The way to measure by this chart. If your CPM with Driver is 240CPM and the length of the driver is 44" Long. The Flex should be A flex. (Senior, Lite) If your 7 Iron is 320CPM and it is 37" Long. The flex for it should be Regular Flex.
Frequency is the measurement of the butt stiffness (stiffness at the grip end) of a particular shaft. For years custom clubfitters have used butt frequency as the measurement tool to compare the specific stiffness between various shafts. The shaft is placed into a frequency analyzer and oscillated either up and down or side to side. A counter on the analyzer calculates the cycles per minute (CPM). The higher the CPM reading, the stiffer the shaft and visa-versa. However, butt frequency does not take into account the tip design of a particular shaft. Therefore it is critical to identify the type of ball flight you desire to achieve and find a shaft with proper tip characteristics to optimize trajectory.
However, there is "No Standard" measurement in Golf. For example, Titleist Stiff Shaft will be much stiffer than Callaway Stiff because Titleist define their stiff CPM measurement different.
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