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.