Patent ID: 7334618

Claim:
A pneumatic tire comprising a tread having (1) axially spaced apart base layers each containing carbon black provided on an inside in a radial direction and (2) a cap layer which is poor in conductivity and contains silica provided on an outside in the radial direction, the tread being provided with grooves on an outer peripheral surface constituting a tread surface, thereby forming a tread pattern, wherein each base layer has a plurality of circular convex portions which are formed like a comb and extend in a circumferential direction, the circular convex portions being exposed to the tread surface in nonuse, and wherein the grooves are provided on the outer peripheral surface so that a plurality of circular land portions is formed on the outer peripheral surface, and one of the base layers with the circular convex portions is provided in each of the circular land portions, and each base layer (1) has two to five circular convex portions and (2) does not contain silica.