Pneumatic tire

1. A pneumatic tire disposed within a wheel housing of an automobile, comprising: a plurality of protrusions disposed at intervals in a tire circumferential direction on at least one tire side portion, extending in an elongated manner from an inner side to an outer side in a tire radial direction including a maximum tire width position, an extension direction of each of the protrusions being inclined with respect to the tire radial direction, and each of the protrusions adjacent to each other in the tire circumferential direction being disposed with an opposite orientation of an inclination with respect to the tire radial direction, and the number of protrusions disposed in the tire circumferential direction satisfies a range of not less than 10 and not more than 50; wherein:

each of the protrusions adjacent to each other in the tire circumferential direction is disposed to be symmetrical with respect to the tire radial direction;

an angle θ of the protrusions with respect to the tire radial direction with an end on an inner side in the tire radial direction as a reference point about a tire rotational direction satisfies a range of +1°≦θ≦+60°, or −60°≦0≦−1°;

a height that the protrusions protrude from a tire side portion satisfies a range of not less than 1 mm and not more than 10 mm, and a width in a lateral direction satisfies a range of not less than 0.5 mm and not more than 5 mm; and

the protrusions are formed as a row of fins divided in a longitudinal direction into a plurality of fins, with each of the fins of the row of fins overlapping in the tire circumferential direction at least with the closest fin, so that overall the row of fins extends from the inner side to the outer side in the tire radial direction including the maximum tire width position.

2. The pneumatic tire according to claim 1 , wherein the protrusions are disposed on a first tire side portion, and a plurality of recesses is disposed on a second tire side portion.

3. The pneumatic tire according to claim 2 , wherein a vehicle inner/outer orientation when mounted on a vehicle is designated, and the protrusions are disposed on the tire side portion on a vehicle inner side.

4. The pneumatic tire according to claim 1 , wherein a vehicle inner/outer orientation when mounted on a vehicle is designated, and the protrusions are disposed on the tire side portion on a vehicle inner side.

5. The pneumatic tire according to claim 1 , wherein a cross-sectional shape in the lateral direction of the protrusions has corners that are curved, and a base portion that protrudes from the tire side portion is curved.

6. The pneumatic tire according to claim 1 , wherein the protrusions are formed as S-shaped protrusions in the longitudinal direction of the protrusions.