Patent ID: 8047244

Claim:
A pneumatic tire comprising: a tread portion provided with at least one circumferential main groove extending continuously in the tire circumferential direction, wherein said circumferential main groove has a pair of groove walls, at least one of which is provided along the length thereof with radially extending fine grooves at intervals of 3.5 to 8.0 mm in the tire circumferential direction, said fine grooves each have a groove width of from 0.5 to 4.0 mm and a maximum groove depth of from 0.5 to 2.0 mm, each said fine groove is provided with a zigzag surface extending in a zigzag form in the length direction of the fine groove, and said zigzag surface is formed by at least two faces arranged in the length direction of the fine groove while inclining alternately in opposite directions so as to have a zigzag amplitude of 0.3 to 2.0 mm, wherein the bottom of the fine groove has the zigzag surface such that the zigzag surface defines at least one trough defining said maximum depth and at least one peak between the inner end and outer end of the fine groove relative to the groove wall of the circumferential main groove.