Rubber tire with wear indicator therein

A rubber tire, comprising a wear indicator in the general form of the letter K disposed within the tread of said tire, the vertical back of said letter being located at a region such as to indicate, on becoming visible as the result of wear of said tire that said tire is dangerously worn, the two diagonal arms of said letter being disposed for forming a triangle with the road-contact surface of said tire, said vertical back and the space between said arms including a colored component visually distinguishable from the remainder of the tread of said tire, whereby the length of the exposed side of said triangle at said surface of said tire serves as a quantitative measure of the remaining tread in said tire until the back of said letter becomes exposed.