Golf club shaft
View Patent ↗A golf club shaft, wherein when a distance from a shaft front end to a shaft gravity center point is L G and full length of the shaft is L S , 0.54≦L G /L S ≦0.65 is satisfied, a shaft weight is 55 g or less, and a bending rigidity value EI at a point of 630 mm from the shaft front end to the shaft rear end side is 2.3 kgf·m 2 or less.
1. A golf club shaft, wherein said shaft has a weight of 55 grams or less, and when a distance from a tip end of the shaft to a shaft gravity center point is LG and full length of the shaft is Ls, the relationship 0.54≦Lg/Ls≦0.65 is satisfied, and wherein a bending rigidity value EI at a point of 630 mm from the shaft tip end to the shaft butt end side is 2.3 kgf*m2 or less, and wherein a weight ratio of a butt partial layer includes a butt partial layer with respect to the shaft weight is not smaller than 5 weight-% and not larger than 50 weight-%, wherein the butt partial layer includes a butt straight layer, butt hoop layer, and butt bias layer.
2. The golf club shaft according to claim 1 , wherein a low elasticity material including fibers with a fiber elastic modulus of 20 t/mm 2 or less is used for a butt side part.
3. The golf club shaft according to claim 2 , wherein a fiber orientation angle of the fibers in the low elasticity material is 0±10 degrees.