Pneumatic tire including two grooves and two rubber parts

摘要

A pneumatic tire has a tread part with two circumferential grooves continuously extending in the circumferential direction in either side of the tire's equator so as to divide the tread part into a pair of shoulder parts and a central part. The central part has a surface utilizing successive convex curves composed of a pair of inner groove walls, which extend inside in the axial direction of tire along a curve convexed outwardly in the radial direction from inner bottom edges of the circumferential grooves, and a central ground-contact surface, which is smoothly connected between the pair of the inner groove walls. The central ground-contact surface is substantially in contact with a virtual tread line connected between outer surfaces of the shoulder parts.