Pneumatic tire

A pneumatic tire comprising:

• a tread portion,
• a pair of sidewall portions,
• a pair of bead portions each with a bead core therein,
• a carcass ply made of cords extending between the bead portions and turned up around the bead cores from the axially inside to the outside of the tire to form a turnup portion in each said bead portion and a main portion there between,
• a bead apex disposed between said main portion and the turnup portion in each said bead portion and tapering radially outwardly from the bead core to its radially outer end,
• at least one pair of an axially outer cord layer and an axially inner cord layer each extending radially outwardly from each bead portion,
• said axially outer cord layer terminating at a radial height not more than 50% of the section height of the tire,
• said axially inner cord layer extending radially outwardly beyond the radially outer end of said axially outer cord layer,
• a cord spacing between said axially outer cord layer and said axially inner cord layer decreasing radially inwardly from the radially outer end of the axially outer cord layer so that a minimum value (tmin) thereof is in the range of from 0.15 to 7.0 times the diameter of the carcass cords,
• said axially outer cord layer being the turnup portion of the carcass ply,
• the turnup portion sandwiched between an axially inner insulation rubber and an axially outer insulation rubber,
• each of the axially inner insulation rubber and axially outer insulation rubber having a 100% modulus higher than that of a sidewall rubber disposed axially outside the axially outer insulation rubber, and
• the 100% modulus of the axially outer insulation rubber being higher than the 100% modulus of the axially inner insulation rubber.