| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a golf club shaft which increases a head speed without giving odd feeling during swing and is increased in an effective loft angle. SOLUTION: This golf club shaft has, from the tip end T side toward the butt end B side, small-diameter parts S1 to S3, intermediate parts M1 to M3 and large-diameter parts L1 to L2 identified in accordance with the differences in the changing ratios of diameter and is formed by making the diameter of the small-diameter part S3 smaller than the diameter of the intermediate part M1, sharply increasing the diameter of the intermediate part M1 from the tip end side toward the butt end side, making the diameter of the intermediate part M2 gradually larger from the tip end side toward the butt end side or making the same constant, making the diameter of the intermediate part M3 sharply smaller from the tip end side toward the butt end side, gradually changing the diameter of the large-diameter part L1 from the tip end side toward the butt end side or making the same constant, sharply increasing the diameter of the large-diameter part L2 from the tip end side toward the butt end side and forming the bore at the butt end B to the largest diameter in the overall length of the shaft.</p> |
