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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

Billy Horschel’s winning WITB: 2021 BMW PGA Championship



  • Billy Horschel what’s in the bag accurate as of the BMW PGA Championship 

Driver: Titleist TSi3 (9 degrees)
Shaft: Project X EvenFlow Riptide 60 6.5 TX

3-wood: Titleist TSi2 (15 degrees)
Shaft: Project X HZRDUS Smoke Black 70 6.5 TX

(Image c/o SMS_on_Tour)

5-wood: Titleist TSi2 (18 degrees)
Shaft: Project X HZRDUS Smoke Black 80 6.5 TX

Irons: Titleist 620 CB (3), Titleist 620 MB (5-PW)
Shafts: True Temper Dynamic Gold Tour Issue X100

(Image c/o SMS_on_Tour)

Wedges: Titleist Vokey Design SM8 (52-12F, 56-10S, 60-08 V (@ 62))
Shafts: True Temper Dynamic Gold Tour Issue Onyx S400

(Image c/o SMS_on_Tour)

Putter: Ping Sigma 2 Tyne 4

(Image c/o SMS_on_Tour)

Ball: Titleist Pro V1

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Whats in the Bag

Francesco Laporta WITB 2021 (September)



Driver: Titleist TSi3 (9 degrees)
Shaft: Project X HZRDUS Smoke Green

3-wood: Titleist TS3 (15 degrees)

Hybrid: Titleist TSi3 (19 degrees)

Irons: Titleist U500 (3, 4), Titliest T100 (2021) (5-PW)

Wedges: Titleist Vokey Design SM8 (52-08M, 58-10S)

Putter: Scotty Cameron T 11.5 Prototype

Ball: Titleist Pro V1

Image courtesy of sms_on_tour

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Whats in the Bag

Adam Scott WITB 2021 (September)



  • Adam Scott’s what’s in the bag accurate as of the BMW PGA Championship. 

Driver: Titleist TSi4 (9 degrees, A2 SureFit setting)
Shaft: Graphite Design Tour AD DI

Photo via SMS_on_Tour

3-wood: Titleist TSi2 (16.5 degrees, A1 SureFit setting)

Photo via SMS_on_Tour

7-wood: Titleist TSi2 (21 degrees)

Irons: Titleist 680 (4-9)
Shafts: KBS Tour 130 X

Photo via SMS_on_Tour

Wedges: Titleist Vokey Design SM8 (48-10F, 52-12F, 56.10S), Vokey Design SM8 WedgeWorks (60-06K)
Shafts: True Temper Dynamic Gold AMT Tour Issue X100

Photo via SMS_on_Tour

Putter: Scotty Cameron Xperimental Prototype Rev X11 (long)

Ball: Titleist Pro V1

Scott marks his ball with dots in the pattern of the Southern Cross, which is featured on the Australian flag.

Grips: Golf Pride Tour Velvet


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