| 摘要 |
A cavity face 34 of a mold 32 has a protruding ridge P. A shape of cross section of the ridge P is almost rectangular. The ridge P has a first corner P 1 , a second corner P 2 , a third corner P 3 and a fourth corner P 4. The ridge P has a height H of 0.1 mm or greater and 1.0 mm or less. The ridge P has a width W 2 of 0.1 mm or greater and 2.0 mm or less. A curvature radius Rc of the second corner P 2 and a curvature radius Rd of the third corner P 3 are equal to or less than 0.2 mm. Included angles beta 1, beta2, beta3 and beta 4 of the ridge P are 80° or greater and 100° or less. A tire which is obtained by the mold 32 has small grooves with a reversed shape of the ridge P.
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