| 摘要 |
PROBLEM TO BE SOLVED: To prevent separation of tread due to crack generation by inclining a boundary face, which is disposed between rubber strips in a rubber-strip laminated body constituting an outermost layer of both shoulder portions, outward in the tire radial direction with respect to the tire outward direction in the tire width direction. SOLUTION: A tread 6 is formed with a plurality of rubber strip layers 11 to 14 in which a rubber strip winds spirally while jointing with side faces thereof continuously in the tire circumferential direction. In a rubber strip layer 11, the first layer counted from a carcass layer side outward in the tire radial direction, joint boundary faces between the rubber strips are made upward- sloping on the left. In a rubber strip layer 12, the second layer, joint boundary faces are made upward-sloping on the right. In a rubber strip layer 13, the third layer, joint boundary faces are made upward-sloping on the left. In a rubber strip layer 14, the fourth layer constituting both shoulder portions of the tread 6, a side of a tread shoulder end 10 in joint boundary faces between the rubber strips is inclined outward in the tire radial direction.
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