Pneumatic tire

A pneumatic tire having a tread portion formed from a rubber composition which includes 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 per 5 cm in the tire width direction in the tire radial cross section of the belt layer,
• 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,
• the loss tangent (0° C. tan δ) 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,
• the loss tangent (30° C. tan δ) satisfies 30° C. tan δ≥0.17 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 2-1,
• (30° C. tan δ×G)/e<0.020 formula 2-1,
• the outer diameter of the monofilament steel cord is 0.1 mm to 0.5 mm, and
• the loss tangent (30° C. tan δ), and the distance G(mm), and the complex elastic modulus (0° C. E*)(MPa) when the rubber composition constituting the surface of the tread portion is measured under the conditions of temperature:
• 0° C., initial strain:
• 5%, dynamic strain:
• ±0.25%, frequency 10 Hz, and deformation mode:
• elongation, satisfy formula 3-1
• 0.50≤(0° C. tan δ/0° C. E*)×G≥0.67 formula 3-1.

A pneumatic tire having a tread portion formed from a rubber composition which includes 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 per 5 cm in the tire width direction in the tire radial cross section of the belt layer,
• 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,
• 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,
• the loss tangent (30° C. tan δ) satisfies 30° C. tan δ≥0.17 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 2-1,
• (30° C. tan δ×G)/e<0.020 formula 2-1,
• the outer diameter of the monofilament steel cord is 0.1 mm to 0.5 mm, and
• the loss tangent (30° C. tan δ), and the distance G(mm), and the complex elastic modulus (0° C. E*)(MPa) when the rubber composition constituting the surface of the tread portion is measured under the conditions of temperature:
• 0° C., initial strain:
• 5%, dynamic strain:
• ±0.25%, frequency 10 Hz, and deformation mode:
• elongation, satisfy formula 3-1,
• 0.50≤(0° C. tan δ/0° C. E*)×G≥0.67 formula 3-1,
• and
• 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 4,
• e×r2/4×π>4.0 formula 4.

A pneumatic tire having a tread portion formed from a rubber composition which includes 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 per 5 cm in the tire width direction in the tire radial cross section of the belt layer,
• 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 steel cord,
• 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,
• the loss tangent (30° C. tan δ) satisfies 30° C. tan δ≥0.17 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,
• 0.016≤(30° C. tan δ×G)/e≤0.028 formula 2,
• the outer diameter of the monofilament steel cord is 0.1 mm to 0.5 mm, and
• the loss tangent (30° C. tan δ), and the distance G(mm), and the complex elastic modulus (0° C. E*)(MPa) when the rubber composition constituting the surface of the tread portion is measured under the conditions of temperature:
• 0° C., initial strain:
• 5%, dynamic strain:
• ±0.25%, frequency 10 Hz, and deformation mode:
• elongation, satisfy formula 3,
• (0° C. tan δ/0° C. E*)×G≥0.55 formula 3, and
• 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 4,
• e×r2/4×π>4.0 formula 4.

A pneumatic tire having a tread portion formed from a rubber composition which includes 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 per 5 cm in the tire width direction in the tire radial cross section of the belt layer,
• 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,
• the loss tangent (0° C. tan δ) 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,
• the loss tangent (30° C. tan δ) satisfies 30° C. tan δ≥0.17 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
• 0.016≤(30° C. tan δ×G)/e≤0.028 formula 2,
• the outer diameter of the monofilament steel cord is 0.1 mm to 0.5 mm, and
• the loss tangent (0° C. tan δ), and the distance G(mm), and the complex elastic modulus (0° C. E*)(MPa) when the rubber composition constituting the surface of the tread portion is measured under the conditions of temperature:
• 0° C., initial strain:
• 5%, dynamic strain:
• ±0.25%, frequency 10 Hz, and deformation mode:
• elongation, satisfy formula 3
• (0° C. tan δ/0° C. E*)×G≥0.55 formula 3.