| 摘要 |
<p>A pneumatic tyre (1) comprises a tread portion (2) divided into at least three land portions (R) by at least two circumferential main grooves (M), and at least one of the thr'ee land portions is provided with sub-grooves (G,Y) being shallower in depth than the main grooves (M) and having a width in the range of from 0.05 to 0.60 times the width of the main grooves. The sub-grooves (G,Y) comprise axial sub-grooves (Y) extending across the land portion and a circumferential sub-groove (G) extending continuously in the circumferential direction of the tyre. The circumferential sub-groove (G) is provided in the bottom with a circumferential sipe (Sg) extending continuously in the circumferential direction of the tyre. Each of the axial sub-grooves is provided in the groove bottom on each side of the circumferential sub-groove with an axial sipe (Sy) extending along the longitudinal direction thereof. The axial sipe (Sy) has a first end (e1) on the circumferential sub-groove side and a second end (e2) on another side, the first end (e1) not intersecting the circumferential sipe (sg) and closed within the groove bottom, and the second end (e2) preferably closed within the groove bottom. <IMAGE></p> |
