| 摘要 |
PROBLEM TO BE SOLVED: To provide a tire that can suppress an increase in tire manufacturing cost and suppress occurence of circumferential crack in the vicinity of a bead portion of a side wall portion.SOLUTION: A tire comprises a tread portion coming in contact with a road surface, a side wall portion and a bead portion. In the side wall portion, a joining portion where a rubber for a side constituting the side wall portion is joined to a rubber for a chafer constituting the bead portion is disposed. In the joining portion, the rubber for the side is positioned more on an outer side in the tread width direction from the rubber for the chafer. When a space between a straight line along the tire thickness direction from an end portion outside in the tire radial direction of the joining portion and a straight line along the tire thickness direction from an end portion inside in the tire radial direction of the joining portion is defined as a joint region, the cross sectional area of the rubber for the side is larger than the cross sectional area of the rubber for the chafer, in a cross section in the tire radial direction and in the tread width direction of the joint region. |
