Pneumatic tire

A pneumatic tire comprising:

• a tread portion being provided with a shoulder block row comprising a plurality of circumferentially arranged shoulder blocks on at least one side of tread edges;
• the shoulder blocks comprising a first shoulder block and a second shoulder block alternately arranged in a circumferential direction of the tire;
• the first shoulder block comprising a first edge defining an axially outermost ground contact edge of its ground contact surface;
• and
• the second shoulder block comprising a second edge defining an axially outermost ground contact edge of its ground contact surface, the second edge being located axially inwardly of the first edge,
• wherein:
• the tire further comprises a buttress surface which is a radially outward region of a sidewall portion,
• in a tire meridian cross-sectional view including a tire rotational axis under a standard condition such that the tire is mounted on a standard wheel rim with a standard pressure, but is loaded with no tire load, the buttress surface is provided with a plurality of circumferentially arranged projections protruding axially outwardly,
• the projections comprise a first projection having an outer surface that faces axially outwardly with a circumferential width decreasing smoothly toward radially inwardly,
• the second shoulder block comprises a side surface extending radially inwardly and axially outwardly from the second edge to the outer surface of the first projection with a concave shape over an entire length of the side surface,
• the first projection is connected to the second edge through the side surface of the second shoulder block,
• the projections further comprise a second projection having a circumferential width increasing smoothly toward radially inwardly,
• the first projection and the second projection are arranged alternately in the circumferential direction of the tire,
• a radially inner portion of the second projection is separated into two,
• the inner portion of the second projection comprises a pair of circumferentially end portions arranged on both end sides in the circumferential direction of the tire and a middle portion arranged between the end portions, and
• a circumferential width of the middle portion is in a range of from 30% to 50% of a circumferential maximum width of the second projection.

A pneumatic tire comprising:

• a tread portion being provided with a shoulder block row comprising a plurality of circumferentially arranged shoulder blocks on at least one side of tread edges;
• the shoulder blocks comprising a first shoulder block and a second shoulder block alternately arranged in a circumferential direction of the tire;
• the first shoulder block comprising a first edge defining an axially outermost ground contact edge of its ground contact surface;
• and
• the second shoulder block comprising a second edge defining an axially outermost ground contact edge of its ground contact surface, the second edge being located axially inwardly of the first edge,
• wherein:
• the tire further comprises a buttress surface which is a radially outward region of a sidewall portion,
• in a tire meridian cross-sectional view including a tire rotational axis under a standard condition such that the tire is mounted on a standard wheel rim with a standard pressure, but is loaded with no tire load, the buttress surface is provided with a plurality of circumferentially arranged projections protruding axially outwardly,
• the projections comprise a first projection having an outer surface that faces axially outwardly with a circumferential width decreasing smoothly toward radially inwardly,
• the second shoulder block comprises a side surface extending radially inwardly and axially outwardly from the second edge to the outer surface of the first projection with a concave shape over an entire length of the side surface,
• the first projection is connected to the second edge through the side surface of the second shoulder block,
• the projections further comprise a second projection having a circumferential width increasing smoothly toward radially inwardly,
• the first projection and the second projection are arranged alternately in the circumferential direction of the tire,
• a radially inner portion of the second projection is separated into two,
• the second projection protrudes from a base portion of the buttress surface,
• the inner portion of the second projections comprises a pair of circumferentially end portions arranged on both end sides in the circumferential direction of the tire and a middle portion arranged between the end portions, and
• the middle portion is connected to the base portion at a steeper angle than the end portions.