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The deeper the pattern, the greater the elastic deformation of the pattern block grounding, and the rolling resistance caused by the tire elastic hysteresis loss will also increase. Deep pattern is not conducive to heat dissipation of tire, which accelerates the rise of tire temperature. The root of pattern is easy to tear and fall off due to severe stress. The shallow pattern not only affects its water storage and drainage capacity, but also causes harmful "water skiing phenomenon", and highlights the shortcomings of smooth tread tire skidding, thus deteriorating the performance of the automobiles mentioned above.

Therefore, too deep or too shallow patterns are not good. The objective rule is that the pattern will become smaller and smaller in use. In order to ensure the validity of tread pattern effect, various countries in the world have formulated clear regulations on the wear limit of tread pattern. The warning mark "TWI" or "TWI" in English is engraved at some equivalents along the circumference of tire shoulder. When the wear distance of the bump is about 1.6 mm (1/16 inch) to the bottom of the groove, the pattern at the mark has been ground down, thus revealing a narrow horizontal strip of smooth tread, thus warning the driver that the tire has to be replaced.