Each segment sooner or later

摘要

The one longitudinal end surface 17a of each segment 16, one end of the surface 20, only the gas so formed a passable discharge groove 34 and the other end is opened to the side surface 36 and back surface 35, when performing vulcanization, and the gas remaining between the segment 16 and the tire tread is to discharge groove 34 and the discharge passage 37 is effectively discharged to the side surface 36 side. At this time, only the gas can pass through the discharge groove 34 is not to be considered to enter the discharge groove 34, unvulcanized rubber is prevented occurrence spew, and Bali.