Patent ID: 6883567

Claim:
A pneumatic tire comprising, a mark portion provided on a portion of a tread surface of said tire and disposed apart and in isolation from a main groove extending circumferentially about said tire, wherein said mark portion includes a first cavity and a second cavity, each one of the first and second cavities extending into a depth direction of the tread surface, wherein said first cavity has a first surface shape defining a first surface area that continuously changes as a depth of the tread surface decreases due to wear and said second cavity has a second surface shape defining a second surface area that remains constant as the depth of the tread surface decreases due to wear, the isolated first cavity having substantially the same depth as the isolated second cavity and being closely placed on the tread surface next to the isolated second cavity so as to define a wear indicator such that wear amount of the tread surface can be determined using a ratio of image data of the isolated second cavity and image data of the isolated first cavity.