Pneumatic tire

A pneumatic tire comprising:

• a tread portion provided with a pair of circumferentially and continuously extending crown main grooves arranged such that a tire equator is located therebetween, a pair of circumferentially and continuously shoulder main grooves arranged such that the crown main grooves are located therebetween, a crown land portion disposed between the crown main grooves, a pair of middle land portions each disposed between adjacent one of the crown main grooves and one of the shoulder main grooves on each side of the tire equator, and a pair of shoulder land portions disposed axially outward of the shoulder main grooves, wherein the tread portion comprises a first tread-half region from the tire equator to a first tread edge;
• in the first tread-half region, the crown land portion and the middle land portion being not provided with any grooves having widths equal to or more than 2 mm;
• in the first tread-half region, the crown land portion, the middle land portion and the shoulder land portion being respectively provided with a first crown sipe, a first middle sipe and a first shoulder sipe each having a width less than 2 mm;
• and
• the first crown sipe, the first middle sipe and the first shoulder sipe respectively configured as arc shapes having radiuses R1, R2 and R3 of curvature to protrude in a first circumferential direction side, wherein the radiuses R1, R2 and R3 are satisfied the following relation:
• R1<=R2<=R3, and R1<R3.