Under what circumstances must tires be replaced?

[LeVanessa]

Tire replacement is necessary under the following circumstances: 1. The tire shows signs of aging; 2. The remaining groove depth of the tire tread reaches or falls below 1.6 millimeters; 3. The tire has bulges; 4. Frequent tire repairs. Tires are circular elastic rubber products assembled on various vehicles or machinery for ground rolling, usually mounted on metal rims. They support the vehicle body, cushion external impacts, ensure contact with the road surface, and maintain the vehicle's driving performance. Tires are used under complex and demanding conditions, enduring various deformations, loads, forces, and high and low temperatures during operation. Therefore, they must possess high load-bearing capacity, traction performance, and cushioning performance, while also requiring high wear resistance, flex resistance, and low rolling resistance and heat generation.