| 摘要 |
A pneumatic tyre has a tread part (T) with two wide circumferential grooves (7) one either side of the tyre's equator so as to divide the tread part (T) into a pair of shoulder parts (8) and a central part (9). The central part (9) has a surface formed of successive convex curves of a pair of inner groove walls (9A) and a central ground-contacting surface (9B). The central ground-contacting surface (9B) is substantially in contact with a virtual tread line (10) between outer surfaces of the shoulder parts (8). The circumferential groove (7) has an outer groove wall (12) extending along a curve composed of at least two arc sections from the outer bottom edges, and smoothly connecting to the outer surface of the shoulder part (8). The groove width GW of the circumferential groove (7) measured at a radial position (P) above the groove bottom by a distance of 2/3 times the groove depth D and GW is not less than 35 mm and not more than 0.35 times the ground-contacting width TW of the tread. <IMAGE> |
