Why Do We Fit Golf Clubs Using A L, R, S and X Designations

I had always known that there was no standardization in shaft stiffnesses from one manufacturer to another but felt that within the specific companies there would be a standard for these designations. In my recent work with The Ben Hogan Golf Co. to set up their Club fitting system using a wide variety of shafts, I even found this to be wrong. The following table summarizes the difference in the natural frequency of the various designations in the products of several Manufacturers.

▪ Natural Frequency Deviation in Cycles/Minute - cpm by Manufacturer for X, S and R shafts


Understand that if you are told you need a stiff shaft for your swing, to get the right one from this group of manufactures, you are searching in an low to high range of 51 cpm. What does this mean? To get a fit that will give you your best distance and accuracy we have found you must be within 4 cpm of the correct natural frequency to fit your swing timing. It is up to the fitter to pick that shaft for you but he must know your natural frequency requirement and the frequency of the selected shaft when built into the club assembly. Trying to get the correct frequency by just knowing you need an R, S or X is hit and miss. We can see why it is mostly miss if you do not know the exact frequency you need and the frequencies of the club when built with the selected shaft. Using Frequency as the designation is the most accurate way of designating club stiffness and does not change from manufacturer to manufacturer. This is the basis of the fitting system being developed by Perfected Golf Group, Ltd. for The Ben Hogan Golf Equipment Co..

​As a Golf Professional this is a great chance for you to participate in this advanced club fitting development program during a program proof phase. There will be no charge for the fitting and while clubs that you might order will be built to your swing frequencies. Your help with proving the shaft selection system works is to insure that the shaft the system selects will produce the correct frequencies. If they do not produce the required frequency the shaft data and/or the selection process will be adjusted to make the proper selection. Even though we may run into such circumstances your order will be built right to your specification by re-selecting the proper shaft after any necessary adjustments in the system. Currently we are working with Irons and Hybrids only. Please Contact us for more detailed information on the this program.

email: fitchip@twc.com

phone: 239 910 7815

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PerfectedGlof Group, Ltd 

           A Custom Golf Club Fitter 

 Shaft Stifness        X     S     R
51   50   41 
10   63   80
6   23   24
 23   17   23
13   22 
20   19
 24   14     8
Variance  Low to 

High in  group of 7  51  84  85