Pneumatic tire

A pneumatic tire, comprising:

• a tread portion extending in a tire circumferential direction and having an annular shape;
• a pair of sidewall portions respectively disposed on both sides of the tread portion;
• a pair of bead portions each disposed on an inner side of the pair of sidewall portions in a tire radial direction,
• one carcass layer mounted between the pair of bead portions;
• a plurality of belt layers disposed on an outer circumferential side of the carcass layer in the tread portion;
• and
• a belt reinforcing layer disposed on an outer circumferential side of the belt layer;
• the tread portion being made up of two layers, an under tread layer disposed on an outer circumferential side of the belt reinforcing layer and a cap tread layer disposed on an outer circumferential side of the under tread layer and constituting a road contact surface of the tread portion;
• a cover cord constituting the belt reinforcing layer being made of a polyethylene terephthalate fiber cord having an elongation ratio under a load of 2.0 cN/dtex at 100° C. ranging from 2.0% to 4.0%,
• an under tread rubber composition constituting the under tread layer having a hardness at 20° C. ranging from 60 to 65, a tensile stress at 100% elongation at 100° C. (M100) ranging from 2.0 MPa to 4.0 MPa, and a product (TB×EB) of a tensile strength TB (unit:
• MPa) at 100° C. and an elongation at break EB (unit:
• %) at 100° C. of 2000 or more, and
• the under tread rubber composition blending, per 100 parts by mass of rubber component, 35 parts by mass to 60 parts by mass of carbon black having a CTAB adsorption specific surface area of less than 70 m2/g and 3 parts by mass to 30 parts by mass of silica having the CTAB adsorption specific surface area of less than 180 m2/g.