Pneumatic tire with belt layer overlapping folded portion of carcass

Abstract

A pneumatic tire, includes at least one carcass ply having a steel cord arranged substantially in a radial direction of the tire, folded turned up around a bead cord, a belt layer arranged on an outer side of a crown portion of the carcass ply to have an overlapping portion with the folded portion of the carcass, a first reinforcing rubber layer arranged between body portion of the carcass ply and the folded portion of the carcass ply, and a second reinforcing rubber layer arranged inside the body portion of the carcass ply, over a region corresponding to a tire shoulder portion to a bead portion, with its thickness gradually reduced from a central portion to opposing end portions, wherein overlapping width W2 from an upper end position RF of the second reinforcing rubber layer to an end BE of the belt layer is 7% to 33% of the width BW of the belt layer; and cross sectional widths G1W, G2W, and G3W representing minimum widths between an inner surface of the tire and respective side-wall outer surface positions G1, G2 and G3 at portions of 1/4GL to 3/4GL corresponding to cross sectional height GL from an upper end of a bead wire to a tire outer peripheral end divided equally by 4 satisfy the following relations: G3W/G1W=0.85 to 0.95, and G2W/G1W=1.0 to 1.05.

Dependencies are inferred from the claim text.