Callaway GBB Epic Sub Zero
Lofts: 9°, 10.5° Stock shafts: Project X HZRDUS T800, Fujikura Pro Green, Aldila Rogue Max. Adjustable hosel: Yes How much loft change: +2°/-1° Contact: www.callawaygolf.com
Jailbreak technology sees two titanium rods connect the crown to the sole behind the face, which Callaway says stiffens the head to boost ball speeds. An exo-cage body structure is paired with a carbon crown and sole. 12g and 2g sole weights can be interchanged to lower spin or increase launch.
Callaway says “jailbreak” technology can add 3mph of ball speed to anyone’s game, and the fact that Rory has put a Sub Zero into play when he’s not getting paid to use one is a very good endorsement. It’s important to understand that the Sub Zero (with its 12g weight in the back port) has a higher MOI than the standard Epic driver, which means more forgiveness even though its neutral centre of gravity means it’s slightly harder to launch shots, particularly at lower swing speeds. Its footprint looks a fraction larger than the standard Epic at address, but our testers were split over the busy crown cosmetics and which Epic was best suited to them. Our two amateurs recorded their longest average carry distances with the Sub Zero, while the average carry for all three was longest on test – by half-a-yard over the M2.