Pneumatic tire

A pneumatic tire having a tread portion that includes a plurality of rib-shaped land portions formed by circumferential grooves extending continuously in the circumferential direction, wherein

• the rubber layer constituting the tread portion is formed by a rubber composition having a loss tangent (15° C. tan δ) of 0.13 or more and 0.18 or less measured under the conditions of 15° C., frequency 10 Hz, initial strain 5%, and dynamic strain rate 1%;
• the rubber composition comprises at least one rubber component selected from butadiene rubber, styrene butadiene rubber, and isoprene-based rubber,
• when the ground contact surface of the tread portion is divided by the equatorial plane, and when one ground contact area is Sa and the other is Sb, Sa>Sb;
• when the cross-sectional width of the tire is Wt (mm), the outer diameter is Dt (mm), and the volume of the space occupied by the tire is the virtual volume V (mm3), when the tire is installed on a standardized rim and the internal pressure is 250 kPa, the tire satisfies (formula 1) and (formula 2):
• 1600≤(Dt2×π/4)/Wt≤2827.4 (formula 1)
• [(V+1.5×107)/Wt]≤2.88×105 (formula 2),
• the cross-sectional width of the tire is Wt (mm) is 170 or more,
• the outer diameter Dt (mm) is less than 725,
• the cross-sectional height of the tire is Ht (mm) is 80 or less,
• oil content is less than 30 parts by mass per 100 parts by mass of the rubber component, and
• a plurality of lateral grooves extending in the tire axial direction are formed in the tread portion, and the total volume of the plurality of lateral grooves is 2.0 to 5.0% of the volume of the tread portion.

A pneumatic tire having a tread portion that includes a plurality of rib-shaped land portions formed by circumferential grooves extending continuously in the circumferential direction, wherein

• the rubber layer constituting the tread portion is formed by a rubber composition having a loss tangent (15° C. tan δ) of 0.13 or more and 0.18 or less measured under the conditions of 15° C., frequency 10 Hz, initial strain 5%, and dynamic strain rate 1%;
• the rubber composition comprises at least one rubber component selected from butadiene rubber, styrene butadiene rubber, and isoprene-based rubber,
• when the ground contact surface of the tread portion is divided by the equatorial plane, and when one ground contact area is Sa and the other is Sb, Sa>Sb and Sb/Sa<0.7;
• when the cross-sectional width of the tire is Wt (mm), the outer diameter is Dt (mm), and the volume of the space occupied by the tire is the virtual volume V (mm3), when the tire is installed on a standardized rim and the internal pressure is 250 kPa, the tire satisfies (formula 1) and (formula 2):
• 1600≤(Dt2×π/4)/Wt≤2827.4 (formula 1)
• [(V+1.5×107)/Wt]2.88×105 (formula 2), and
• oil content is less than 30 parts by mass per 100 parts by mass of the rubber component;
• and
• a plurality of lateral grooves extending in the tire axial direction are formed in the tread portion, and the total volume of the plurality of lateral grooves is 2.0 to 5.0% of the volume of the tread portion.