Equipment
How the idea of shaft frequency began
Forty years ago, Kim Braly and his father Dr. Braly went down to West Palm Beach to visit Wilson Golf, and that trip forever changed the way the golf industry thinks about the shafts in golf clubs.
“My father and I invented frequency matching,” Kim told me.
“And what’s that?” I asked.
“It’s the process of matching the stiffness of the shafts in your clubs to the heads so you can hit a golf ball rather than snap the shaft or hit the ball all over the place,” Kim said.
OK, that got my attention. So I ask how he stumbled upon the idea.
“My dad was an engineer and got into golf,” Kim said. “Eventually, I got interested in golf as well. In the early 1980s, we went to see the original ‘Iron Byron.’”
A modern-day golf robot at Titleist’s Manchester Lane Test Facility.
Iron Byron was the first club-testing machine, and it was modeled after smooth-swinging legend Byron Nelson. It’s basically an early robot — a motor in a box with an arm — built to use a regular golf club to hit a golf ball.
Kim and Dr. Braly watched the engineer operating Iron Byron put a club into the mechanical arm, place a ball in front of the club face and then press a button to swing the club. The result: perfection. It produced a high, piercing ball flight that was hit on a rope, not far removed from the storied ball flight of Nelson himself. This was followed by another and another. Kim and his father were ecstatic.
With great anticipation, they watched the engineer load the next club. The results were much different. Balls flew all over the place. The dispersion was awful. The Wilson engineer operating Iron Byron slowed down the machine. Balls flew shorter distances, but they landed closer together. The dispersion had been reduced. This was the inception of their game-changing idea; dispersion was a result of certain shaft characteristics matched with a club head and swing speeds. This “AH HA” moment changed how we fit and purchase golf clubs today.
Based on this observation, Kim and Dr. Braly designed a method to measure the performance of a golf shaft. Later, this led to the concept of frequency: very simply, stiffness is not the letter on the shaft, but a measurement based on characteristics like weight of shaft, weight of the head, length of the shaft and several other characteristics. The year was 1977 and they submitted a patent on this idea called “Frequency Matching.”
Armed with the power of measurement, Kim was ready to change golf shafts forever. He and his father started traveling the PGA Tour, and in doing so became the first “PGA Tour Van.” Over the last 40 years, Kim has worked as a researcher and designer, mastering the golf shaft. He’s worked at True Temper, Royal Precision and is currently as the head designer of research and development at KBS Golf Shafts.
Kim working with a player on his golf equipment.
In 2008, Kim launched a shaft company called KBS, which became the fastest growing shaft company in golf. Since that time, the company has gotten some of the best golfers in the world to use its shafts products, including Rickie Fowler, Justin Rose and Phil Mickelson.
The next time you’re struggling with shots that fly sideways, think about Kim and Dr. Braly. You might want to try try being fit for shafts if you haven’t already, because they may just be the most important part of your golf club.
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- Kevin Tway what’s in the bag accurate as of the Wells Fargo Championship. More photos from the event here.
Driver: Ping G430 LST (10.5 degrees)
Shaft: Fujikura Ventus Black 6 X
3-wood: TaylorMade Stealth 2 (15 degrees)
Shaft: Mitsubishi Diamana D+ 80 TX
5-wood: TaylorMade Stealth 2 (18 degrees)
Shaft: Mitsubishi Diamana D+ 90 TX
Irons: Wilson Staff Utility (2), Titleist T100 (4-9)
Shafts: Mitsubishi MMT 100 TX (2), True Temper Dynamic Gold Tour Issue X100 (4-9)
Wedges: Titleist Vokey Design SM10 (48-10F @47, 52-12F @51, 56-14F), SM7 (60-10S)
Shafts: True Temper Dynamic Gold Tour Issue X100 (48-56), True Temper Dynamic Gold Tour Issue S400 (60)
Putter: Scotty Cameron T-5 Proto
Grip: Scotty Cameron Black Baby T
Grips: Golf Pride Tour Velvet Plus4
More photos of Kevin Tway’s WITB in the forums.
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Editor’s note: This is an excerpt from a piece our Andrew Tursky originally wrote for PGATour.com’s Equipment Report. Head over there for the full article.
The timing of Lowry’s putter changeup was curious: Was he just using a Spider putter because he was paired with McIlroy, who’s been using a Spider Tour X head throughout 2024? Was Lowry just being festive because it’s the Zurich Classic, and he wanted to match his teammate? Did McIlroy let Lowry try his putter, and he liked it so much he actually switched into it?
Well, as it turns out, McIlroy’s only influence was inspiring Lowry to make more putts.
When asked if McIlroy had an influence on the putter switch, Lowry had this to say: “No, it’s actually a different putter than what he uses. Maybe there was more pressure there because I needed to hole some more putts if we wanted to win,” he said with a laugh.
To Lowry’s point, McIlroy plays the Tour X model, whereas Lowry switched into the Tour Z model, which has a sleeker shape in comparison, and the two sole weights of the club are more towards the face.
Lowry’s Spider Tour Z has a white True Path Alignment channel on the crown of his putter, which is reminiscent of Lowry’s former 2-ball designs, thus helping to provide a comfort factor despite the departure from his norm. Instead of a double-bend hosel, which Lowry used in his 2-ball putters, his new Spider Tour Z is designed with a short slant neck.
“I’ve been struggling on the greens, and I just needed something with a fresh look,” Lowry told GolfWRX.com on Wednesday at the 2024 Wells Fargo Championship. “It has a different neck on it, as well, so it moves a bit differently, but it’s similar. It has a white line on the back of it [like my 2-ball], and it’s a mallet style. So it’s not too drastic of a change.
“I just picked it up on the putting green and I liked the look of it, so I was like, ‘Let’s give it a go.’”
Read the rest of the piece over at PGATour.com.
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Equipment
Webb Simpson equipment Q&A: Titleist’s new 2-wood, 680 blade irons, and switching to a broomstick Jailbird
With seven career wins on the PGA Tour, including a U.S. Open victory, Webb Simpson is a certified veteran on the course. But he’s also a certified veteran in the equipment world, too. He’s a gearhead who truly knows his stuff, and he’s even worked closely with Titleist on making his own custom 682.WS irons.
On Wednesday at the 2024 Wells Fargo Championship, I caught up with Simpson to hear about his experience with Titleist’s new prototype 2-wood, how Titleist’s 680 Forged irons from 2003 ended up back in his bag, and why he’s switching into an Odyssey Ai-One Jailbird Cruiser broomstick putter this week for the first time.
Click here to read our full story about Simpson’s putter switch on PGATOUR.com’s Equipment Report, or continue reading below for my full Q&A with Simpson at Quail Hollow Club on Wednesday.
See Webb Simpson’s full WITB from the 2024 Wells Fargo Championship here
GolfWRX: It seems like you’ve been a little all over the place with your irons in the past six months or so, and now going back to the 680’s. Is that just a comfort thing? What’s been going on with the irons?
Webb Simpson: Titleist has been so great at working with me, and R&D, on trying to get an iron that kind of modernizes the 680. And so the 682.WS took the T100 grooves, but kinda took the look and the bulk and the build of the 680’s into one club. They’re beautiful, and awesome looking. I just never hit them that well for a consistent period of time. It was probably me, but then I went to T100’s and loved them. I loved the spin, the trajectory, the yardage, but again, I never went on good runs. Going through the ground, I couldn’t feel the club as well as with the blade. So last week, I’m like, ‘Alright. I’m gonna go back more for…comfort, and see if I can get on a nice little run of ball striking.’
So that’s why I went back.
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OK, that makes sense. I know you had done some 2-wood testing recently. Is that in the bag right now?
It’s like day-by-day. I used it at Hilton Head every day. Valero, I used it one round. And this week, me and my caddie will do the book every morning, and if it’s a day where we think we need it, we’ll just put it in and take the 3-wood out. I love it because it’s a super simple swap. Like, it doesn’t really change much.
Yeah, can you tell me about that club? I mean, we don’t really know anything about it yet. You know? I haven’t hit it or anything, obviously.
It has grooves like a 3-wood. Spin is perfect. And it’s honestly, like, everything is in the middle of a 3-wood and driver number. Trajectory, spin, carry, all of it. So, a Hilton Head golf course is almost too easy to talk about because, you know, there, so many holes are driver 3-wood.
Valero, our thinking was we had two par-5’s into the wind, and we knew that it would take two great shots to get there in two. So instead of hitting driver-driver, we just put it in. And I used it on those holes.
Hilton was a little easier because it was off-the-tee kind of questions. But Colonial will be a golf course where, you know, there’s a lot of driver or 3-woods. It’s kind of like a backup putter or driver for me now. I’ll bring it to every tournament.
So it’s, like, in your locker right now, probably?
Well, it would be. It’s in my house [because Webb lives near by Quail Hollow Club, and is a member at the course.] It’s in the garage.
Oh, yeah, that’s right. Do you know what holes you might use it out here if it goes in play?
Potentially 15, depending on the wind. Second shot on 10. Could be 14 off the tee. The chances here are pretty low (that he’ll use the 2-wood). But, like, Greensboro would be an awesome club all day. I’m trying to think of any other golf courses.
There’s plenty that it’ll be a nice weapon to have.
It’s interesting, the wave of 2-woods and mini drivers. Like, it’s just really taken off on Tour, and all the companies have seemed to embrace it.
Yeah. The thing I had to learn, it took me, like, at least a week to learn about it is you gotta tee it up lower than you think. I kept teeing it up too high. You need it low, like barely higher than a 3-wood. And that was where I got optimal spin and carry. If you tee it up too high, you just don’t get as much spin and lose distance, I don’t know if that’s just a mini driver thing.
And you obviously have a Jailbird putter this week. What spurred that on?
Inconsistent putting. I’m stubborn in a lot of ways when it comes to my equipment, but I have to be open minded – I just hadn’t putted consistently well in a while. And I’m like, ‘Man, I feel my ball-striking coming along. Like I feel better; for real, better.’
If I can just get something in my hands that I’m consistent with. Being on Tour, you see it every year, guys get on little runs. I can put together four to five tournaments where I’m all the sudden back in the majors, or in the FedExCup Playoffs. You can turn things around quick out here. I’m like, ‘Man, whatever’s going to get me there, great.’
My caddie, David Cook, caddied for Akshay at the Houston Open and he putted beautifully. Then, I watched Akshay on TV at Valero, and he putted beautifully. And, I’m like, ‘I’m just going to try it.’
I’ve never tried it for more than a putt or two, and I just ordered what Akshay uses. It was pretty awkward at first, but the more I used it, the more I’m like, ‘Man, it’s pretty easy.’ And a buddy of mine who’s a rep out here, John Tyler Griffin, he helped me with some setup stuff. And he said at Hilton Head, he wasn’t putting well, then tried it, and now he makes everything. He was very confident. So I’m like, ‘Alright, I’ll try it.’”
And you’re going with it this week?
Hundred percent.
Alright, I love it. Thank you, I always love talking gear with you. Play well this week.
Thanks, man.
See Webb Simpson’s full WITB from the 2024 Wells Fargo Championship here
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TeeBone
Jun 7, 2017 at 5:34 pm
Further, frequency matching a set doesn’t mean that the clubs all have the SAME shaft flexibility, only that the DIFFERENCE in flexibility is uniform from club to club. As the clubs get shorter, frequency and stiffness increase. Add to this the fact that as the clubs get shorter and heavier, they are swung at a slower speed. In the end, each shaft in a set flexes more and more overall as the clubs get longer. This silly “dispersion” theory suggests that a shaft must flex a specific amount to behave consistently.
TeeBone
Jun 7, 2017 at 2:39 pm
Tour players, unless they have a specific shaft manufacturer deal, are free to play whatever shaft they want. Their decision to play graphite over steel has to do with performance, not money.
TeeBone
Jun 7, 2017 at 2:27 pm
So Iron Byron, set at any particular swing speed, only reproduces the same ball flight with one specific shaft flex? This “dispersion” theory would mean that the same shaft can behave quite differently, from swing to swing, for an otherwise same swing input. Nonsense. There is no mention of this in any of the best-regarded scientific studies of shaft flexibility. This is a made-up marketing story designed to sell equipment.
Ned
Jun 6, 2017 at 8:06 am
Brunswick Golf developed the Frequency Matching System in 1981!
Rico
Jun 6, 2017 at 4:04 pm
The article states that the Braly’s submitted a patent for “Frequency Matching” in 1977.
J.
Jun 5, 2017 at 7:15 pm
And stiffness of an EI profile may be invisible to CPM matching? Does SST PURE shaft alignment work better?
Skip
Jun 7, 2017 at 1:18 pm
SST pure is pure Kool-Aid. Drink it if you so choose.
tim crider
Jun 5, 2017 at 4:05 pm
There is no doubt that shots can be saved every round by every player with changes from the shaft to the swing weight to the compression of your golf ball,,, hell practicing on the driving range could improve your game. There is a lot to know about this game and if you have the money and the time you may be able to cash in on these findings. Think how much better play got when shafts changed to steel from hickory. A lot to know and even more to learn. How much more can be found and improved, it was a very good article.
Charles Bartholomew
Jun 5, 2017 at 3:38 pm
Interesting article. A little history lesson now and then is a good thing.
cgasucks
Jun 5, 2017 at 8:20 am
If the Iron Byron can make crappy shots with a shaft that isn’t compatible with its swing speed, imagine it with a human being.
talljohn777
Jun 5, 2017 at 12:14 pm
Yes, if you have a club shaft that is too soft you can slow your swing down to allow the clubhead time to catch up and square, but why would you want to do that? The preference would be to hit a club that matches your top swing speed allowing you to get the most out of your swing.
artie j
Jun 5, 2017 at 6:59 am
I didn’t know the backstory. Very cool article Ryan
SH
Jun 4, 2017 at 10:25 am
Yup, awesome