PNEUMATIC TIRE
FIG2 shows an exemplary enlarged view of a shoulder land portion 4s of the tread portion 2 of FIG1 
FIG2 shows an enlarged view of the shoulder land portion 4s. As shows in FIG2, the shoulder land portion 4s is located tire axially outward (tire widthwise outward) of the main shoulder groove 3s. The tire circumferential distance between the tire circumferentially adjacent horizontal shoulder grooves 30 and 30 is in the range of 20 to 60% of the tread width in order to improve handling stability. The tire circumferential distance between the tire circumferentially adjacent horizontal shoulder grooves means the distance between the horizontal shoulder grooves adjacent to each other in the tire circumferential direction at the tread contact edge. It corresponds to l30 in FIG2.
view
31
first portion
30
horizontal shoulder grooves horizontal shoulder groove
32
second portion
['1. A pneumatic tire, comprising a tread portion, the tread portion comprising at least three main circumferential grooves extending in a circumferential direction of the tire and at least four land portions separated by the main circumferential grooves and including shoulder land portions located on axially outermost sides of the tire, at least one of the shoulder land portions comprising horizontal shoulder grooves extending in an axis direction of the tire, each horizontal shoulder groove having, in a tread contact area, a tire axial length of 10 to 30% of a tread width and a tire circumferential distance between the adjacent horizontal shoulder grooves of 20 to 60% of the tread width, the shoulder land portions comprising a rubber composition containing, per 100 parts by mass of a rubber component therein, at least 40 parts by mass of carbon black and at least 30 parts by mass of silica.']