| 摘要 |
PROBLEM TO BE SOLVED: To enhance uniformity, abrasion resistance and durability while minimizing manufacturing cost in an automatic two-wheeled vehicle large in the falling ratio of a tread. SOLUTION: By forming at least the outermost layers 24 of the tread surfaces in the end part regions 20B of a tread 20 as spiral treads and forming the central region 20A small in falling ratio as compared with the end part regions 20B of the tread 20 as a one-round band winding tread, manufacturing cost is suppressed, the wrinkling or the like due to the squeezing at the time of molding the tire is eliminated in the tread end parts large in falling ratio and the thickness of the tread 20 is uniformized. Accordingly, uniformity improves to make no chattering occur at the time of running an actual car. Further, since the spiral tread is employed in the end part regions 20B, the abrasion resistance and durability in the end part regions 20B are enhanced. COPYRIGHT: (C)2008,JPO&INPIT
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