Patent ID: 8517071

Claim:
A pneumatic tire formed by laminating a plurality of belt plies, comprising: a belt layer arranged on an outer side of a carcass layer in a radial direction of the pneumatic tire; a belt edge cushion arranged on an edge of the belt plies; at least four circumferential main grooves in a tread of the pneumatic tire extending in the radial direction of the pneumatic tire forming and partitioning a plurality of land portions, and further comprising narrow grooves forming narrow ribs on an edge of an outer side of the land portions in a width direction of the tire and arranged on a tread shoulder area land portion; wherein the at least four circumferential main grooves comprise outer circumferential main grooves located on edge sides of a footprint of the pneumatic tire; and wherein a cross-section of the pneumatic tire in a tire meridian direction comprises: a distance t from a tire equatorial plane to the outer circumferential main grooves and a distance b from the tire equatorial plane to the edge of an inner side of the belt edge cushion in the tire width direction such that that 0.85≦t/b≦0.90 is satisfied; a width d comprising half the width of a largest width belt ply, and a distance u extending from the tire equatorial plane to the narrow grooves such that 0.97≦d/u≦1.03 is satisfied; and a width a comprising half the width of an outermost layer belt ply, and the distance t, such that 1.15≦a/t≦1.25 is satisfied.