Pneumatic tire

A pneumatic tire having a tread portion with a circumferential groove and a belt layer, wherein

• the belt layer includes a monofilament steel cord as a reinforcing cord,
• the number of arrangements e (lines/5 cm) of the monofilament steel cords arranged per 5 cm in the tire width direction in the tire radial cross section of the belt layer is 50/5 cm or more;
• the distance G (mm) is 6.0 or more and 10.0 mm or less, from the surface of the land portion closest to the equatorial plane among land portions separated by the circumferential groove to the monofilament cord, and
• the loss tangent (30° C. tan δ) satisfies 30° C. tan δ≤0.11 when the rubber composition constituting the surface of the tread portion is measured under conditions of temperature:
• 30° C., initial strain:
• 5%, dynamic strain:
• ±1%, frequency:
• 10 Hz, and deformation mode:
• tensile, and satisfies formula 2
• 30° C. tan δ×G<1.0 formula 2
• the outer diameter of the monofilament steel cord is 0.1 mm to 0.5 mm,
• the number of arrangements e (lines/5 cm) of the monofilament steel cord and the outer diameter r (mm) of the monofilament cord satisfy formula 3,
• e×r2/4×π>4.0 formula 3
• the loss tangent (0° C. tan δ) is 0.5 or more when the rubber composition constituting the surface of the tread portion is measured under conditions of temperature:
• 0° C., initial strain:
• 5%, dynamic strain:
• ±0.25%, frequency:
• 10 Hz, and deformation mode:
• tensile, and the loss tangent (0° C. tan δ) and the distance G (mm) satisfy formula 5,
• 0° C. tan δ/G<0.14 formula 5.

A pneumatic tire having a tread portion with a circumferential groove and a belt layer, wherein

• the belt layer includes a monofilament steel cord as a reinforcing cord,
• the number of arrangements e (lines/5 cm) of the monofilament steel cords arranged per 5 cm in the tire width direction in the tire radial cross section of the belt layer is 50/5 cm or more,
• the distance G (mm) is 6.0 mm or more and 10.0 mm or less, from the surface of the land portion closest to the equatorial plane among land portions separated by the circumferential groove to the monofilament cord, and
• the loss tangent (30° C. tan δ) satisfies 30° C. tan δ≤0.11 when the rubber composition constituting the surface of the tread portion is measured under conditions of temperature:
• 30° C., initial strain:
• 5%, dynamic strain:
• ±1%, frequency:
• 10 Hz, and deformation mode:
• tensile, and satisfies formula 2,
• 30° C. tan δ×G<1.0 formula 2
• the outer diameter of the monofilament cord is 0.1 mm to 0.5 mm
• the number of arrangements e (lines/5 cm) of the monofilament steel cord and the outer diameter r (mm) of the monofilament steel cord satisfy formula 3,
• e×r2/4×π>4.0 formula 3
• the loss tangent (0° C. tan δ) is 0.5 or more when the rubber composition constituting the surface of the tread portion is measured under conditions of temperature:
• 0° C., initial strain:
• 5%, dynamic strain:
• ±0.25%, frequency:
• 10 Hz, and deformation mode:
• tensile.