The XR drivers are all about speed. Everything Callaway have put into the the design is to increase speed making it their fastest Titanium driver ever.
Speed comes from all areas of the golf club and Callaway have focussed their efforts from club head aerodynamics to speed across the whole face in making the XR driver a worthy successor to the popular X2 Hot.
Speed Step Crown
Aerodynamics are key to increasing club head speed in the swing and Callaway have introduced the new Speed Step Crown in the XR.
Visually striking the Speed Step optimises the head for aero efficiency by reducing drag and video of the performance in the wind tunnel clearly shows the head moving through the air more efficiently, especially across the toe area and Callaway claim that the XR drivers is 2.3 mph faster than the X2 Hot driver which should equate to around 5-10 yards.
The speed from the re-designed head is complemented by Callaway's use of the Project X LZ shaft as the stock option for the XR. Project X have developed these shafts to produce maximum shaft load during the the downswing loading zone, maximising the speed and energy transfer to the ball.
R MOTO Face
Creating speed is one thing but translating that to the golf ball is the key to distance and this is where Callaway's RMOTO face technology comes to the fore.
First seen in Callaway's Big Bertha Alpha 815 the XR driver incorporate's Calllaways' RMOTO face tecnhology that delivers brings benefits to the club in terms of both performance and forgiveness.
RMOTO is based in the design insights from the face cups used in Callaway's fairway woods and hybrids where the focus is on controlling the area immediately around the perimeter of the club face. Face cup technology cannot be applied to drivers given the difference in the face aspect ratio compared to fairways and hybrids heads, so in order to change the stiffness of the boundary of the face RMOTO was developed.
RMOTO - meaning ribs for motion control - uses discrete ribs to connect the face and the sole and the face and the crown to produce an area next to the face that is lighter and more flexible than would have been the case from a titanium shell. This allows Callaway to control the motion of the face to improve ball speed particularly in the areas around the edge of the face and off centre impact locations used by a lot of average golfers.
Compared to the X2 Hot the RMOTO face in the XR driver has resulted in 10% less weight, a 9% increase in MOI and has allowed Callaway to lower the Centre of Gravity by 17% making the driver both faster and easier to hit.
As with the majority of Callaway's metal woods the XR driver features the OptiFit hosel which gives players 8 options of lie and loft to ensure that launch conditions are precisely dialled into their game to correctly harness the increased speed of the XR driver.