truly important - heavily worn tires are prone to skidding in rainy conditions with weaker grip, increasing accident risks. I once experienced minor skidding myself, and since then I check at least monthly. I recommend not waiting until reaching the limit - having mechanics measure during routine maintenance is more convenient. Timely replacement not only avoids fines but also protects your beloved car and pedestrians' safety - after all, nobody wants accidents on highways. These regulations are based on extensive testing - reasonable and humane.
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