Tire replacement standards

If the tread groove is less than 1.6mm, the tire should be replaced. The tire tread groove wear resistance indicator is exposed, indicating that the depth of the tread groove is less than 1.6 millimeters. The tire wear resistance indicator is a protrusion in the tread groove. If a tire with a remaining depth of less than 1.6 millimeters is used, there is a possibility of sudden loss of traction and braking force in rainy days, and no traction force in snowy days.  
The mileage standard is combined with road conditions of 30000 to 50000 kilometers. Asphalt flat road surface covers 50000 kilometers, while gravel rough road covers 30000 kilometers. When the mileage exceeds 30000 kilometers, the coefficient of friction of the tread is less than 50. In case of wet and slippery roads with rain, snow, or slippery conditions, the tread compression and drainage function may decrease or be lost. If the coefficient of friction is less than 15, the gravel road surface is prone to tire blowouts. The time standard is 5-8 years. Rubber will naturally age, with soft tires lasting 8 years and hard tires lasting 5 years The principle of priority and frequent replacement of load-bearing wheels and driving (manufacturing) wheels is the standard for load-bearing capacity.
Tires with a standard tread that has been punctured more than 4 times; Tires with punctured or gnawed sidewalls; Tires with tread diameter exceeding 4mm that have been punctured; A tire with a punctured shoulder. The sidewall rubber is relatively thin. If the puncture hole is large or the rubber surface is in a rough granulation state or bulging deformation, it should be replaced immediately to prevent tire blowouts.  
If any of the above standards are met, replace the tire.