And a method of manufacturing the pneumatic tire for a motorcycle

摘要

PPROBLEM 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. PSOLUTION: By constituting the end part regions 20B of the tread 20 of two layers and forming at least the outermost layers 24 of the end part regions 20B as spiral treads, a manufacturing time (the time of winding a rubber strip 22) is made short as compared with that the spiral tread is formed over the whole width of the tread 20, a production cost can be suppressed, the wrinkling or the like due to the squeezing at the time of molding of the tire is eliminated in a tread end parts large in falling ratio and tread thickness is uniformized. Accordingly, uniformity improves to make no chattering occur at the time of an actual can. Further, by employing the spiral tread in the end part regions 20B, the abrasion resistance and durability in the end part regions 20B are enhanced. PCOPYRIGHT: (C)2008,JPO&INPIT