What does ‘CPM’ of a golf shaft actually mean?
Simply put, CPM stands for “cycles per minute,” which measures the frequency of a golf shaft. To obtain this measurement, a fitter or club builder places the grip end of a golf club into a clamp, then pulls on the tip section of the shaft and releases it to make it oscillate. Golf shafts typically read between 200 (low frequency) and 300-plus (high frequency); the lower-end of the scale would be a shaft that flexes a lot, while the high end of the scale are very stiff shafts.
Many believe that CPM is actually the true flex of a shaft.
Every shaft company makes shafts differently, and the flexes those companies display are different, too. For example, an “X-flex” of a Graphite Design shaft won’t be the same as an “X-flex” of a Mitsubishi shaft.
Shaft companies measure flexes differently, and their shafts are also made with different materials, wall thicknesses, butt stiffness, bend points, balance points, and a number of other factors. Those factors affect not just how a shaft plays and feels, but how a shaft measures on the CPM machine, as well.
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