A pneumatic tire comprising: a tread portion being provided with a plurality of circumferentially and continuously extending main grooves (3, 4, 5) to separate a plurality of land portions (6, 7, 8); the main grooves (3, 4, 5) comprising a first shoulder main groove, a second shoulder main groove and at least one crown main groove disposed between the first shoulder main groove and the second shoulder main groove; the land portions (6, 7, 8, 9) comprising a pair of shoulder portions (6, 7) each disposed axially outward of each first and second shoulder main groove (3, 4), a first crown portion disposed between the crown main groove and the first shoulder main groove, and a second crown portion disposed between the crown main groove and the second shoulder main groove; the first crown portion being provided with a plurality of first crown sipes having a width less than 2 mm, but the first crown portion being not provided with any grooves having a width equal to or more than 2 mm; the second crown portion being provided with a plurality of second crown sipes having a width less than 2 mm, but the second crown portion being not provided with any grooves having a width equal to or more than 2 mm; each of the first crown sipes extending from the crown main groove to the first shoulder main groove with a first inclination direction with respect to an axial direction of the tire; and each of the second crown sipes extending from the crown main groove to the second shoulder main groove with the first inclination direction with respect to an axial direction of the tire, wherein the tread portion comprises a designated install direction to a vehicle to have an outboard tread edge (To) and an inboard tread edge (Ti), and wherein the first shoulder main groove and the first crown portion are disposed on the side of the outboard tread edge (To) and the second shoulder main groove and the second crown portion are disposed on the side of the inboard tread edge (Ti), wherein the width of the first shoulder main groove is smaller than the width of the crown main groove, characterized in that a total of widths (W1, W2, W3) of the main grooves (3, 4, 5) is in a range of from 25% to 29% of a tread width, wherein the width of the first shoulder main groove is in a range of from 60% to 80% the width of the second shoulder main groove. a tread portion being provided with a plurality of circumferentially and continuously extending main grooves (3, 4, 5) to separate a plurality of land portions (6, 7, 8); the main grooves (3, 4, 5) comprising a first shoulder main groove, a second shoulder main groove and at least one crown main groove disposed between the first shoulder main groove and the second shoulder main groove; the land portions (6, 7, 8, 9) comprising a pair of shoulder portions (6, 7) each disposed axially outward of each first and second shoulder main groove (3, 4), a first crown portion disposed between the crown main groove and the first shoulder main groove, and a second crown portion disposed between the crown main groove and the second shoulder main groove; the first crown portion being provided with a plurality of first crown sipes having a width less than 2 mm, but the first crown portion being not provided with any grooves having a width equal to or more than 2 mm; the second crown portion being provided with a plurality of second crown sipes having a width less than 2 mm, but the second crown portion being not provided with any grooves having a width equal to or more than 2 mm; each of the first crown sipes extending from the crown main groove to the first shoulder main groove with a first inclination direction with respect to an axial direction of the tire; and each of the second crown sipes extending from the crown main groove to the second shoulder main groove with the first inclination direction with respect to an axial direction of the tire, wherein the tread portion comprises a designated install direction to a vehicle to have an outboard tread edge (To) and an inboard tread edge (Ti), and wherein the first shoulder main groove and the first crown portion are disposed on the side of the outboard tread edge (To) and the second shoulder main groove and the second crown portion are disposed on the side of the inboard tread edge (Ti), wherein the width of the first shoulder main groove is smaller than the width of the crown main groove, characterized in that a total of widths (W1, W2, W3) of the main grooves (3, 4, 5) is in a range of from 25% to 29% of a tread width, wherein the width of the first shoulder main groove is in a range of from 60% to 80% the width of the second shoulder main groove.