Heavy duty tire and production method for heavy duty tire

A heavy duty tire comprising a pair of beads and a carcass extending on and between a first bead and a second bead out of the pair of beads, wherein

• each of the beads includes a core and an apex located radially outward of the core,
• the carcass includes a carcass ply,
• the carcass ply includes a large number of carcass cords aligned with each other,
• each of the carcass cords is a steel cord,
• in a meridian cross-section of the tire, a contour of the carcass includes an outwardly bulging curved portion and an inwardly recessed inversely curved portion located radially inward of the curved portion,
• the inversely curved portion is connected to the curved portion,
• a boundary between the curved portion and the inversely curved portion is an inflection point,
• a part or an entirety of the curved portion is represented by a first arc including the inflection point,
• a part or an entirety of the inversely curved portion is represented by a second arc including the inflection point,
• the first arc and the second arc are tangent to each other at the inflection point,
• a ratio of a distance in an axial direction from an equator plane of the tire to the inflection point to a distance in the axial direction from the equator plane to an axially outer end of the contour of the carcass is not less than 70% and not greater than 85%,
• a ratio of a distance in a radial direction from a bead base line of the tire to the inflection point to a distance in the radial direction from the bead base line to a point of intersection of the contour of the carcass and the equator plane is not less than 15% and not greater than 22%,
• the apex includes an inner apex and an outer apex located radially outward of the inner apex,
• the inner apex has an outer end tapered outward in the radial direction,
• the carcass ply has a ply body which extends between the cores of the beads, and a pair of turned-up portions which are connected to the ply body and turned up around the respective cores from the inner side toward the outer side in the axial direction,
• the inflection point is located, in the axial direction, between a radially outer end of the core and the outer end of the inner apex, and the inflection point is located, in the radial direction, between an end of the turned-up portion and the outer end of the inner apex, and
• a normal line being normal to an interface between the ply body of the carcass and the apex and passing through the inflection point, intersects the turned-up portion.