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  • What we say
  • What they say
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The GBB Epic Sub Zero driver can be described as a forgiving players driver. It’s jam-packed with technology and introduces some new innovations such as Jailbreak Technology and the Triaxial weave. Jailbreak is Callaway’s way of getting you out of jail (mishits) hence the name. They have pushed the boundaries of production exceeding legal limits before bringing them back to a conforming status using Jailbreak Technology. This is achieved by connecting the crown and the sole of the driver with rigid titanium rods. These rods make the face react more lively without losing energy through flexing in the sole or crown. The end result is more speed off the face and lots more forgiveness. Their new Triaxial weave is a further evolution of the well-known Fusion Technology and allows them to make the crown and sole even thinner and lighter than before. The saved weight is redistributed to increase the driver’s MOI/forgiveness. In testing, we found a definite ball speed increase over the previous model, similar launch values and a decreased spin rate. This resulted in the GBB Epic being slightly longer than the Great Big Bertha. The increased forgiveness did however stand out thanks to Jailbreak Technology.
The Sub Zero model shares all the new technologies such as Jailbreak and the Triaxial Weave. There is however no APW (Adjustable Perimeter Weighting) as seen in the standard Epic, nor is there a Gravity Core as seen in previous generations. Callaway have opted instead for 2 weight ports in the front and rear of the sole which we found works better than the previous Gravity Core and is much easier to understand. When the heavy weight is at the back, it’s a higher launching driver with more spin. With the weight forward, it produces a more penetrating launch with roughly 500RPM’s less spin.
In testing, we found the Sub Zero to be superior in ball speed with slightly reduced spin rates. We saw virtually no change in launch angles and all of these factors combined for a slight distance gain. The level of forgiveness impressed us most with Jailbreak changing the game as we know it.
We recommend this for stronger lower handicap players due to the low spin. A mid-to-high handicap struggling with lots of spin could also use this driver if fitted correctly.

The Callaway Great Big Bertha Epic Sub Zero driver replaces the Big Bertha Alpha 816 Double Black Diamond driver from 2016. This latest low spin model features a revolutionary new Jailbreak technology that produces more consistency and distance across the entire face. A different type of adjustability and selection of stock shafts ensures even more precise custom fitting. This is a better players club for those with very fast swing speeds.

Features:
- Increased Distance from Jailbreak Technology
- Titanium Exo Cage and Triaxial Carbon Construction
- Fast Head Speed
- Industry Leading Aerodynamics
- Adjustable Perimeter Weighting
- Precision Shot Shape Control

Product code: 4000757

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