Tire
A tire includes a pair of bead cores, a carcass layer extended across the bead cores, a belt layer disposed on an outer side of the carcass layer in a radial direction, and a tread portion. The tire outer diameter OD (mm) is in a range 200≤OD≤660. The total tire width SW (mm) is in a range 100≤SW≤400. A groove area ratio Aa (%) of the tread portion is in a range 0.008≤Aa/OD≤0.150. When a region of 48×(OD/SW){circumflex over ( )}(1/5) (%) from a maximum ground contact width end portion on a tire inner side when the tire is mounted on a vehicle is defined as a tire inner region of the tread portion, a groove area ratio Ai (%) of the tire inner region and a groove area ratio Ao (%) of a tire outer region as a region other than the tire inner region have a relationship Ai<Ao.
1 . A tire, comprising:
a pair of bead cores;
a carcass layer extended across the bead cores;
a belt layer disposed on an outer side of the carcass layer in a radial direction; and
a tread portion;
a tire outer diameter OD (mm) being in a range 200≤OD≤660,
a total tire width SW (mm) being in a range 100≤SW≤400,
a groove area ratio Aa (%) of the tread portion being in a range 0.008≤Aa/OD≤0.150,
when a region of 48×(OD/SW){circumflex over ( )}(1/5) (%) from a maximum ground contact width end portion on a tire inner side when the tire is mounted on a vehicle is defined as a tire inner region of the tread portion, a groove area ratio Ai (%) of the tire inner region and a groove area ratio Ao (%) of a tire outer region as a region other than the tire inner region have a relationship Ai<Ao, and
an average pitch number Po (piece) (Po is a natural number) within a tire ground contact length in the tire outer region satisfying OD/200≤Po≤OD/50 with respect to the tire outer diameter OD.
2 . The tire according to claim 1 , wherein
a groove area ratio Ai30 in a region from a ground contact edge on a tire inner side of the tread portion to 30% of a ground contact width is in a range 0≤Ai30≤40, and
a groove area ratio Ao30 in a region from a ground contact edge on a tire outer side of the tread portion to 30% of a ground contact width is in a range 5≤Ao30≤50.
3 . The tire according to claim 2 , wherein a ratio Ai30/Ao30 of the groove area ratio Ai30 to the groove area ratio Ao30 is in a range 0.1≤Ai30/Ao30≤1.
4 . The tire according to claim 3 , wherein a maximum groove depth Gmax (mm) of the entire tread portion satisfies 0.006≤Gmax/OD≤0.083.
5 . The tire according to claim 4 , wherein a ratio Ai/Ao of the groove area ratio Ai to the groove area ratio Ao satisfies 0.05×(OD/650)<Ai/Ao<1.
6 . The tire according to claim 5 , wherein a ratio Gi/Go of a maximum groove depth Gi (mm) of the tire inner region to a maximum groove depth Go (mm) of the tire outer region satisfies 0.4≤Gi/Go≤1.6.
7 . The tire according to claim 6 , wherein a ratio Pi/Po between an average pitch number Pi (piece) within a tire ground contact length in the tire inner region and an average pitch number Po (piece) in the tire ground contact length in the tire outer region satisfies 0.7≤Pi/Po≤1.5.
8 . The tire according to claim 1 , wherein a maximum groove depth Gmax (mm) of the entire tread portion satisfies 0.006≤Gmax/OD≤0.083.
9 . The tire according to claim 1 , wherein a ratio Ai/Ao of the groove area ratio Ai to the groove area ratio Ao satisfies 0.05×(OD/650)<Ai/Ao<1.
10 . The tire according to claim 1 , wherein a ratio Gi/Go of a maximum groove depth Gi (mm) of the tire inner region to a maximum groove depth Go (mm) of the tire outer region satisfies 0.4≤Gi/Go≤1.6.
11 . The tire according to claim 1 , wherein
the tread portion has a circumferential main groove extending in a tire circumferential direction,
the circumferential main groove has a groove width of 3 mm or more, and
a projected area C (mm 2 ) of the circumferential main groove satisfies 0.03≤C/(SW×OD)≤1.01.
12 . The tire according to claim 1 , wherein a ratio Pi/Po between an average pitch number Pi (piece) within a tire ground contact length in the tire inner region and an average pitch number Po (piece) in the tire ground contact length in the tire outer region satisfies 0.7≤Pi/Po≤1.5.
13 . A tire, comprising:
a pair of bead cores;
a carcass layer extended across the bead cores;
a belt layer disposed on an outer side of the carcass layer in a radial direction; and
a tread portion;
a tire outer diameter OD (mm) being in a range 200≤OD≤660,
a total tire width SW (mm) being in a range 100≤SW≤400,
a groove area ratio Aa (%) of the tread portion being in a range 0.008≤Aa/OD≤0.150, and
when a region of 48×(OD/SW){circumflex over ( )}(1/5) (%) from a maximum ground contact width end portion on a tire inner side when the tire is mounted on a vehicle is defined as a tire inner region of the tread portion, a groove area ratio Ai (%) of the tire inner region and a groove area ratio Ao (%) of a tire outer region as a region other than the tire inner region have a relationship Ai<Ao; wherein
a groove area ratio Ai30 in a region from a ground contact edge on a tire inner side of the tread portion to 30% of a ground contact width is in a range 0≤Ai30≤40,
a groove area ratio Ao30 in a region from a ground contact edge on a tire outer side of the tread portion to 30% of a ground contact width is in a range 5≤Ao30≤50,
a ratio Ai30/Ao30 of the groove area ratio Ai30 to the groove area ratio Ao30 is in a range 0.1≤Ai30/Ao30≤1,
a maximum groove depth Gmax (mm) of the entire tread portion satisfies 0.006≤Gmax/OD≤0.083,
a ratio Ai/Ao of the groove area ratio Ai to the groove area ratio Ao satisfies 0.05×(OD/650)<Ai/Ao<1,
a ratio Gi/Go of a maximum groove depth Gi (mm) of the tire inner region to a maximum groove depth Go (mm) of the tire outer region satisfies 0.4≤Gi/Go≤1.6,
the tread portion has a circumferential main groove extending in a tire circumferential direction,
the circumferential main groove has a groove width of 3 mm or more,
a projected area C (mm 2 ) of the circumferential main groove satisfies 0.03≤C/(SW×OD)≤1.01, and
an average pitch number Po (piece) (Po is a natural number) within a tire ground contact length in the tire outer region satisfies OD/200≤Po≤OD/50 with respect to the tire outer diameter OD.