If you want to understand golf shafts you have come to the right place. Golf Shaft Reviews is my freelance journal about golf shafts. At last, the term EI profile, is part of the discussion shaft companies are having with golfers. I have been writing about EI profiles on this journal for 7+ years. It is now owned and used by several shaft companies. I designed and manufactured a simple but very accurate EI measuring instrument. I was fortunate to have the opportunity to tour a shaft company R&D lab and my understanding of golf shaft technology was shaken to the core. I learned the terms EI and GJ in discussions with shaft engineers. However, shaft engineers and designers define golf shaft stiffness as a profile, the shape of stiffness down the length of the shaft. These terms developed into a mythological language for describing golf shafts. Shaft company marketing staff developed terms, “kick point”, “stiffness”, “launch” and “spin” to describe shaft properties. So as the saying goes, necessity is the mother of invention. Describing golf shaft properties is not a simple task. That was and still is a problem for understanding what shaft is best for your game. There was no standard rating system for golf shaft stiffness. When I entered the golf club fitting business about 15 years ago, there wasn’t any way to compare golf shafts.
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