A club 2 includes a head 4 , a shaft 6 and a grip 8 . A club length L 1 is 45 inches or greater and 48 inches or less. A ratio (Wh/Wc) of a head weight Wh to a club weight Wc is equal to or greater than 0.71. A moment of inertia Ix about an axis of a swing is equal to or less than 6.90×10 3 (kg·cm 2 ). However, when the club weight is defined as Wc (kg); an axial-directional distance between a grip end and a center of gravity of the club is defined as Lc (cm); and a moment of inertia about the center of gravity of the club is defined as Ic (kg·cm 2 ), the moment of inertia Ix (kg·cm 2 ) is calculated by the following formula (1). Ix=Wc× ( Lc +60) 2 +Ic (1)
1. A golf club comprising:
a head;
a shaft having a shaft length defined as Ls, an axial-directional distance between a tip of the shaft and a center of gravity of the shaft defined as Lg, and a ratio Lg/Ls of 0.5 or greater and 0.67 or less;
a grip;
a club weight defined as Wc (kg);
an axial-directional distance between a grip end and a center of gravity of the golf club defined as Lc (cm);
a moment of inertia about an axis parallel to a virtual axis of swing and passing through the center of gravity of the golf club defined as Ic (kg·cm 2 ), and
a moment of inertia Ix about the virtual axis of swing calculated by the following formula (1):
Ix=Wc ×( Lc+ 60 cm) 2 +Ic (1),
wherein the moment of inertia Ix is equal to or less than 6.90×10 3 (kg·cm 2 ).
2. The golf club of claim 1 , further comprising a head weight Wh, wherein a ratio Wh/Wc is equal to or greater than 0.71.
3. The golf club of claim 2 , wherein the ratio Wh/Wc is equal to or greater than 0.72.
4. The golf club of claim 2 , wherein the golf club is a driver.
5. The golf club of claim 2 , wherein the golf club comprises a club length between 45 inches or greater and 48 inches or less.
6. The golf club of claim 1 , wherein the golf club is a driver.
7. The golf club of claim 1 , wherein the golf club comprises a club length between 45 inches or greater and 48 inches or less.
8. The golf club of claim 1 , further comprising:
a static moment of the golf club defined as Mt (kg·cm) and calculated by the following formula (2):
Mt=Wc ×( Lc− 35.6 cm) (2); and
a ratio Ix/Mt equal to or less than 435 cm.
9. The golf club according to claim 1 , wherein a head weight Wh is equal to or greater than 0.175 kg.
10. The golf club of claim 1 , wherein a shaft weight is equal to or less than 50 g.
11. The golf club of claim 1 , wherein a grip weight is equal to or less than 40 g.
12. A golf club comprising:
a head;
a shaft having a shaft length defined as Ls, an axial-directional distance between a tip of the shaft and a center of gravity of the shaft defined as Lg, and a ratio Lg/Ls of 0.5 or greater and 0.67 or less;
a grip;
an axial-directional distance between a grip end and a center of gravity of the golf club defined as Lc (cm);
a club weight defined as Wc (kg);
a virtual separation distance Dx being about 60 cm;
a moment of inertia about an axis parallel to a virtual axis of swing and passing through the center of gravity of the golf club defined as Ic (kg·cm 2 ); and
a moment of inertia Ix about the virtual axis of swing (kg·cm 2 ) calculated by the following formula (1):
Ix=Wc ×( Lc+Dx ) 2 +Ic (1),
wherein the moment of inertia Ix is equal to or less than 6.90×10 3 (kg·cm 2 ).
13. The golf club of claim 12 , further comprising a head weight Wh, wherein a ratio Wh/Wc is equal to or greater than 0.71.
14. The golf club of claim 13 , wherein the ratio Wh/Wc is equal to or greater than 0.72.
15. The golf club of claim 13 , wherein the golf club is a driver.
16. The golf club of claim 13 , wherein a club length is 45 inches or greater and 48 inches or less.
17. The golf club of claim 12 , further comprising:
a static moment of the golf club defined as Mt (kg·cm) and calculated by the following formula (2):
Mt=Wc ×( Lc− 35.6 cm) (2); and
a ratio Ix/Mt equal to or less than 435 cm.
18. The golf club according to claim 12 , wherein a head weight Wh is equal to or greater than 0.175 kg.