When should tires be replaced regardless of tread depth?

Tires should be replaced if there are visible cracks or sidewall damage because these conditions can compromise the structural integrity of the tire, leading to potential tire failure while driving. Cracks can allow air to escape, increase the risk of blowouts, or create weak points that might rupture under pressure. Sidewall damage can also cause the tire to lose stability and grip on the road, significantly increasing the risk of accidents. Therefore, even if the tread depth is still sufficient, any noticeable physical damage or degradation, such as cracks or issues in the sidewall, is a critical indicator that the tire is no longer safe for use and should be replaced to ensure the safety of the vehicle and its occupants.