A shaft 6 includes a plurality of layers formed by fiber reinforced resins. The layers include a hoop layer and bias layers. The hoop layer includes a full length hoop layer s9 constituted with a prepreg having a fiber elastic modulus of equal to or greater than 30 (tf/mm.sup.2) and having a fiber weight per unit area of equal to or greater than 50 (g/m.sup.2) but equal to or less than 80 (g/m.sup.2). The bias layers s2, s3, s4, and s5 include high elasticity containing bias layers s4 and s5 constituted with a prepreg contacting a high elastic pitch-based carbon fiber having a fiber elastic modulus of equal to or greater than 80 (tf/mm.sup.2). Preferably, the full length hoop layer s9 is disposed outside the high elasticity containing bias layers s4 and s5.

A golf club 2 includes a shaft 6 having a weight of 50 g or less. The shaft 6 has a ratio of a center of gravity of 0.54 or greater. Respective EI values measured at intervals of 100 mm from a point 130 mm distant from a tip end Tp are defined as E1 to E10. A first region, a second region, and a third region are defined by boundaries at respective points having distances of 230 mm and 830 mm from the tip end Tp. In a graph on which the EI values are plotted, gradients of approximate straight lines in the first region, the second region, and the third region are defined as M1, M2, and M3, respectively. M1 to M3, E9/E6, and E10/E6 are fall within respective specified scopes. M3 is greater than M2.

A golf club 2 includes a shaft 6 having a weight of 50 g or less. The shaft 6 has a ratio of a center of gravity of 0.54 or greater. Respective EI values measured at intervals of 100 mm from a point 130 mm distant from a tip end Tp are defined as E1 to E10. A first region, a second region, and a third region are defined by boundaries at respective points having distances of 230 mm and 830 mm from the tip end Tp. In a graph on which the EI values are plotted, gradients of approximate straight lines in the first region, the second region, and the third region are defined as M1, M2, and M3, respectively. M1 to M3, E9/E6, and E10/E6 are fall within respective specified scopes. M3 is greater than M2.

Embodiments of a golf club comprising a club head, a shaft, and features that improve bonding strength between the club head and the shaft are described herein. The club head comprises a hosel that receives a tip end of the shaft. The shaft tip end defines a shaft bonding area and an effective bonding area. The features described herein are designed to increase the effective shaft bonding area with the hosel to improve bonding strength between the club head and the shaft. In some embodiments, the features comprise microgrooves located within the shaft bonding area. The microgrooves can increase the effective bonding area and provide multi-directional resistance to forces applied to the shaft. In some embodiments, the features comprise a ferrule including a weighting feature that replaces a tip weight. In some embodiments, the features comprise a hot melt weight located within the shaft.

Training equipment includes a hollow shaft having a sidewall defining an internal cavity and at least one polymer material filling at least a portion of the internal cavity. The polymer material may fill the entire internal cavity of the hollow shaft. The polymer material may be a visco-elastic polymer material or polyurethane. A spacer or a filler may fill at least a portion of the internal cavity. A method of making weighted training equipment with a hollow shaft having a sidewall defining an internal cavity may include injecting a curable composition into at least a portion of the internal cavity. The method may further include curing the curable composition into a polymer material.

A sport apparatus comprising a shaft, wherein the shaft comprises a notch fitting and a sensor housing. The sensor housing comprises an alignment rib fitting, printed circuit board, rechargeable battery, one or more motion sensors, a transceiver, an inductive charging coil, among other necessary elements for the sport apparatus as described herein. A portion of the sensor housing resides within the shaft, wherein the alignment rib of the sensor housing mates with a notch or other locking mechanism of the shaft.

A golf club shaft includes a shaft body having a butt end and a tip end, and a counterweight member on an outer periphery of the shaft body between the butt and tip ends. The counterweight member is made of a fiber composite material configured in a way that the counterweight member has a color visually distinguishable from that of the shaft body.

A golf club shaft system and golf club shaft possessing unique flexural and torsional rigidity profiles, while providing significant adjustability to fine tune the shaft to a particular golf swing.

A golf club shaft system and golf club shaft possessing unique flexural and torsional rigidity profiles, while providing significant adjustability to fine tune the shaft to a particular golf swing.

A shaft for a golf club includes a first end, a second end, and a demarcation. The first end is adapted to attach to a club head. The second end is adapted to receive a grip distal to the first end. The demarcation is positioned at or adjacent to the balance point of the golf club between the first end and the second end.