| 摘要 |
PROBLEM TO BE SOLVED: To enhance irregular wear resistance of a tire having a thin groove in a circumferential direction without damaging durability of a mold. SOLUTION: There are provided, on a tread molding surface 21F, thin groove forming pieces 23 protruding and ending to face each other from a separate surface 22F in a circumferential direction keeping a clearance of 0.3 to 3.0 mm. The thin groove forming piece 23 has a thinner portion 24 at the ending side, the height Dt of the thinner portion 24 being not less than 1/4 of the height Ds of the thin groove forming piece 23, a holding angleθbetween both the side surfaces 24F holding the thinner portion 24 being 40 to 140 degree. |
