Do 5-year-old tires need to be replaced?

[LeonardoFitz]

This needs to be judged based on usage conditions. Theoretically, 5-year-old tires should be replaced. You can check tire wear conditions through the following methods. First point: If the tire shows signs of aging (for example: numerous small cracks on the tread groove bottom or sidewall that are about to damage the tire body), this tire needs to be replaced immediately, regardless of how long it has been used or how much it has worn. Second point: If the remaining groove depth of the tire tread reaches or falls below 1.6 millimeters (there are indicator marks in the longitudinal straight grooves of the tire tread indicating this depth), the tire must be replaced because its drainage capacity has significantly decreased, making driving on wet surfaces more dangerous. In addition, damaged tires should also be carefully evaluated for replacement. For example, tires that have been run flat may still be drivable when inflated, but since the internal structure may have been damaged, it is recommended to replace them with new tires promptly. It is particularly important to note that bulging tires must not continue to be used.