To what extent must sidewall cracks on tires be replaced?

[WilliamLee]

Here are the situations where sidewall cracks on tires require replacement: Cracks less than 6mm in length: If cracks appear on the tire, the depth of the cracks should be assessed. Cracks less than 6mm in length can be repaired at a maintenance shop. Otherwise, the tire needs to be replaced because damage to internal materials cannot be repaired. If the repaired tire is on the front wheel, it is recommended to swap it with an unrepaired rear wheel to minimize the risk of a blowout. In remote areas where maintenance shops are not nearby, if cracks appear on the tire, it is safest to replace it with a spare tire. Numerous small cracks: If the tire shows signs of aging, with numerous small cracks at the base of the tread grooves or on the sidewall that are about to damage the tire body, the tire should be replaced immediately, regardless of how long it has been used or how much it has worn.