When I entered the golf club fitting business about 15 years ago, there was no standard rating system for golf shaft stiffness. Nor was there a consistent, objective way to compare different models.

Shaft engineers define stiffness through an incremental flex profile down the length of the shaft, though proprietary details are rarely shared publicly. To bridge this gap, I developed an accurate 3-point EI bend profile measuring instrument, which is now utilized in quality control by several major shaft companies.

Detailed documentation, data visualizations, and full background information can be found in the referenced source documents. Today, Golf Shaft Reviews provides thousands of uniform, unbiased measurements to help golfers and fitters see past marketing jargon and optimize equipment choices.

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