GROUND-BREAKING SHAFTS
SPECIFICALLY CREATED TO ENHANCE YOUR GAME
"Can a golf shaft be engineered to deliver a more repeatable downswing transition for greater impact, distance, and control?"
That single question sparked the development of FreeFlex Technology. In pursuit of a shaft that makes the game both easier and more enjoyable, we challenged one of golf's oldest assumptions: that greater accuracy requires a stiffer shaft, even at the expense of speed and distance. What we discovered challenged conventional shaft design.
At SJ Golf Engineering Lab, we found that flex and torque are not inherently linked. A shaft can be exceptionally flexible while maintaining outstanding torsional stability. Our research led to the development of a 38-gram shaft with a 170 CPM flex profile and torque as low as 2.5°—comparable to, and in many cases lower than, traditional extra-stiff tour shafts.
This breakthrough became the foundation of the FF38 and FF45 Special Series, enabling golfers to swing with greater freedom while pursuing more distance, tighter dispersion, and improved consistency.
Our pursuit of innovation continued with the introduction of Carbon Bending Technology (CBT) in 2023. By rethinking how a shaft loads, bends, and recovers throughout the swing, CBT opened an entirely new chapter in shaft engineering—one that continues to redefine what golfers can expect from modern performance.
FEATURED ON GOLFWRX
“We have developed a unique shaft to which the pronate and supinate principles have been applied by considering not only the swing torque acting upon the shaft; but also in considering the warping moment and bending torsional moment to optimize Impact and MOI.”
Dr. Seung-jin Choi on FreeFlex Technology
“CBT technology involves reinforcing the shaft in ways that rein in the excessive shaft and club head movement to yield tighter dispersion with little or no left miss.”
Dr. Seung-jin Choi on Carbon Bending Technology
Copyright © 2023 SJ Golf Engineering Lab
