It’s clear that a lot of threads and posts in the GolfWRX forums are from golfers asking all sorts of questions about shafts. In nearly 40 years of golf equipment design and research work, I think it is fair to say that the shaft is the least understood component of the golf club.
I have engaged in serious shaft research since 1990, and from that have learned a lot about shaft design, performance and fitting, I would like to help clear some things up and share some facts about shafts and what you need to know to pick the best shaft for YOUR swing.
I will do my best to make all of this understandable without stressing everyone’s attention span. But there is a lot to explain about this subject so I will separate this into three parts with some time in between each thread to allow you to digest it and ask questions.
How Can Golfers TRULY Compare Shafts to Know their Real Performance Differences?
Below is a typical “specification chart” from a major shaft company. I have removed the names because it is not my intent to criticize a specific shaft maker. It is simply my desire to show you how the typical information provided about shafts will not allow golfers to know what they really need to know about shafts to be able to make an informed buying decision.
Plain and simple, the information in this chart cannot tell a golfer how any of these shafts truly perform, much less how they actually compare in stiffness to any other the shaft.
The flex? There are no standards for exactly how stiff any of the flex letter codes are. Charts like this provide no quantitative measurements of exactly how stiff any shaft might be. In fact the ONLY bits of information on a typical chart like this which can be helpful are the WEIGHT and the TORQUE.
The butt and tip diameter? These are fine for knowing what the hosel bore of the clubhead needs to be to easily accept the shaft and to know how to install the grip to obtain a desired size.
The parallel tip section? That simply tells you if you cut more than 2 inches off the tip, it’s not likely to fit all the way into any normal hosel with a 0.335-inch bore.
The bend point? Sorry, but the term bend point is not relevant because with terms like “high,” “mid,” or “low,” it has always been way too generic. WHERE EXACTLY IS a mid bend point? And how does this mid bend point compare to some other company’s mid or low or high bend point?
Recently I have seen a couple of other shaft companies begin to offer a form of QUANTITATIVE stiffness measurements for their shafts. Here’s an example:
This shaft company offers a series of stiffness profile measurements for the butt, mid and tip sections of their shafts. That’s a start, but the problem is that this company only offers these stiffness profile measurements for their own shafts. This is somewhat reasonable for comparing the various shaft models and flexes within this one company, but what if you have some other company’s shaft in your driver, or you wish to compare these shafts to some other company’s shafts? And if you have never hit one of these shafts, how stiff or flexible are any of these measurements in the first place? These rudimentary stiffness profile measurements do not allow the depth and scope of stiffness information to allow you to make a valid shaft fitting decision.
You might look at the butt stiffness number and say, “That’s a frequency measurement and I know how stiff a 270 cpm shaft plays.” Yes, that butt stiffness number is a frequency measurement. But the problem is you have no idea how these butt frequency measurements were obtained.
- What length of the butt was clamped?
- How heavy was the tip weight?
- Is this 270 cpm frequency the same as a 270 cpm shaft that you played?
Again, there are no standards in the golf industry for shaft frequency measurement so you have no idea if a measurement of say, 270 cpm from this company is equivalent to a measurement of 255 cpm or 265 cpm or whatever cpm using one of the many other types of shaft frequency measurement.
What makes all this even more “exciting” or I should say, challenging, is the fact the industry is now populated with many shafts that are VERY expensive. Do you really want to GUESS whether that $300 shaft is right for you, or would you like to have a more definitive way to help make that decision?
Is there a Better Way to Compare Shaft Stiffness?
Ever since I began to perform quantitative measurements on shafts, I knew we needed a way to be able to see and compare the stiffness of as many shafts as possible, and do it over their entire length. That way, club makers and golfers could have a tangible way to compare the complete full length stiffness design of shafts to each other. The performance and the bending feel of any shaft are products of its stiffness design over its entire length. Not just the butt, not just the tip, but the whole length of the shaft. There are almost an infinite number of ways the stiffness of a shaft can be created over its entire length.
In 2005, we arrived on a reasonably simple method to perform full length comparative stiffness measurements for golf shafts. From this, we created a software program that would house and display the data from our shaft stiffness comparison methodology. We made the first version of the software available to club makers in 2006. Two times each year we ask the shaft companies to send us multiples of each of their new shaft models and flexes so we can keep adding shafts to the software data base.
At present, we have more than 2,000 different wood, hybrid and iron shafts in the TWGT Shaft Bend Profile software. We charge a one-time fee of $129.50 for the software because the expense to have it programmed and maintained is not insignificant. It also takes us quite a number of hours to acquire, test and input the new shaft data into the software two times each year. You can find more information about this on my site, which is linked in my bio.
As much as we would like, there is no possible way we can include EVERY shaft in the industry in the software’s data base. We have to rely on the shaft companies to send us the multiple samples of each of their shafts to measure because we simply cannot afford to actually buy all of the shafts. We also cannot obtain the OEM stock shafts because the OEM companies will simply not allow anyone to have their raw shafts for any measurement work like this. We do have some OEM stock shafts in the data base, which come from “pulls” from OEM clubs that we can measure. But we do try to put as many shafts as we can into the data base so that clubmakers and golfers can better compare the relative stiffness of shafts.
To date more than 600 different club makers now use the TWGT Shaft Bend Profile software in their shaft fitting. This use by the club makers has also provided “in the field” verification that the measurements of the shafts do indeed provide a valid representation of the performance and even the bending feel of the shafts in the data base. The shaft fitting comparisons made with the data in the TWGT Shaft Bend Profile software is most definitely valid for predicting the performance and feel of a shaft.
How Does the Bend Profile Data Explain the Performance and Differences Between Shafts?
Some of you have seen graphs from the TWGT Bend Profile software that I have posted to answer a question here and there about shafts. For those of you who have not seen this, the following is a basic screen image from the software showing a comparison of the relative stiffness design of two shafts. I just randomly chose to use the Mitsubishi Rayon’s Diamana White 83 X5CT S flex and the UST ProForce V2 HL65 S flex to start the explanation.
You see seven columns in the data box. These show WHERE on the shafts we do the stiffness measurements. Starting at 11 inches up from the tip, the measurements then are made at 5-inch spaced positions up from the tip end of each shaft, ending at 41 inches up from the tip. Because iron and hybrid shafts are shorter in raw length, their measurements run from 11 inches up to 36 inches up from the tip end of the shafts.
Measurements are done with a 454 gram weight attached to the tip of the shaft using a specially designed frequency analyzer that measures the shaft oscillations using two separate load cells and two separate strain gauges. Each shaft is tested at the same exact place on the shaft, using the same exact test methodology. This ensures the data is comparable from shaft to shaft to shaft in the data base of the software.
Let’s take a look at an example graph and data chart
The 41-inch, 36-inch and 31-inch measurements represent the butt section, the 31-inch, 26-inch and 21-inch measurements represent the center section and the 21-inch, 16-inch and 11-inch measurements represent the tip section of the shaft (yes, there is an overlap).
When companies design different flexes of a shaft, each different letter flex version is ordained chiefly by the stiffness measurements of the 41-inch to 21-inch positions of the shaft (butt, to center, to upper tip). Tip section differences on shafts do not play as significant of a role in the overall flex design (swing speed rating) of a shaft as do the butt to center to upper tip sections. The tip section design of a shaft is chiefly designed to create differences in the launch angle, trajectory and spin rate among shafts within the same flex.
After significant research and study of the shaft data, we can make conclusions about how much of a difference in the stiffness measurements is significant or not. With so many shafts in the data base, we can also identify a basic relationship between a golfer’s clubhead speed, the average bending force generated by that clubhead speed, and the overall stiffness design of a shaft. This is very important for being able to tell a golfer which shaft may be better suited to his clubhead speed. Therefore, we can use the stiffness measurements of the 41-inch to 21-inch positions on the shaft to determine the swing speed rating of any shaft.
We can also determine how much of a measurement difference is significant or not with respect to stiffness in the butt, center and tip sections of the shafts.
- For example, at the start of the butt section, as represented by the 41-inch measurement, a measurement difference of 8-to-10 cpm is approximately equivalent to one full letter flex difference.
- At the middle of the center section, as represented by the 26-inch measurements, a difference of 12-to-15 cpm is equivalent to one full letter flex difference.
- In the middle of the tip section, as represented by the 16-inch measurement, a difference of 30-to-40 cpm usually accounts for a visible difference in the launch angle, trajectory and spin rate of the shot.
There are no standards for how stiff any of the letter flex designations of shafts may be. How stiff IS an R flex, an S flex (or any of the other letter flexes)? How much variation is there among shafts of the same letter flex?
Below is data to show the low-to-high range in stiffness for all shafts for drivers and fairway woods in our data base that are marked as being a letter R flex shafts. These are listed from softest to stiffest, but all of these are made and marked by their respective companies to be an R flex shaft.
Based on the measurements of the 41-inch and 36-inch sections for the butt section, you are looking at a range of FOUR FULL FLEXES. That means the R flex shafts in the golf industry actually exist within a range of four full flexes. The same is true for S flex shafts, as well.
Because there are far fewer L, A and X flex shafts, the range in stiffness within these letter flex codes is not quite as wide as it is within the R and S flex shafts. Here is the Bend Profile graph and data chart to illustrate the range in R flex shafts for woods that exist today.
Based on all of our research to associate a driver clubhead speed with the measurements for the 41-inch, 36-inch, 31-inch, 26-inch positions of the butt and center of the shaft, here are the appropriate driver clubhead speed ratings for each of these above five different R flex shafts:
- Miyazaki C.Kua 39 R: For a golfer with a driver clubhead speed of 55-to-65 mph
- UST ProForce V2 HL-55 R: For a golfer with a driver clubhead speed of 65-to-75 mph
- Aldila RIP’d NV65 R: For a golfer with a driver clubhead speed of 75-to-85 mph
- Fujikura Blue 004 R: For a golfer with a driver clubhead speed of 85-to-95 mph
- Rapport Blue Velvet R: For a golfer with a driver clubhead speed of 95-to-105 mph
Therefore, you are looking at shafts in the golf industry that match up to a range in swing speed of 50 mph, yet ALL are marked and sold as R flex shafts.
You may be prompted to comment, “This has to be the exception rather than the rule.” If we take a look at the data base to search where the majority of R-flex shafts lie with respect to their 41-inch, 36-inch and 31-inch butt section measurements, we find that the majority of R-flex shafts exist within a range that represents a 20-to-30 mph difference in the clubhead speed rating for the shafts.
This is precisely why golfers sometimes buy a new club and its shaft doesn’t feel as stiff or feels stiffer than their previous shaft with the same letter flex.
Do all shafts of the same letter flex have the same butt-to-center section stiffness (same swing speed rating) within the same shaft company or the same golf club company?
Let’s take a look at the R-flex version of a number of different shaft models from one shaft manufacturing company. All are selected on the basis of being very close to the same shaft weight so they potentially could be considered for purchase by the same golfer.
I want to be sure to first make something clear. I am NOT saying it is wrong for a company to make the same letter flex version of each different shaft model to be of a different stiffness design. That is their right as a company to determine the exact design of each flex for each shaft they make.
What I am saying is that it is very difficult for consumer golfers to know how to choose the shaft that might best match their swing when the companies provide no empirical information like this to use for making quantitative comparisons of the different shafts.
The swing speed range for all these R-flex shafts from Aldila ranges by 25 mph. At one end, the NVS 65-R is a shaft that would be rated for use by a golfer with a driver clubhead speed of 70-to-80mph. At the other end, the RIP Gamma 60-3.6-R is a shaft that would be rated for use by a golfer with a driver clubhead speed of 85-to-95 mph. That means within all the R-Flex shafts from Aldila, the clubhead speed rating for possible selection by a golfer can range by 25 mph – yet all are marked as being an R-Flex shaft.
On top of this are definite differences in the TIP SECTION design of all these different R-flex shafts. Within all the R-Flex shafts from Aldila, we see shafts with a tip section design that ranges from the very tip-soft (Habanero 60-R) all the way up to the moderately tip stiff design of the RIP Gamma 60-3.6-R. If both these R-flex shafts were hit by the same golfer, the Habanero would launch the ball approximately 3-degrees higher and with an estimated 750 rpm more backspin than the RIP Gamma 60-3.6-R. Yet again, both are marked as R-flex shafts.
Again, each company is free to design their shafts as they see fit, for whichever golfer swing types they designate. But how can any golfer really know the difference in the overall stiffness design of any of these shafts and from that, know anything about the performance difference between these shafts of the same flex without clear, quantitative comparative information?
Please understand that variation between the same letter flex of different shaft models goes on INTENTIONALLY with every shaft company in the golf industry. It is not specific to Aldila. I simply use them to illustrate that this does happen within each shaft manufacturing company. Without a clear, quantitative means to compare the stiffness design of shafts, consumer golfers are in the dark with respect to making accurate shaft buying and shaft fitting decisions.
For those of you who made it this far, CONGRATULATIONS! You ARE indeed interested in shafts. For those of you who didn’t… well, true shaft knowledge can be a little beyond a normal realm of interest, I do admit that. I hope you all got something out of this, and there is more to come to help you know much more about how to determine the differences between shafts and how to turn that information into better shaft buying decisions.
By the way, there are many custom clubmakers out there who can help you find the right shaft FAR more accurately than the ways you have been trying to pick the right shaft in the past. These club makers who study this stuff are worth knowing and can help you. Again, to find a good club fitter, check out these sources:
- The AGCP (Association of Golf Clubfitting Professionals)
- The ICG (International Clubmakers’ Guild)
- The TWGT Clubmaker Locator
- Part 1 — Taking the guesswork out of selecting shafts
- Part 2 — Taking shaft fitting from guessing to specifics
- Part 3 — Facts about shafts, and what they do
David Edel explains his unique putter fitting system on the 19th Hole
Host Michael Williams takes the show on the road to the Abaco Club at Winding Bay in the Bahamas, where he talks with David Southworth of Southworth Development about the spectacular golf course that attracts pros and amateurs alike. Also, master putter maker David Edel talks about how he developed his unique fitting system and the other technologies he uses to help you make more putts.
Listen to the full podcast on SoundCloud below, or click here to listen on iTunes!
GolfWRX 2018 Women’s Spring Fashion Shoot
In the video below, we present you the first ever GolfWRX Women’s Fashion Shoot presented by Jordan Madley, GolfWRX’s resident fashion consultant. Madley is a fashion model/stylist who has been in the business worldwide for over 20 years, and in this video, she’s helping women golfers with their fashion decisions this Spring… on the course and off.
This fashion initiative is a new endeavor for GolfWRX, and we are excited to expand the conversation even further season-to-season with segments on upcoming fashion trends for both men and women. The fashion landscape has changed drastically in the past 10 years, and we are eager to explore boutique, classic, urban, mainstream and everything in between. Let us know what you would like to see in the coming months; we are thrilled to highlight the fashion brands we think deserve to be recognized going forward.
Special thanks to Eggplant Picture & Sound for cutting this together.
Companies featured in the video include:
- Heather Grey/Haus of Grey
- Royal Albatross
- Electric Sunglasses
- Tory Sport
- Foray Golf
Follow us @GolfWRX where we’ll be releasing more information on each of the outfits highlighted in the video above in the coming days.
A Letter from the Editor: Big changes are happening at GolfWRX
For those of you who don’t know who I am, my name is Andrew Tursky. I recently went from the right-hand-man of former GolfWRX Editor-in-Chief Zak Kozuchowski, to running the show here at GolfWRX as the Editor-in-Chief myself. In my new role, I’m going to help GolfWRX fulfill its fullest potential as the best golf website in existence, and that means making a number of immediate changes, all of which I’ll highlight below.
First, a look back. Over a decade ago, GolfWRX started as a small community golf forum for golfers to discuss golf equipment, courses, instruction, rules, bargains, and everything else golf related. The forums continue to grow everyday, and they’re stronger than ever with over 250,000 members who are the most knowledgable and passionate golfers on the planet. They also helped us determine the Best Driver of 2018. Additionally, sometime around 2011, Kozuchowski took GolfWRX.com from simply a community golf forum to a golf media powerhouse by adding a front page section of the website, equipped with ultra-professional editorial. He built a team of Featured Writers — consisting of some of the biggest names in the golf industry — to help produce content that readers love and need. Since 2013, I’ve been helping Zak run the site by writing/producing original content myself, and working with the Featured Writer team. Currently averaging over 1.8 million unique readers per month, GolfWRX has been doing just fine. But I believe so strongly in the GolfWRX brand that I don’t want to settle for “just fine.” I believe we have more to offer, and I want every golfer in the world to garner entertainment or knowledge from our website.
As such, and building upon the foundation that is GolfWRX.com and the forums, I’ve been empowered by the “powers that be” at GolfWRX — you know, the guys who cut paychecks — to grow and shape the best golf website on the Internet.
So what does that mean going forward? Well, that’s what I wanted to discuss.
Here at GolfWRX, we’ve always been great at telling stories through the written word and images, and we will continue to do so with our Featured Writers team and legion of golf writers who love and know the game of golf. But after taking over the editorial direction of the website, I also wanted to help give GolfWRX a voice and a face. There are so many amazing people in the world of golf, and I wanted to provide platforms for us to help them tell their stories… to provide our readers the chance to see how golf clubs are made, how courses are designed, why professionals play certain equipment, and so much more. I wanted to bring readers where they’ve never been and hear from the people they’ve never heard from. Here at GolfWRX, we have the opportunity to speak with amazing people and play golf at amazing courses, and it’s about time the GolfWRX readers got to enjoy those experiences with us.
Therefore, we’re implementing our own original video and radio initiatives.
On the video-end of the spectrum, GolfWRX has recently hired Johnny Wunder full-time to the GolfWRX Staff. He’s a Hollywood producer (check out his new film Josie, starring Sophie Turner from Game of Thrones, that was recently in select theaters across the country!) and is also the new Director of Original Content at GolfWRX. If you’ve enjoyed the Bob Parsons interview, Paige interview, PXG Gen2 Editor’s Journal, or how PXG irons get built, you have Mr. Wunder to thank. Also coming soon are experiences with Mike Taylor at Artisan Golf, David Edel, Bert Lamar of Iliac Golf, the Criquet Golf team in Austin, a short game series with Gabe Hjertstedt, a new fashion series and much more. We’re extremely excited to bring our own original content to the world, and help highlight the people in golf who we think deserve a platform. See the things you’ve never seen, go places you’ve never gone, and meet people you’ve never met; that’s what we want to do with our new GolfWRX original video content. We truly hope you enjoy it, and learn a lot from the content we produce.
We’ve also started three great podcasts — the “19th Hole with host Michael Williams,” “Two Guys Talkin’ Golf,” and “Gear Dive” — with plans to expand in the very near future. Check all of them out here on SoundCloud, or here on iTunes.
The 19th Hole is hosted by Michael Williams, who was the PGA Mediaperson of the Year in 2014 and is a longtime titan in both golf media and radio in general; he has produced and hosted shows on CBS Radio, Fox Sports Radio and Voice of America. Michael is a true professional, knowledgeable golfer, and knows how to conduct one heck of an interview. So far on the show, his guests have included Greg Norman, Bob Vokey, Rees Jones, Robert Trent Jones Jr., Scott Van Pelt, Byron Scott, Michael Breed, Louis Oosthuizen, Jim Nantz, Roger Cleveland, Mike Taylor, and many more.
Two Guys Talkin’ Golf (TG2), is hosted by equipment expert Brian Knudson and myself, a former Division I golfer and GolfWRX Editor. Together, we discuss all things golf, but mostly focus on golf equipment… and the occasional hot take. TG2 welcomes guests on the show as well, ranging from GolfWRX forum members to club builders to Tour professionals to caddies. If you’re hungry for more equipment knowledge and high-level golf conversation, TG2 is your type of podcast.
The third, and all-new podcast, is called “Gear Dive,” hosted by Johnny Wunder. What you can expect is a weekly podcast where Wunder interviews anyone who’s anyone “in the know” of golf equipment… and he’s going deep. To give you an idea, his first guest was legendary clubmaker Larry Bobka who made Tiger Woods’ old Titleist irons.
Also, as I discussed before, GolfWRX is great with telling stories via the written word. To make sure we continue to do so, we’ve hired Ben Alberstadt who’s been writing for GolfWRX for over 5 years now. He was previously a freelance journalist who worked with a variety of media and news outlets, and he now wears the GolfWRX hat full time. I cannot be more excited to have him aboard the ship because he’s a true, hard-working journalist and he’s great at telling a story in his own unique style. If you’ve read any of his stuff, you know what I mean.
And as for me, I promise to continue providing GolfWRX readers with the content they want and need to read/hear/see on a daily basis. It’s my duty to help our readers be the most knowledgable golfers and golf buyers, and be entertained while learning more about the sport we all love. I simply love GolfWRX and our readers/listeners/viewers, and I want you to have the best website of all time to visit every day… a website to be part of and proud of.
What do I ask from you GolfWRX readers? Your feedback! If we write a bad story, tell us why you think it’s bad. If we publish a video you like, tell us why in the comments or on social media. If you love the new podcast, tell us that you loved it and support by subscribing. (If you want all of our podcasts transcribed, we’re working on it!) We want to have the best website in the world, and we want to provide information to golfers in the way they want to consume it. We care deeply about your opinion. GolfWRX began as a forum community, and we will always be a community. Personally, I was a GolfWRX reader myself before ever writing for the site. So was Alberstadt and Williams and Knudson and Wunder. We love golf and we love GolfWRX. We want to see it thrive, and you, the readers, are a huge part of that success.
Anyway, thanks for taking the time to read this letter, and I hope you continue to be a GolfWRX reader and participant. And if you do, make sure to tell your golfing buddies how much you love the site… in real life or on social media. The more we grow, the better stories and podcasts and videos we can create. I love and appreciate the opportunity to be your GolfWRX Editor, and I won’t let you down!
Hit em between the tree line,
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