A reference state is envisioned in which a golf club is placed on a horizontal plane P with a predetermined lie angle and face angle, and the shaft axis line thereof is disposed within a reference plane that is perpendicular to the horizontal plane P. A center of gravity of the head G is positioned on the back side of the head from the reference plane, and a depth of the center of gravity D that is a distance between the reference plane and the center of gravity of the head G is 20 mm or greater and 30 mm or less. The golf club has a flexural rigidity value EIt (kgfmm.sup.2) of the shaft at a position T3 140 mm away from the tip on the head side being 0.5.times.10.sup.6 or greater and 1.75.times.10.sup.6 or less. More preferably, a value of a ratio (GIt/EIt) of the flexural rigidity value EIt to a torsional rigidity value GIt of the shaft at a position 140 mm away from the tip on the head side is specified to be 0.8.times.10.sup.-2 or greater and 1.2.times.10.sup.-2 or less.

 
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> Method and apparatus for estimating tire/wheel performance by simulation

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