| 摘要 |
<p>A pneumatic tyre with an improved tread portion having reduced pass-by noise with improved wet performances, wherein a central region Y1 of the tread between a pair of first circumferential lines X1 is provided with a wide circumferential groove (M) having a width W1 of from 0.05 to 0.15 times the ground contacting width TW; a pair of middle regions Y2 between the first circumferential lines X1 and second circumferential lines X2 and a pair of shoulder regions Y3 axially outward of the second circumferential lines X2 have no circumferential groove but axial grooves (G), the axial grooves (G) extending from the central region Y1 to the tread edges (E) and intersect the first circumferential lines X1 at an angleθ1 of from 10 to 25 degrees and the second circumferential lines X2 at an angleθ2 of from 30 to 45 degrees; and each first circumferential line X1 on each side of the tyre equator (C) is at an axial distance L1 of 0.1 to 0.15 times the width TW, and each second circumferential lines X2 on each side of the tyre equator (C) is at an axial distance L2 of from 0.325 to 0.375 times the width TW. <IMAGE></p> |
