Tire

A tire comprising a tread portion which has a tread surface and is provided with a lateral groove extending in a tire axial direction, wherein

• in a cross section of the lateral groove perpendicular to the longitudinal direction of the lateral groove, the lateral groove has a minimum portion at which the groove width is smallest and which is located radially inside the tread surface, and a maximum portion at which the groove width is locally largest and which is located radially inside the minimum portion,
• at least one of groove walls of the lateral groove comprises, between the tread surface and the minimum portion, an inclined surface which is inclined radially inwardly toward the inside of the lateral groove,
• in a plan view of the tread portion, a length in the groove width direction of the inclined surface is increased toward an outside in the tire axial direction,
• in the tread surface, the lateral groove has an opening at an outermost portion of the lateral groove in a tire radial direction, of which width increases toward an outside in the tire axial direction,
• the lateral groove has, between the opening and the minimum portion, an inclined surface inclined with respect to the radial direction of the tire, and the inclined surface is a twisted surface,
• a length in the groove width direction of the inclined surface measured at an axially inner end of the inclined surface is 30% to 70% of a length in the groove width direction of the inclined surface measured at an axially outer end of the inclined surface, and
• a width of the opening at an axially inner end of the lateral groove in the tire axial direction is 40% or more and 70% or less of a width of the opening at an axially outer end of the lateral groove in the tire axial direction.

A tire comprising:

• a tread portion having a tread surface and provided with a lateral groove extending in a tire axial direction,
• the lateral groove having a radially innermost groove bottom, a pair of opposite groove walls, and an opening opened at the tread surface, between radially outer ends of the opposite groove walls, wherein
• in a cross section of the lateral groove perpendicular to a longitudinal direction of the lateral groove, each of the groove walls comprises:
• an inclined surface extending from the tread surface to a first point on the groove wall, while inclining to an inside in a tire radial direction, and
• an internal inclined surface extending radially inwardly from the first point to a second point on the groove wall,
• the internal inclined surface is composed of a flat surface and a curved surface,
• the flat surface extends radially inwardly from the first point to the curved surface, while inclining with respect to the tire radial direction to an outside of the lateral groove in a widthwise direction of the lateral groove,
• the curved surface extends radially inwardly from the flat surface to the second point, while curving convexly toward the outside of the lateral groove in the widthwise direction of the lateral groove, and
• in the cross section of the lateral groove,
• a groove width between the first points on the opposite groove walls is locally minimum, and
• a groove width between the second points on the opposite groove walls is locally maximum, wherein
• a width of the opening of the lateral groove at the tread surface gradually increases toward an outside in the tire axial direction, and
• the groove width between the first points is constant in the tire axial direction.

A tire comprising:

• a tread portion having a tread surface and provided with a lateral groove extending in a tire axial direction,
• the lateral groove having a radially innermost groove bottom, a pair of opposite groove walls, and an opening opened at the tread surface, between radially outer ends of the opposite groove walls, wherein
• in a cross section of the lateral groove perpendicular to a longitudinal direction of the lateral groove, each of the groove walls comprises:
• an inclined surface extending from the tread surface to a first point on the groove wall, while inclining to an inside in a tire radial direction, and
• an internal inclined surface extending radially inwardly from the first point to a second point on the groove wall,
• the internal inclined surface is composed of a flat surface and a curved surface,
• the flat surface extends radially inwardly from the first point to the curved surface, while inclining with respect to the tire radial direction to an outside of the lateral groove in a widthwise direction of the lateral groove,
• the curved surface extends radially inwardly from the flat surface to the second point, while curving convexly toward the outside of the lateral groove in the widthwise direction of the lateral groove, and
• in the cross section of the lateral groove, a groove width between the first points on the opposite groove walls is locally minimum, and a groove width between the second points on the opposite groove walls is locally maximum, wherein
• a width of the opening of the lateral groove at the tread surface is constant in the tire axial direction, and
• the groove width between the first points gradually decreases toward an outside in the tire axial direction.