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Three Callaway GBB Epic drivers appear on USGA Conforming Club List



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


GBB Epic Star


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


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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  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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Whats in the Bag

Trey Mullinax WITB 2023 (February)



Driver: Ping G430 LST (9 degrees)
Shaft: Project X HZRDUS Smoke Blue RDX 60 6.5

3-wood: Ping G430 MAX (15 @ 14)
Shaft: Project X HZRDUS Smoke Black RDX 80 TX

7-wood: Ping G430 MAX (21)
Shaft: Project X HRDUS Smoke Black RDX 80 TX

Irons: Srixon ZX (3), Wilson Staff Model CB (4-9)
Shafts: True Temper Dynamic Gold Tour Issue X100

Wedges: Wilson Staff Model (46-08, 52, 56), Titleist Vokey Design Wedgeworks Proto (60-T)
Shafts: True Temper Dynamic Gold Tour Issue S400

Putter: Scotty Cameron Prototype
Grip: Scotty Cameron

Grips: Golf Pride Tour Velvet Cord

More Trey Mullinax WITBs

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Coolest thing for sale in the GolfWRX Classifieds (2/6/23): TaylorMade P790 Ti Iron Set



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 TaylorMade P790 Ti Iron Set

From the seller (@TaylorMadehunter1): “Flat out set of rocket launchers. Set is 5-A and shafted with Project X 6.0 shafts. Lengths shown in pics. They look stunning in the bag, behind the ball, and have the performance to match! $850.”

To check out the full listing in our BST forum, head through the link: TaylorMade P790 Ti Iron Set 

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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TOUR REPORT: Jordan Spieth changes drivers, Josh Allen’s SICK putter, and Kisner’s new Wilson setup



Welcome to Monterey Peninsula, one of the most beautiful golf properties in the world, for the 2023 AT&T Pebble Beach Pro-Am.

In my opinion, this week is one of the most interesting weeks of the year for golf equipment entertainment. That’s because the field is stacked with celebrities who have varying levels of skill sets and industry access. Getting a peek at how the celebs setup their golf bags is intriguing and unpredictable; you just don’t know what kind of golf clubs you’ll find.

Also, Jordan Spieth, a celebrity in his own right in the golfing world, made a shocking driver change this week, and we got an awesome Arnold Palmer history lesson at Pebble Beach.

It was a packed week in the golf equipment world, so lets get right into this week’s Tour Report from the 2023 AT&T Pebble Beach Pro-Am.

Michael Pena is a gear head?

Actor Michael Pena, who’s a single digit handicap golfer, was testing out two different drivers – a Callaway Paradym and a Ping G430 – at the beginning of the week. By the time the event started, Pena opted for the Paradym. He was also testing out two different putters – a Bettinardi BB8 and BB8 Tri.

Testing out different clubs at the event to get as dialed as possible? Pena must be one of us.

Michael Pena 2023 WITB

Carlton’s saucy putter

Alfonso Ribeiro, best known for his role as Carlton in the Fresh Prince of Bel-Air, has been a longtime participant in the Pebble Beach Pro-Am, and he carries a low single digit handicap.

Ribeiro has fresh clubs almost through the bag, using Ping’s new G430 metalwoods and i230 iron models. He does, however, use an older Ping Sigma2 Tyne putter, which was released back in 2018. The putter is caked with lead tape on the sole, too, proving Ribeiro always does things with a touch of flair.

Alfonso Ribeiro 2023 WITB

Charles Kelley’s old flatstick


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Charles Kelley, a country singer and lead vocalist for the band Lady A, uses a TaylorMade Ghost Manta putter, which was first released in 2012. The paint job has certainly seen brighter days, but golf balls don’t care about the aesthetics of a golf club. If it works, it works, and Kelley says it hasn’t left the bag in three years.

Charles Kelley 2023 WITB

Kira’s 7-wood

Kira K. Dixon, a reporter for the Golf Channel and Miss America 2015, has an eclectic golf bag setup, highlighted by a Callaway Epic Max, which she equips with a Project X Cypher Fifty 5.5 shaft.

Kira Dixon 2023 WITB

Macklemore embraces bogeys

“Thrift Shop” rapper Macklemore isn’t the best golfer in the Pro-Am field, but his outfits are certainly some of the most eye-catching. The Seattle native actually has an entire lifestyle golf brand, called the Bogey Boys, which has a uniquely fun fashion style that also embraces bogeys on the scorecard. His “Bogey Boys” brand name is laser etched onto his custom TaylorMade P-790 irons.

Macklemore 2023 WITB

Amanda puts the mic down

Amanda Balionis Renner, a CBS Sports reporter, is usually the one asking golfers the questions. This week ahead of the event, however, she competed in celebrity challenges at The Hay, and we were able to get a look inside her club setup. She was spotted with all-new Callaway Maradym metalwoods, new Paradym irons, and a custom Odyssey Toulon putter with a white-and-green LA Golf shaft.

Amanda Balionis Renner 2023 WITB

Darius unveils a new PXG driver?

Unveiling unreleased golf club prototypes isn’t usually the norm for celebrity golfers, but who better to show off a new PXG Gen6 0311 XF driver than musician and PXG staffer Darius Rucker? Judging by the looks of Rucker’s Gen6, PXG has spread out the three weight ports to the outer perimeter of the soles, which is likely to add forgiveness to the design.

Darius Rucker 2023 WITB

Arnold Palmer’s $250k irons

Behind the first tee at Pebble Beach is a putting green, and surrounding that putting green is a line of golf shops with green awnings. One of those shops, called “Golf Links to the Past,” is filled with antique memorabilia and awesome stories to tell.

Along the back wall, a set of Arnold Palmer’s game-used irons is on display. In fact, they’re Palmer’s personal Wilson Staff Model Dyna-Powered custom irons that he used to win 14 times in 1960-61, including the ’60 Masters, the ’60 U.S. Open, and the ’61 Open Championship.

They’re selling for a cool $275,000 at Golf Links to the Past.

How did the store acquire the golf clubs, and why are they worth so much money? Click here for the entire story.

Another Arnie story you may not have known

Across the street from Pebble Beach’s clubhouse is the Pebble Beach Visitors Center, and it’s well worth a visit for anyone interested in the history of the golf course and the surrounding area. There’s gold nuggets all over the place inside. One that particularly caught my interest was the “Palmer on the Rocks” story told in the photo above.

Check out more photos and stories from Pebble Beach here

ScHoolboy Q – Wedge of the Year, ft. Callaway

ScHoolboy Q, a rapper who sings hits such as “Man of the Year” and “THat Part,” is an avid golfer with keen eye for fashion – check out his ski mask look on Wednesday for proof. He also covers up his golf clubs with stylish “Malbon Golf” headcovers, and he has an awesome blue-and-orange Callaway Jaws Raw wedge with a laser-etched Q on the back.

ScHoolboy Q 2023 WITB

Josh Allen’s insane Tour-Only Scotty Cameron


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NFL quarterback Josh Allen of the Buffalo Bills has a smooth-yet-powerful golf swing, and he also has one of the coolest gear setups of any player in the Pro-Am field. In the video interview with above, Allen shows off his Jordan sneaker putter cover, ultra-custom Scotty Cameron putter, and a new TaylorMade Stealth 2 driver.

Click here for more Josh Allen WITB photos, and check out our full story on Allen’s clubs over on

Jordan Spieth’s shocking driver change

Photo Credit: PGA TOUR

For the last several years, Spieth has mostly opted for Titleist’s TSi3 driver. He had a brief stint with Titleist’s new TSR3 driver model at the 2022 Travelers Championship, but he’s struggled to upgrade from his trusty TSi3.

This week, however, ahead of the 2023 AT&T Pebble Beach Pro-Am, Spieth began experimenting with the Titleist TSR2 model, instead of the TSR3. Working with Titleist tour rep J.J. Van Wezenbeeck, Spieth found the TSR2, set in the D-1 hosel setting, was able to keep his spin numbers more consistent and provide greater forgiveness when hitting shots of varying trajectories and shot shapes.

On this week’s PGA Tour Equipment Report, we went in-depth on Spieth’s surprising driver change: Take a read here

A look at Camilo Villegas’ golf club lofts

Villegas has Srixon’s new ZX7 MKII irons in the bag, but his lofts are far from stock. Since Villegas writes his club lofts inside the back cavities, we can see his 7-iron is lofted at 36 degrees, which is 4 degrees weaker than the stock 32-degree iron spec. Interestingly, Villegas also plays one of the weakest driver lofts on the PGA Tour: a Titleist TSi3 11-degree head, although it’s in a C1 setting, which decreases it by 0.75 degrees.

Kevin Kisner’s new Wilson set

Kisner made one of the biggest off-season equipment switches on the PGA Tour, signing a new deal with Wilson for the first time in his career. This week at Pebble Beach, we got our first look at his equipment setup as a full-time Wilson staffer.

Check out his full setup: Kevin Kisner’s 2023 WITB

And, with that, we say goodbye to the beautiful cliffs of Pebble Beach. We’ll see you next week for “The Greatest Show on Grass” at the 2023 WM Phoenix Open in Arizona.

Click here to see all of our photos from Pebble Beach

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