At what level of tire cracks should they be replaced?

[DeAutumn]

Tire cracks require replacement under the following conditions: 1. Cracks appear on the tire sidewall; 2. Cracks are too long or deep, reaching the standard tread depth of 1.6 mm; 3. The tire shows bulging; 4. Wavy cracks on the tire surface; 5. Obvious scratches or punctures on the tire surface. The causes of tire cracks include natural aging or impacts. Precautions for using car tires are: 1. When inflating tires, reduce the tire temperature to normal levels to avoid affecting pressure judgment; 2. Inflate to around 2.5 bar; 3. Regularly check the wear level of car tires; 4. Avoid exposing tires to high temperatures.

[MacEmilia]

Having driven for over a decade, I've witnessed numerous tire crack incidents. The critical safety factor is crack depth: once the internal tire cords (white threads) become visible, the tire must be replaced immediately. Sidewall cracks are particularly hazardous as they weaken the load-bearing structure, increasing the risk of blowouts at high speeds. Even shallow cracks require evaluation if they exceed 6mm in width or extend over a large area. Tires aging beyond five years warrant special attention—use a small flashlight during routine checks to monitor crack progression. I recall that rainy highway incident when a minor sidewall crack suddenly expanded; fortunately, pulling over for timely tire replacement averted disaster. Don't wait for failure—schedule professional assessments periodically. Maintaining correct tire pressure (2.3-2.5 bar) prevents minor issues from escalating.

[Alexander]

As a car enthusiast, I often check my tires myself. The severity of cracks depends on their location: shallow tread cracks can be ignored, but sidewall cracks deeper than 3mm or wider than a coin's thickness require immediate replacement. Exposed internal tire cords are the most serious warning sign—don't hesitate. Tools like depth gauges help with measurements, and aged tires with dense cracking patterns should also be replaced. Contributing factors include UV exposure, driving underinflated, and hard braking habits. Parking in shade and monthly pressure checks extend tire life. Safety always comes first—don't risk disaster to save small money.

[NaomiLee]

Having dealt with tire issues, I believe the key to cracks lies in whether they reach the inner layers: replace the tire immediately if the cords are visible. Even small cracks on the sidewalls pose higher risks. I perform a simple visual inspection monthly and use my nail to test the depth—if it sinks in deeply, there's a problem. Cracks tend to accelerate in tires aged around five years. Don't wait until a blowout to regret it.