Abstract: A tire comprises a tread portion axially divided by circumferential grooves into a first middle land portion, a crown land portion and a second middle land portion. Each land portion has a profile protruding radially outwardly from a reference tread profile. The maximum protrusion amount of the second middle land portion's profile is larger than the maximum protrusion amount of the crown land portion's profile which is larger than the maximum protrusion amount of the first middle land portion's profile.

Abstract: A tire includes a tread portion. The tread portion includes a pair of shoulder main grooves and a plurality of crown blocks. Each of the crown blocks includes a ground contacting surface, a chamfered portion arranged so as to surround the entire circumference of the ground contacting surface, and a main body portion arranged inside the chamfered portion in a tire radial direction. The main body portion is provided with at least one step-shaped portion that is bent stepwise in a transverse cross section orthogonal to the ground contacting surface.

Abstract: A tire comprises a tread portion axially divided by circumferential grooves into a first middle land portion, a crown land portion and a second middle land portion. Each land portion has a profile protruding radially outwardly from a reference tread profile. The maximum protrusion amount of the second middle land portion's profile is larger than the maximum protrusion amount of the crown land portion's profile which is larger than the maximum protrusion amount of the first middle land portion's profile.

Abstract: A tire includes a tread portion. The tread portion includes a pair of shoulder main grooves and a plurality of crown blocks. Each of the crown blocks includes a ground contacting surface, a chamfered portion arranged so as to surround the entire circumference of the ground contacting surface, and a main body portion arranged inside the chamfered portion in a tire radial direction. The main body portion is provided with at least one step-shaped portion that is bent stepwise in a transverse cross section orthogonal to the ground contacting surface.

Abstract: In a tire 2 according to the present invention, an outer surface 52 of a crown rib 48e and an outer surface 54 of a shoulder rib 48s form a part of a tread surface 28. On a cross-section of the tire 2 along a plane that includes a rotation axis of the tire 2, an outline of the outer surface 52 of the crown rib 48e is represented as a first arc. A center of a circle to which the first arc belongs is disposed on the equator plane. An outline of the outer surface 54 of the shoulder rib 48s is represented as a second arc. A ratio of a distance from a center of a chord of the second arc to the second arc relative to a length of the chord of the second arc is not less than 0.03 and not greater than 0.05.

Abstract: In a tire 2 according to the present invention, an outer surface 52 of a crown rib 48e and an outer surface 54 of a shoulder rib 48s form a part of a tread surface 28. On a cross-section of the tire 2 along a plane that includes a rotation axis of the tire 2, an outline of the outer surface 52 of the crown rib 48e is represented as a first arc. A center of a circle to which the first arc belongs is disposed on the equator plane. An outline of the outer surface 54 of the shoulder rib 48s is represented as a second arc. A ratio of a distance from a center of a chord of the second arc to the second arc relative to a length of the chord of the second arc is not less than 0.03 and not greater than 0.05.