Abstract: The present invention provides a rubber crawler with high durability by using the rubber composition, wherein said rubber composition exhibits enhanced adherence between rubber and metal reinforcing material, such as steel cord and the like, particularly adherence after heat aging and under high humidity, without using vulcanizing retarder, such as CTP, which has possibility of generating problems, such as blooming and lowering rubber physical properties after vulcanization; using vulcanization accelerator having the adequate vulcanization retarding effect exerting excellent working ability; lowering rubber scorching as much as possible. The rubber crawler of the present invention comprises a rubber composition as the treatment rubber thereof, which comprises in the amount of 0.1 to 10 parts by weight of sulfenamide-containing vulcanization accelerator, 0.03 to 3 parts by weight of cobalt-containing composition as the equivalent amount of cobalt and 0.

Abstract: Tire vulcanizing method and mold, capable of suppressing increase in installation cost and effectively absorbing large fluctuation and change in the rubber volume. A green tire is vulcanized in a mold cavity (3) defined by a core (2) made of rigid a material and having an outer surface shape corresponding to the inner surface shape of a product tire, and also by a vulcanizing mold (1) which surrounds the core (2). At least a portion of the molding surface of a side ring member (6), which forms part of the vulcanizing mold (1), is moved in a direction for increasing the volume of the mold cavity.