Pneumatic tire with annular sidewall concavity

A pneumatic tire comprising:

• (a) a substantially non-stretchable tread encircling a tire axis, said tread extending between two shoulder regions;
• (b) two non-stretchable bead regions for mounting the tire to a wheel;
• (c) two sidewalls, each of said sidewalls comprising a first portion extending inwardly relative to a width of the tire from one of said bead regions to a deflection region and a second portion extending outwardly relative to the width of the tire from said deflection region to a corresponding one of said shoulder regions;
• (d) a substantially non-stretchable girth-limiting configuration associated with said first portion of each of said sidewalls, encircling said tire axis and located inwardly relative to a width of the tire from said bead regions, said substantially non-stretchable girth-limiting configuration comprising an arrangement of at least one thread associated with said first portion of each of said sidewalls;
• and
• (e) a radial reinforcing structure including a plurality of radially-extending reinforcing elements associated with said first portion of each of said sidewalls and configured to limit radial flexing of said first portion of said sidewall,
• wherein said girth-limiting configuration and said radial reinforcing structure are configured such that, when the pneumatic tire is mounted on a wheel and inflated, said girth-limiting configuration limits a total circumference of a region of said first portion located inwardly relative to a width of the tire from said bead regions, thereby preventing outwards inversion of said first portion of each of said sidewalls so as to maintain an annular concavity between said bead region and said shoulder region.