At what level of tire wear should a car tire no longer be used?

[Cayden]

When tire wear reaches the wear limit, the tire needs to be replaced. Near the boundary between the tire's tread and sidewall, you can find a small triangular mark. Following this mark into the tread groove, there is a small block, which is the wear limit indicator. Conditions requiring tire replacement: 1. Check the tire wear indicators: Regardless of the tire brand, wear indicator marks are set in the grooves of the tread. When the tread depth has worn down to the same level as the raised indicator rubber, it indicates that the tire needs to be replaced. 2. Bulging occurs: If the tread bulges, it means the local rubber has deteriorated or there is uneven pressure. At this point, the tire may explode at any time, making continued driving very dangerous, so it should be replaced promptly.