Patent ID: 7543619

Claim:
A heavy duty tire comprising: a carcass having carcass cords which extends from a tread portion to a bead core in each of a pair of bead portions through a pair of sidewall portions, a belt layer disposed radially outward of the carcass in the tread portion, and a sidewall rubber disposed axially outward of the carcass in each of the sidewall portions and extending in the radial direction of the tire, wherein the sidewall rubber includes an axially inner rubber portion disposed axially outward of the carcass and an axially outer rubber portion disposed axially outward of the axially inner rubber portion to form a tire outer surface, the axially inner rubber portion has a lower loss tangent than that of the axially outer rubber portion by a difference of 0.010 to 0.035, and the axially inner rubber portion has a lower complex elastic modulus than that of the axially outer rubber portion by a difference of 0.5 to 1.4 MPa, wherein in each said bead portion is disposed a bead apex rubber which extends from the bead core toward radially outward of the tire in a tapered manner, and the radially outer end portion of the bead apex rubber is located between the axially inner and outer rubber portions of the sidewall rubber.