An air maintenance tire system and method in accordance with the present invention includes an air pumping mechanism configured to maintain air pressure within a first tire and a second tire in a dual tire arrangement. The system includes a control valve assembly attached to an elongate valve stem projecting from a rim of a first tandem tire, and a one-way valve carrying connecting tube from a sidewall air pumping passageway within a sidewall of the first tire. The control valve assembly further includes first and second outlet tubes connected to the elongate valve stem to selectively pass pressurized air into the tire cavities of both tandem mounted tires on an as-needed basis.

When a pneumatic tire is in a reference state of being fitted with a rim that is one inch larger than a regular rim in width, of holding 15 kPa internal pressure, and of being under no load, then a tread thickness distribution curve represented by f(y)=1t(y)/t(0) is 0.01 to 0.03 when y=0.3; 0.03 to 0.06 when y=0.4; and 0.06 to 0.10 when y=0.5, where y denotes a ratio of a distance in an axial direction from an equator surface relative to a distance L in the axial direction between the equator surface and a maximum width position of a carcass, and t(y) denotes a tread thickness corresponding to a distance in a radial direction between an outer surface of the carcass and an outer surface of a tread at an axial direction position corresponding to y.

When a pneumatic tire is in a reference state of being fitted with a rim that is one inch larger than a regular rim in width, of holding 15 kPa internal pressure, and of being under no load, then a tread thickness distribution curve represented by f(y)=1t(y)/t(0) is 0.01 to 0.03 when y=0.3; 0.03 to 0.06 when y=0.4; and 0.06 to 0.10 when y=0.5, where y denotes a ratio of a distance in an axial direction from an equator surface relative to a distance L in the axial direction between the equator surface and a maximum width position of a carcass, and t(y) denotes a tread thickness corresponding to a distance in a radial direction between an outer surface of the carcass and an outer surface of a tread at an axial direction position corresponding to y.

A run-flat tire includes a carcass including at least one carcass ply, a belt layer, a pair of side reinforcing rubber layers, a pair of bead apex rubber components. A height of the one bead apex rubber component is greater than a height of the other bead apex rubber component. An inner end height of the one side reinforcing rubber layer is greater than an inner end height of the other side reinforcing rubber layer. In a radial region of the tire where at least the bead apex rubber components and the side reinforcing rubber layers are provided, the tire has a same thickness in the respective sides of the bead portions.

A run-flat tire includes a carcass including at least one carcass ply, a belt layer, a pair of side reinforcing rubber layers, a pair of bead apex rubber components. A height of the one bead apex rubber component is greater than a height of the other bead apex rubber component. An inner end height of the one side reinforcing rubber layer is greater than an inner end height of the other side reinforcing rubber layer. In a radial region of the tire where at least the bead apex rubber components and the side reinforcing rubber layers are provided, the tire has a same thickness in the respective sides of the bead portions.

A tire (10) comprises a crown (12) comprising a tread (20), a crown reinforcement (14), two sidewalls (22), two beads (24), with each sidewall (22) connecting each bead (24) to the crown (12), the crown reinforcement (14) extending into the crown (12). The tire (10) comprises a radial carcass reinforcement (32) anchored in each of the beads (24) and extending into the sidewalls (22), and the crown reinforcement (14) is radially inserted between the carcass reinforcement (32) and the tread (20). The tire (10) has a sidewall height that is greater than or equal to 110 mm and a load index that is greater than or equal to 94. The carcass reinforcement (32) comprises a single carcass ply (34) comprising at least one reinforcer element comprising an assembly formed by: a multifilament strand made of aromatic polyamide or aromatic co-polyamide; and a multifilament strand made of polyester.

A tire (10) comprises a crown (12) comprising a tread (20), a crown reinforcement (14), two sidewalls (22), two beads (24), with each sidewall (22) connecting each bead (24) to the crown (12), the crown reinforcement (14) extending into the crown (12). The tire (10) comprises a radial carcass reinforcement (32) anchored in each of the beads (24) and extending into the sidewalls (22), and the crown reinforcement (14) is radially inserted between the carcass reinforcement (32) and the tread (20). The tire (10) has a sidewall height that is greater than or equal to 110 mm and a load index that is greater than or equal to 94. The carcass reinforcement (32) comprises a single carcass ply (34) comprising at least one reinforcer element comprising an assembly formed by: a multifilament strand made of aromatic polyamide or aromatic co-polyamide; and a multifilament strand made of polyester.

In this tire, a distance GT from a tire outer surface profile at a tire ground contact edge to a tire inner surface, a distance GC from the tire outer surface profile at a position of 70% of a tire cross-sectional height to the tire inner surface, and a distance GD from the tire outer surface profile at a tire maximum width position to the tire inner surface satisfy conditions 1.00GC/GD1.10 and 3.00GT/GC4.00.