How deep a sidewall cut requires tire replacement?
2 Answers
Tire sidewall cuts ≥3mm are recommended for replacement. Below is detailed information about tire cuts: 1. It's necessary to check whether the cut has damaged the internal cord layer of the tire. If the sidewall is already damaged and the cord layer is affected, replacement is required. If the cut hasn't reached the cord layer, the tire can continue to be used, but regular inspection is needed to monitor whether the damage expands to the cords. If the cut extends to the cord layer position, replace the tire promptly. 2. A sidewall cut with 4mm depth must be replaced. Because the rubber thickness on tire sidewalls often doesn't exceed 1cm. Once this part is damaged, the entire tire structure becomes compromised, and the tire could potentially blow out at any time.
I'm particularly concerned about tire sidewall scratches because I've seen too many traffic accidents caused by them. Depth is the key—if the scratch is deeper than 1.5mm or you can directly see the tire's inner cord layer, you must replace the tire immediately. The sidewall is the weakest part of a tire, and a blowout at high speed can have unimaginable consequences. A simple way to check is to use your fingernail to gauge the depth; if it's deeper than your nail's thickness, it's a major red flag. Don't skimp on this expense—safety is paramount. My advice is to inspect your tires every six months to ensure there's no damage. Before long trips, take an extra careful look. The cost of replacing a tire might be significant, but it's nothing compared to the value of life and safety.
