Pneumatic tire

A pneumatic tire comprising:

• on a tread surface, a plurality of circumferential main grooves extending in a tread circumferential direction, and a plurality of land portions, each land portion being defined between circumferential main grooves adjacent in a tread width direction among the plurality of circumferential main grooves, or by a circumferential main groove among the plurality of circumferential main grooves and a tread edge, wherein
• at least one land portion of the plurality of land portions includes a plurality of widthwise sipes extending in the tread width direction,
• at least one widthwise sipe of the plurality of widthwise sipes includes a widened portion, on a sipe bottom side, at which a sipe width is larger than on the tread surface side,
• when the pneumatic tire is mounted on an applicable rim, filled to a prescribed internal pressure, and under no load, a sipe depth of the widened portion that is farthest outward in a tire radial direction, at which the sipe width of the widened portion of the at least one widthwise sipe is 2.5 or more times an opening width of the at least one widthwise sipe at the tread surface, is designated as a reference depth position,
• in a tire radial direction region including at least the reference depth position, a storage modulus of first tread rubber is larger than a storage modulus of second tread rubber located in a region around the first tread rubber, the first tread rubber being a groove wall surface layer defined by the widened portion, and
• the first tread rubber is formed only on a groove wall surface of an entire portion of the widened portion and not on an entire groove wall surface of the at least one widthwise sipe.

A pneumatic tire comprising:

• on a tread surface, a plurality of circumferential main grooves extending in a tread circumferential direction, and a plurality of land portions, each land portion being defined between circumferential main grooves adjacent in a tread width direction among the plurality of circumferential main grooves, or by a circumferential main groove among the plurality of circumferential main grooves and a tread edge, wherein
• at least one land portion of the plurality of land portions includes a plurality of circumferential sipes extending in the tread circumferential direction,
• at least one circumferential sipe of the plurality of circumferential sipes includes a widened portion, on a sipe bottom side, at which a sipe width is larger than on the tread surface side,
• when the pneumatic tire is mounted on an applicable rim, filled to a prescribed internal pressure, and under no load, a sipe depth of the widened portion that is farthest outward in a tire radial direction, at which the sipe width of the widened portion of the at least one circumferential sipe is 2.5 or more times an opening width of the at least one circumferential sipe at the tread surface, is designated as a reference depth position,
• in a tire radial direction region including at least the reference depth position, a storage modulus of first tread rubber is larger than a storage modulus of second tread rubber located in a region around the first tread rubber, the first tread rubber being a groove wall surface layer defined by the widened portion, and
• the first tread rubber is formed only on a groove wall surface of an entire portion of the widened portion and not on an entire groove wall surface of the at least one circumferential sipe.