In-tire tread depth indicator - GIF

In-tire tread depth indicator.

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Previously:

Slicing out a tire tread pattern - GIF
Tire tread stacking machine - GIF
Tire tread wear indicator - photo

Those numbers should be in each of the 5 tread bands to be valid. The center band most always has the deepest tread due to under inflation. If they are not correct, they are typically low. VERY SELDOM is a tire over inflated.