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Three Callaway GBB Epic drivers appear on USGA Conforming Club List

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Three new Callaway drivers have appeared on the USGA’s Conforming Club List: the GBB Epic, the GBB Epic Star and the GBB Epic Sub Zero.

Callaway isn’t commenting on the new Great Big Bertha (GBB) drivers at this time, so we can’t officially confirm or deny any details about the new drivers. We do anticipate that one or more of the driver models could be in play this week at the Hero World Challenge in the Bahamas, however, where they will be permitted for us. We also can point out a few things based on the USGA’s black-and-white photos.

GBB Epic

Callaway_GBB-Epic

GBB Epic Star

8_Nov_mono02

Based on the photos, it appears the GBB Epic and GBB Epic Star are virtually identical, with the exception being the lack of an adjustable hosel on the GBB Epic Star.

Both drivers appear to use a technology called “Jailbreak,” which is highlighted on the front of the driver’s sole. The technology is rumored to connect the sole and crown of the drivers, adding reinforcement that improves energy transfer.

On the other end of the sole is a sliding weight that enables golfers to select a draw, fade or neutral trajectory bias. There are also what seem to be carbon fiber inserts on the soles of all three driver models. Carbon fiber is lighter than titanium, and its use presumably enhanced the ability of Callaway engineers to optimize the weighting of the driver heads for improved performance.

GBB Epic Sub Zero

Callaway_GBB_Epic_Sub_Zero

Instead of a sliding weight track, the GBB Epic Sub Zero has two adjustable weights — one on the front of the sole, and one on the back. That reminds us of Callaway’s XR ’16 Sub Zero driver, which is the company’s current ultra-low-spin driver. It design targets better golfers, and was used in 2016 by Phil Mickelson.

The Sub Zero got its name from its center of gravity position (CG), which Callaway says is below the neutral axis line, or “sub zero.” The XR ’16 Sub Zero uses a what Callaway called a Carbon Triax Crown, an extremely thin, lightweight composite material on the top of the driver that the company said enabled its sub zero CG location.

What are GolfWRX Members saying about the new drivers? Join the discussion in our forum. 

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18 Comments

18 Comments

  1. westphi

    Dec 4, 2016 at 12:56 pm

    When is this going to be released in stores?

  2. Red Regal

    Nov 29, 2016 at 6:42 am

    Callaway the new Taylor Made with so many releases.

  3. PapaBear

    Nov 29, 2016 at 2:46 am

    Haven’t been this excited since the Cobra 370U was released!

  4. KJ

    Nov 28, 2016 at 9:02 pm

    A lot of the comments, so true. I buy a new driver amount every 3 years. I typically buy a model that’s one year old and half the price of the original in very good shape.

  5. erlybrd

    Nov 28, 2016 at 6:27 pm

    What? Looks just like 915 D4 head!!

  6. Blade Junkie

    Nov 28, 2016 at 3:31 pm

    Another bottle of Snake Oil please Bartender !

  7. B. Parsons

    Nov 28, 2016 at 1:16 pm

    The Korean YouTube video showed these in detail. I’m sure cally will try their best to have it pulled, but it’s still out there. Search for it on naver or another Korean search engine.

  8. Dave R

    Nov 28, 2016 at 12:21 pm

    What I can’t believe it more new drivers, what will they think of next

  9. Jordan

    Nov 28, 2016 at 11:14 am

    Wait, they’re coming out with an adjustable 915 driver? Color me intrigued…

  10. Clay

    Nov 28, 2016 at 10:30 am

    I can’t believe no one has speculated that the bonded hosel design was made for Tiger. Are the “Tiger is buying TM” rumors so strong that no one wants to start a new rumor about Tiger signing with Callaway? Fine, I will start the rumor. The GBB Star is made specifically for Tiger and will not go to market. I have zero evidence but I know some people that know some people that robbed some people and they said it is true.

  11. Michael

    Nov 28, 2016 at 9:33 am

    The Epic Star has my attention. Will this be a non-adjustable model that is in the $399 range? Would they want to compete with possible Fusion sales?

  12. cgasucks

    Nov 28, 2016 at 9:04 am

    Jailbreak technology!??! What is that?? Does it mean if you pay someone to “unlock” it you remove the USGA COR restriction!??!

    • Desmond

      Nov 28, 2016 at 9:23 am

      You need to read the EPIC thread

      • Desmond

        Nov 28, 2016 at 9:24 am

        … or just the descriptions above. Works wonders.

  13. Fozzie Bear

    Nov 28, 2016 at 8:50 am

    Oh, Mizuno Fast Track is back. 🙂

    • DB

      Dec 2, 2016 at 12:49 am

      Man, I just saw a Mizzy Fast Track at GolfMart for like $30.
      If Callaway says this technology is a game changer then I’m going back to get that Mizuno tonight!

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Equipment

Q&A: Martin Trainer on his Bobby Grace “Greg Chalmers” putter, 6.5-degree driver, and “butter knife” 2-iron

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As unbiasedly as I can put it, Martin Trainer has one of the coolest club setups in professional golf. (At some point soon, I’ll put together a top-10 list of “coolest club setups on Tour,” but I know that Trainer will be in the top-10)

What a lineup. He plays a 6.5-degree Wilson prototype driver, a 13-degree Wilson prototype 3-wood, a true blade Wilson Staff Model 2-iron, and a Bobby Grace “Greg Chalmers Commemorative” putter!

 

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I mean, look at this 2-iron from address…

To quote the great author R.L. Stine: “Goosebumps.”

On Wednesday at the 2024 Texas Children’s Houston Open, I caught up with Trainer to learn more about his bag setup.

Here’s what he had to say:

You have the Internet going crazy over your bag setup, and your putter. Where’d you pick the Bobby Grace-Greg Chalmers putter up? How long have you had it?

MT: This was from when Bobby Grace came to my course in California: Cal Club. And for whatever reason, they just started having them in the shop. So then I took my buddy’s, started using it, and made, like, a million putts in a row, which is how every putter story begins, I guess.

And then, I bought a couple of my own, used it for years, got to the Tour with it, won on Tour with it (the 2019 Puerto Rico Open). Then, about a year later, started using another putter, did that for a couple years, but now it’s back in the bag.

When did it come back in the bag?

MT: December of this past year. So a few months ago.

What year would you say was the first time you threw that in the bag, or, like, when you bought it?

MT: God…Probably, 2016, maybe? 2018?

Do you remember how much you paid for it?

MT: I don’t know, actually. Maybe $100-150 bucks or something. I think that’s the only golf club I’ve bought between high school and now. Well, two, since I bought two of them.

The driver is interesting, too. What went into the prototyping process?

MT: That was a version of the current driver, but it was the prototype that they first came out with for Tour guys to try. And for whatever reason, I just never switched out to the new one.

It’s just 6.5 degrees, right?

MT: Yeah. Very low loft, yeah.

What kind of ball speed do you have with that these days?

MT: Like high 170’s.

Yeah, that’ll work. And then a 2-iron blade? We’re seeing fewer and fewer of those out here.

MT: Yeah. The butter knife.

Very cool thing to have in the bag. Have you done any testing with driving irons? 

MT: Yeah, I used to have a thicker one, but it was a little offset, and I never hit it that well. And then finally, I started messing around with the butter knife. And I remember the first time I looked down at it, I was terrified. And then I ended up getting used to it, putting it in play, and it’s been in place since. It’s a pretty good club for me.

How far do you carry that? 

MT: Like 235.

A good little wind club, I’m sure.

MTL Yeah, exactly. I can hit it very low. It’s great.

I love it. You have people shook looking at that. Thanks for the time, man. 

MT: Absolutely.

To see more photos and discussion of Trainer’s bag, click here.

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Coolest thing for sale in the GolfWRX Classifieds (3/28/24): L.A.B. Golf Mezz.1 Max Broomstick with LA Golf Paige Spiranac shaft

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At GolfWRX, we are a community of like-minded individuals that all experience and express our enjoyment of the game in many ways.

It’s that sense of community that drives day-to-day interactions in the forums on topics that range from best driver to what marker you use to mark your ball. It even allows us to share another thing we all love – buying and selling equipment.

Currently, in our GolfWRX buy/sell/trade (BST) forum, there is a listing for a L.A.B. Golf Mezz.1 Max Broomstick putter with LA Golf Paige Spiranac shaft.

From the seller: (@hibcam): “L.A.B. GOLF Mezz.1 Max Broomstick- LA Golf Paige Spiranac Shaft- 44″/79.5. Brand new, never used brown leather cover. The head was professionally anodized from Orange to Blue (Orange looked bad with the Pink shaft so I had it changed). Only a few rounds on this combo. Please see last pic- slight ding on back corner. 8.5-10 condition. THE SHAFT COST $475/ THE PUTTER $625. $799 shipped in the US. ONLY $699 SHIPPED.”

To check out the full listing in our BST forum, head through the link: L.A.B. Golf Mezz.1 Max Broomstick with LA Golf Paige Spiranac shaft

This is the most impressive current listing from the GolfWRX BST, and if you are curious about the rules to participate in the BST Forum you can check them out here: GolfWRX BST Rules

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Spotted: Tony Finau’s driver shaft change at the 2024 Texas Children’s Houston Open

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Tony Finau has always been known as one of the longest players on the PGA Tour, but he has recently been working on adding a little more distance. Last year, Finau averaged 118.3 mph club head speed and 178.08 mph ball speed, all while playing a Mitsubishi Diamana D+ Limited 70 TX driver shaft. This year, he has increased his club head speed to 123.93 mph and his ball speed to 183.32 mph.

However, Finau’s overall distance has decreased by two yards in that time. From a fitting perspective, something was amiss. We asked Tony about the shaft change at the Texas Children’s Hospital Open.

“[I’m seeing] better numbers with the spin. My driver’s been a little high spin for me over the last month or so, and so I just figured it was time to probably check out the equipment,” Finau said. “And it definitely showed me that I was using a shaft that’s maybe a little too tip-stiff for me, the way I load the club now. [I’m seeing] better numbers with the spin.”

Finau switched from the Mitsubishi Diamana D+ Limited 70 TX into the Diamana GT 70 TX. The newer Diamana GT has a slightly different profile than the D+ Limited with the stiffest handle section in the Diamana lineup. The mid sections between the two are similar stiffness but the tip is just slightly stiffer in the Diamana GT. Both shafts are within one gram of each other in the 70 TX. The torque rating on the GT is 0.1 higher than the D+Limited’s 2.7 measurement.

Mitsubishi lists the Diamana GT as a shaft between the mid-launching Diamana TB and the new low-launch Diamana WB shafts. For most players, it would be considered a mid/low launch and low-spin shaft option. Mitsubishi’s Xlink Tech Resin System makes sure the maximum carbon fiber content is there for smooth feel without reducing the strength of the shaft. MR70 carbon fiber is used for reinforcing the shaft and boron is used in the tip for its high strength and compression properties.

Finau is still using his trusty Ping G430 LST driver in 9 degrees and has the adjustable hosel set to -1 degree of loft (standard lie angle). Finau’s long-time favorite Lamkin UTX Green grip is installed. He definitely has a few extra wraps of tape under that grip as you can see the bulge down where the grip meets the shaft.

One final note: Per Ping’s PGA Tour rep Kenton Oates, Finau’s driver is also adjusted to play with an additional degree of loft to help dial in his desired launch.

We’ll see how he fares with the new setup this week in Houston!

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