| 摘要 |
<p>A pneumatic tyre having a tread portion (2) provided with a pair of circumferentially extending main grooves (G) one on each side of the tyre equator (C) to define an axially outermost circumferentially extending part (SH) between each main groove and each tread edge (E), each said axially outermost circumferentially extending part (SH) being provided with lateral grooves (gs) extending from the adjacent main groove (G) to the adjacent tread edge (E) to provide a row of circumferentially spaced shoulder blocks (BS) which have at least two different circumferential lengths, characterised in that a first quotient (Lmax/Lmin) of the maximum (Lmax) of the circumferential lengths divided by the minimum (Lmin) thereof is in the range of 1.25 to 2.00, the width (W) of each main groove (G) changes in the circumferential direction of the tyre such that the larger the circumferential length of the shoulder block the larger the width of the main groove part adjacent to the respective block and a second quotient (Wmax/Wmin) of the maximum (Wmax) of the main groove width divided by the minimum (Wmin) which is in the range of 1.1 to the first quotient (Lmax/Lmin). <IMAGE></p> |
