| 摘要 |
PROBLEM TO BE SOLVED: To improve durability by relaxing stress concentration on the outer end edge of a tread rubber, and also improve steering stability. SOLUTION: The tread rubber 2G forming the outer surface of a tread part 2 is provided outside of a carcass 6. The tread rubber 2G is formed of a strip wound body 11 formed by winding a long belt-like rubber strip 10 around a tire rotary axis i while deviating its side edge. The outer end edge 2e of the tread rubber 2G forms an undulating line 12 circumferentially extending undulatedly inside and outside of a radial direction. The amplitude Wr of the undulating line 12, along the outer surface of the tread rubber 2G is set within a range of 5-20 mm, and the number of crests around a tire is set within a range of 8-32. COPYRIGHT: (C)2009,JPO&INPIT
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