The 2011 Shaft Fitting Addendum is Now Available

If you are looking to advance your knowledge on the ever-confusing world of shafts, take this opportunity to download the 2011 Shaft Fitting Addendum.  This is a companion piece to one of the best books written about shafts called the Modern Guide to Shaft Fitting. And the best part is both of these books are available for free.


For 19 consecutive years, the annual Shaft Fitting Addendum has been the number one resource available for clubmakers and ordinary golfers to find invaluable information on golf shafts. This is just another example of how Hireko is helping out clubmakers, club fitters and fellow golfers alike by providing you with such indispensable information so you can make more well-informed choices when it comes to purchasing new equipment.

What Type of Information Will You Find?

For those that are not already familiar with the Shaft Fitting Addendum, the first thing you will find out is not all R-flex shafts are created equal – that is in terms of flex, torque, bend point, etc. as every manufacturer are their own standard.  In reality, there are no industry standards for shafts and the reason why this book serves as a valuable guide.  I have spent the last 22 years conducting all the 50,000+ measurements on over 3000 shafts that are listed in this text; all of which have been tested using testing methods and equipment.  What this ensures is consistency in testing and reliable results.

There are 19 published specifications listed for each shaft that include:

Flex, Uncut Shaft Weight, Tip Diameter, Butt Diameter, Uncut Shaft Balance Point, Cut Shaft Balance Point, Completed Club Balance Point, Total Assembled Club Weight, Head Weight, Grip Weight, Cut Shaft Weight, Completed Club Frequency, Butt Deflection, Tip Deflection, T/B Ratio, Cut Shaft Torque, Raw Shaft Torque, Club Length (and wood bore type) and DSFI (Dynamic Shaft Fitting Index) Rating

To give you a peek of what information is available, look at the chart below. You can compare shafts from the same or even different manufacturers that are of approximately the same overall stiffness and weight.  In this case the Aldila Serrano, Fujikura Fit-On E250, Grafalloy ProLaunch Blue 55, ProLaunch Platinum with Axis Technology, New Image Red Image Graphite and our own True Ace Death Stick are all mid-50g shafts of similar frequencies and stiffness index.  But find out what the differences are.

How Do I Use the Information?

While offering all of this data is great, being able to take this information, understand what all the numbers represent and then be able apply it into your everyday fitting is another.  This is why we established the Dynamic Shaft Fitting Index (or DSFI for short).  The DSFI takes the Completed Club Frequency, Butt Deflection, Tip Deflection, Cut Shaft Torque and Club Length and puts it into a complex algorithm to put a number on stiffness.  No longer do you need to rely solely on the generic flex designations by the manufacturers.

In Chapter 5, the addendum explains why you may want to select the Aldila Serrano over the Grafalloy ProLaunch Platinum or visa versa. You can also relate Dynamic Shaft Fitting Index to the clubhead speed or the golfer’s driver or 5-iron and be able to make appropriate shaft selections. However, swing speed is only a starting point – certain golfers will use different flexes based on their tempo and length of their swing rather just swing speed.  The 2011 Shaft Fitting Addendum can help you understand these issues.

The 190 page Shaft Fitting Addendum is broken down into 5 chapters, but you don’t have to download everything.  The first shaft provides the legends of what each of the specifications are and we would encourage you to read that carefully.  Chapters 2 and 5 are the nuts and bolts of the 2011 Shaft Fitting Addendum with Chapter 2 showing the data and Chapter 5 providing the how to use the information with the master charts in order of stiffness.

In addition, club fitters or even ordinary golfers can look for suitable replacement shafts that may not exist anymore by looking through the archived shafts (Chapters 3 and 4). These are all the shafts tested that are no longer available but contain information on shafts you may have hit in the past. Matching shafts of similar cut weight, frequency, cut torque and tip and butt deflections will help you find that one shaft you owned previously that they liked so dearly.

Again, if you are an interested at all in shafts or shaft fitting, then this single source of information is indispensable to satisfy the knowledge you might have.


  1. Can’t locate and load Chapter 5 DSFI Listings (bad link)

  2. Jeff Summitt says:


    I’ll get that fixed on Monday. Thanks for pointing it out.

  3. Michael DeVincenzo says:

    How do you measure the shaft length of a driver. From what points. Top of grip to top of hosel??

  4. Jeff Summitt says:


    It is measured from the ground back by the heel of the club along the back edge of the shaft along the lie angle of the club. The end of the grip cap is the last point of reference.

  5. John Parteka says:

    It is 7/4/11. Link to Chapter 5 of the 2011 Shaft Fitting Addendum comes up “File not found.” Would you please check this out? Thanks!

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