How deep a cut on the tire shoulder requires replacement?

[DiCameron]

Tire sidewall cuts of 4mm depth are recommended for replacement. Below is relevant information about tire shoulders: 1. Introduction: The transition area between the tread crown and sidewall. Due to the small curvature of the tread surface and large curvature of the carcass ply layer, rubber material must fill the lower sides of the tread during manufacturing, forming the shoulder area. 2. Characteristics: Shoulder thickness generally doesn't exceed 1.35-1.60 times the tread thickness. Excessively thick shoulders may cause shoulder separation or cracking. Therefore, various patterns are typically designed in this area, connecting with tread grooves for heat dissipation. For truck tires, shoulder patterns additionally bear overload pressure during turns and help improve traction.

[KatherineAnn]

I remember last time when my car's tire shoulder got a cut, I immediately went to get it checked. Generally, if the cut is deep enough to expose the steel belt or fabric layer inside, even if it's just about 1 mm, the tire should be replaced. The sidewall of a tire is very thin, and any structural damage can easily lead to a high-speed blowout. My friend's car had a small cut that was ignored, and it caused problems during a high-speed drive. I recommend using a coin to test the depth—if the cut is deeper than the edge thickness of the coin, it's dangerous. Don't take the risk and delay; tires aren't expensive, but accidents can be costly. Regularly check tire pressure and wear, and maintain periodic inspections. Safety should always come first—saving a few bucks isn't worth risking more. Stay vigilant and prioritize safety.

[JessicaDella]

I frequently drive long distances and am quite sensitive to tire scratches. Once there's a scratch on the tire shoulder, especially if it exceeds 0.8 mm in depth, resembling a small crack with exposed internal cords, it's essential to replace the tire. I once ignored a shallow scratch, only to replace it months later when a bulge appeared. Remember to check by feeling with your hand—if it feels deep or bubble-like, take immediate action. Also, consider the tire's age; older tires might need early replacement even with shallow damage. Don't just focus on depth; assess overall wear too. Replacing a tire early can save you from repair costs or bumper damage. Regular tire maintenance and avoiding gravel roads can help prevent such issues.

[SilasLynn]

If the tire shoulder is deeply scratched, it must be replaced. My recommended standard is that if the depth exceeds 2mm, or if you can see cords or deformation with the naked eye, it's time for a replacement. These areas bear significant pressure, and minor damage can escalate into major failures. A trick I've learned is to use a simple tool, like a one-yuan coin, to test the scratch depth. If the scratched area becomes soft or starts to blister, don't hesitate. Also, consider your driving habits—those who frequently drive at high speeds should be extra cautious. Timely replacement ensures stable driving. Proper tire maintenance can extend their lifespan.