Abstract: The present invention relates to an improved venting apparatus installed in a tire vulcanizing mold. In the venting apparatus, an inner diameter of a center through hole formed in the casing is gradually increased in an upper direction and is gradually decreased in a lower direction for thereby forming a tapered shape. The angles of the slant surfaces of the valve head point-contacting with an upper corner portion of the center through hole are different, so that a discharging capability of air is enhanced, and it is possible to prevent a formation of a vent rubber in a finished tire which vent rubber is formed when a rubber flows into a venting apparatus. In addition, it is possible to prevent an error operation during vulcanization and to extend a life span of a venting apparatus. The maintenance is easier.

Abstract: The present invention relates to an improved venting apparatus installed in a tire vulcanizing mold. In the venting apparatus, an inner diameter of a center through hole formed in the casing is gradually increased in an upper direction and is gradually decreased in a lower direction for thereby forming a tapered shape. The angles of the slant surfaces of the valve head point-contacting with an upper corner portion of the center through hole are different, so that a discharging capability of air is enhanced, and it is possible to prevent a formation of a vent rubber in a finished tire which vent rubber is formed when a rubber flows into a venting apparatus. In addition, it is possible to prevent an error operation during a vulcanization and to extend a life span of a venting apparatus. The maintenance is easier.

Abstract: A radial tire when mounted on a rim and filled to normal inner pressure has a ratio of the upper cross-sectional height USH to the cross-sectional height SH between 0.50 and 0.59, a ratio of the lower cross-sectional height LSH to SH between 0.40 and 0.50, a rim width of more than 1.40 times the measuring rim width MRW but less than 1.45 MRW, an aspect ratio of less than 0.65, a beadfiller height of greater than 0.224 SH, and an angle between the tangent to the carcass line at a bead upper point B and a line extending in parallel with the rotation axis of the tire is less than 45°.