A process for manufacturing a putter with a bi-material shaft is disclosed herein. The putter comprises a putter head, the bi-material shaft, a mass member and a grip. The bi-material shaft comprises a body with a tip end and a butt end. The body comprises a metal section extending from the tip end to a connection point, and a composite section extending from the butt end to the connection point. The mass member is positioned within an opening at the butt end of the shaft. Mass from the shaft is transferred to the club head and the mass member in the butt end of the shaft.

A process for manufacturing a putter with a bi-material shaft is disclosed herein. The putter comprises a putter head, the bi-material shaft, a mass member and a grip. The bi-material shaft comprises a body with a tip end and a butt end. The body comprises a metal section extending from the tip end to a connection point, and a composite section extending from the butt end to the connection point. The mass member is positioned within an opening at the butt end of the shaft. Mass from the shaft is transferred to the club head and the mass member in the butt end of the shaft.

Examples of golf clubs and methods to manufacture golf clubs are generally described herein. In one example, a golf club may include a golf club head, a hosel portion, and a shaft. The hosel portion may be positioned rearward of a center of gravity of the body portion. The shaft portion may be coupled to the hosel portion and may have a first shaft portion and a second shaft portion. The first shaft portion may extend from the hosel portion and tilt toward the face portion with no lateral tilt toward a toe portion or a heel portion of the body portion. The second shaft portion may extend from the first shaft portion toward the heel portion and toward a face portion of the body portion. Other examples of golf club heads and methods to manufacture the same may be described and claimed.

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 process for manufacturing a putter with a bi-material shaft is disclosed herein. The putter comprises a putter head, the bi-material shaft, a mass member and a grip. The bi-material shaft comprises a body with a tip end and a butt end. The body comprises a metal section extending from the tip end to a connection point, and a composite section extending from the butt end to the connection point. The mass member is positioned within an opening at the butt end of the shaft. Mass from the shaft is transferred to the club head and the mass member in the butt end of the shaft.

A process for manufacturing a putter with a bi-material shaft is disclosed herein. The putter comprises a putter head, the bi-material shaft, a mass member and a grip. The bi-material shaft comprises a body with a tip end and a butt end. The body comprises a metal section extending from the tip end to a connection point, and a composite section extending from the butt end to the connection point. The mass member is positioned within an opening at the butt end of the shaft. Mass from the shaft is transferred to the club head and the mass member in the butt end of the shaft.

A shaft has a weight of 50 g or less. A forward flex is 110 mm or less. A backward flex is 100 mm or less. A shaft torque is 4.0° to 6.5°. The shaft includes a first hoop layer, a second hoop layer longer than the first hoop layer, and a third hoop layer longer than the second hoop layer. An outer diameter at a position 550 mm apart from a tip end is D5. An outer diameter at a position 950 mm apart from the tip end is D9. A crushing strength at the position 550 mm apart from the tip end is F5. A crushing strength at the position 950 mm apart from the tip end is F9. F5/D5 is 1.5 or greater and 2.5 or less. F9/D9 is 1.0 or greater and 2.0 or less. A difference (F5−F9) is 4 kgf or less.

A shaft has a weight of 50 g or less. A forward flex is 110 mm or less. A backward flex is 100 mm or less. A shaft torque is 4.0° to 6.5°. The shaft includes a first hoop layer, a second hoop layer longer than the first hoop layer, and a third hoop layer longer than the second hoop layer. An outer diameter at a position 550 mm apart from a tip end is D5. An outer diameter at a position 950 mm apart from the tip end is D9. A crushing strength at the position 550 mm apart from the tip end is F5. A crushing strength at the position 950 mm apart from the tip end is F9. F5/D5 is 1.5 or greater and 2.5 or less. F9/D9 is 1.0 or greater and 2.0 or less. A difference (F5−F9) is 4 kgf or less.

Provided is a hollow shaft including a hoop layer. The shaft weight is 50 g or less. The shaft has a flexural rigidity EI (N.Math.m.sup.2) and a shaft wall thickness t (mm). In a first region having a distance of 200 mm to 300 mm from the tip end, EI/t is 10 or greater and 40 or less. In a second region having a distance of 800 mm to 900 mm from the tip end, EI/t is 45 or greater and 80 or less. The hoop layer includes a partial hoop layer disposed in a part of an entire length of the shaft. The partial hoop layer includes a specific butt hoop layer that is not present in the first region and that is disposed over an entirety of the second region. The specific butt hoop layer has a thickness of 0.05 mm or greater.

Provided is a hollow shaft including a hoop layer. The shaft weight is 50 g or less. The shaft has a flexural rigidity EI (N.Math.m.sup.2) and a shaft wall thickness t (mm). In a first region having a distance of 200 mm to 300 mm from the tip end, EI/t is 10 or greater and 40 or less. In a second region having a distance of 800 mm to 900 mm from the tip end, EI/t is 45 or greater and 80 or less. The hoop layer includes a partial hoop layer disposed in a part of an entire length of the shaft. The partial hoop layer includes a specific butt hoop layer that is not present in the first region and that is disposed over an entirety of the second region. The specific butt hoop layer has a thickness of 0.05 mm or greater.