| 摘要 |
<p>It is an object of the invention to improve shapes of grooves formed in a center portion and a middle portion, thereby enhancing drainage performance while maintaining uneven wear resistance. In a pneumatic tire 1, a center land portion 5a between center main grooves 3, a middle land portion 5b between the center main groove 3 and a shoulder main groove 4, and a pair of shoulder land portions 5c extending on outer sides of the shoulder main groove 4 in a tire axial direction are divided from each other. The center main groove 3 includes arc groove pieces 6 which are continuously provided in a tire circumferential direction. The arc groove piece 6 includes an arc portion 7 which is curved to swell toward a tire equator C. A zigzag amplitude a1 of the center main groove 3 is in a range of 2 to 5% of a tread wi dth TW. The middle land portion 5b is provided with a middle inclined groove 9 which extends from an intersection portion K of the arc groove piece 6 toward the shoulder main groove 4. A ti p end angle ±1 of a land porti on sandwiched between the middle inclined groove 9 and the center main groove 3 is in a range of 30 to 75%. A groove width W3 of the middle inclined groove 9 is gradually reduced toward a ground-contact end Te.</p> |
