Abstract: A tire 22 includes a pair of bead portions 66 to be fitted to a rim R. Each bead portion 66 includes a bead 30 having a core 52 and an apex 54. An outer surface 68 of the bead portion 66 includes a seat face 70 and a flange face 72 disposed radially inward and axially outward, respectively, of the bead 30, a heel face 74 disposed between the seat face 70 and the flange face 72, and a plurality of vent lines 78 projecting from the heel face 74 and extending in the circumferential direction. A contour of the heel face 74 is represented by an arc on a cross-section, of the tire 22, taken along a plane including a rotation axis of the tire 22, and a radius Rh of the arc is not less than 8 mm and not greater than 15 mm.

Abstract: A tire 22 includes a pair of bead portions 66 to be fitted to a rim R. Each bead portion 66 includes a bead 30 having a core 52 and an apex 54. An outer surface 68 of the bead portion 66 includes a seat face 70 and a flange face 72 disposed radially inward and axially outward, respectively, of the bead 30, a heel face 74 disposed between the seat face 70 and the flange face 72, and a plurality of vent lines 78 projecting from the heel face 74 and extending in the circumferential direction. A contour of the heel face 74 is represented by an arc on a cross-section, of the tire 22, taken along a plane including a rotation axis of the tire 22, and a radius Rh of the arc is not less than 8 mm and not greater than 15 mm.

Abstract: A pneumatic tire 1 is provided in the tread portion 2 with a pair of center main grooves 3 arranged on both sides of the tire equator C, and a pair of shoulder main grooves 4 arranged on both sides thereof, and is provided on both sides of the equator C with middle land portions 6 defined between the center main grooves 3 and the shoulder main grooves 4. The middle land portions 6 are provided with a plurality of middle oblique grooves 10. Each middle oblique groove 10 extends toward the tire equator C from the outer end 10o in the tire axial direction communicating with the shoulder main groove 4, and the inner end 10i terminates without reaching to the center main groove 3. In an outer end 10o side of the middle oblique groove 10, an outer shallow bottom portion 12 having a depth less than the maximum depth of the middle tilted groove 10 is provided.

Abstract: A pneumatic tire 1 is provided in the tread portion 2 with a pair of center main grooves 3 arranged on both sides of the tire equator C, and a pair of shoulder main grooves 4 arranged on both sides thereof, and is provided on both sides of the equator C with middle land portions 6 defined between the center main grooves 3 and the shoulder main grooves 4. The middle land portions 6 are provided with a plurality of middle oblique grooves 10. Each middle oblique groove 10 extends toward the tire equator C from the outer end 10o in the tire axial direction communicating with the shoulder main groove 4, and the inner end 10i terminates without reaching to the center main groove 3. In an outer end 10o side of the middle oblique groove 10, an outer shallow bottom portion 12 having a depth less than the maximum depth of the middle tilted groove 10 is provided.