The Mizuno ST-Max 230 is a high-MOI, ultra-stable driver.
Gear: Mizuno ST-Max 230 driver Price: $500 with Project X HZRDUS Smoke Green RDX, Mitsubishi Lai’ Li Blue or UST Mamiya Helium NanoCore 4F1 shaft and Lamkin ST Hybrid grip Specs: 460-cc head with a forged titanium face and chassis, carbon fiber crown and sole panels, and adjustable hosel. 9.5, 10.5 and 12-degree head options.
Who It’s For: Golfers who prioritize forgiveness and who want to hit straighter drives.
The Skinny: The new ST-Max 230 takes the weight saved by using a large carbon fiber crown and sole panel and redistributes it to the back of the head to boost the forgiveness and make the club Mizuno’s most stable driver.
The Deep Dive: Just as you can tell a lot about a man by the quality of his shoes and belts, you can tell a lot about a driver by observing where designers and engineers position weight in the head. Mizuno’s ST-G driver has more weight concentrated in the front, which helps it reduce spin and put an emphasis on ball speed. The Japanese company’s newest driver, the ST-Max, utilizes an entirely different design, materials and weighting concept, and the result, according to Mizuno, is its most stable and forgiving driver.
In the address position, the ST-Max 230 looks large, but clean with a glossy black tone covering the carbon fiber. (David Dusek/Golfweek)
In the address position, the ST-Max looks bigger and wider than the other ST drivers, even though its 460-cc size gives it the same volume as the ST-Z and ST-X drivers. It has a lower profile but is larger from heel to toe and from front to back, and when it comes to stability, bigger is better.
The key to increasing the moment of inertia (MOI) and making a club less likely to twist on off-center hits is to position more weight in the back of the head. To do that in the 460-cc ST-Max, Mizuno designed the club with a massive carbon fiber crown and increased the size of the carbon fiber sole panel. Replacing titanium with carbon fiber reduces weight, and that saved weight was put back in the head by adding a 54-gram weight to the very back of the head. Having that much mass concentrated in the rear of the club keeps it moving forward and wobbling less on mis-hits, which should result in straighter drives.
The ST-Max 230 has a forged face made from Beta Rich Ti LFS titanium. (David Dusek/Golfweek)
To increase ball speed, Mizuno opted to use the same Beta Rich Ti LFS titanium in the face that debuted in the ST-G driver. It is lighter and has a higher tensile strength, so the multi-thickness face can flex more efficiently while maintaining durability.
Mizuno also increased the size of the CorTech Chamber, which is behind the leading edge in the sole. Mizuno has used this technology in recent drivers, and it involves creating a slot in the sole and then filling it with thermoplastic polyurethane (TPU) to keep water and debris from getting inside the head. Inside the TPU, Mizuno adds a stainless steel bar, so while the soft TPU material allows the lower portion of the face to flex more efficiently on low-struck shots, the bar helps the head maintain momentum. The TPU material also soaks up excessive vibrations and enhances sound, so drives feel and sound better.
Below are several close-up photos of the Mizuno ST-Max driver.
Who They’re For: Golfers who seek more distance and forgiveness (Black Ops), along with players who want a low-spin driver that allows players to shape shots (Black Ops Tour-1)
The Skinny: PXG is using a new titanium alloy that allows designers to make the variable-thickness faces hotter, while the combination of moveable weights boosts forgiveness and lets players tweak the launch angle and spin rate.
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The Deep Dive: PXG has consistently named its clubs after military designations and equipment, and its newest driver family, the Black Ops, is no exception.
There are two Black Ops drivers: the standard and the Tour-1. Both are 460 cubic centimeters in volume, but the standard version looks larger from front to back in the address position. The Tour-1 has a taller face, a higher crown and a keel in the back of the sole. While they are made for different types of golfers, the two drivers share several core technologies and features.
Both Black Ops drivers feature variable-thickness faces made with a proprietary titanium alloy that PXG calls AMF. That stands for advanced material face, but the Scottsdale, Arizona-based company is not divulging precisely what is in the material. It does say, however, that AMF is extremely strong but flexes, so it bends without breaking. That allowed engineers to make the Black Ops faces thinner and lighter while maintaining durability.
PXG is using a proprietary alloy it calls AMF to create the faces of the Black Ops drivers. (David Dusek/Golfweek)
In testing, PXG built a previous-model GEN6 driver with an AMF face, and the club produced an increase of 0.5 degrees in launch angle with 200 rpm less spin without changing any other parts of the club.
Both Black Ops drivers also feature faces that have been polished by robots instead of people, and that allows PXG to manufacture faces that have non-uniform bulge (curvature from heel to toe) and roll (curvature from top to bottom) very precisely. PXG said that adjusting the curvature reduces spin on low-struck shots that would typically spin more, and the Black Ops drivers can add spin on high-hit shots that ordinarily lack spin, resulting in more spin consistency from shot to shot.
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A larger carbon fiber crown reduces weight on the top of the head. (David Dusek/Golfweek)
As with previous PXG drivers, the Black Ops and Black Ops Tour-1 also have large carbon fiber crowns and sole plates that remove weight from areas that don’t benefit performance and allow designers to shift it to places that enhance stability, forgiveness and ball speed.
Much of the saved weight has gone into three adjustable screws that are in the sole of each driver.
The standard Black Ops comes with a 12.5-gram weight in the back-center port and 2.5-gram weights in the heel and toe ports. In that configuration, the club’s stability and moment of inertia are maximized and it should produce more spin and create a higher launch as well. Positioning the heavier weight in the heel will create a draw bias, while adding it to the toe will encourage a fade.
The Black Ops Tour-1 also has three ports and the same three weights, but the heel and toe ports are located in the forward-center area of the sole instead of the perimeter. The Tour-1 will produce a lower flight and less spin in every configuration, and golfers can still create a draw or a fade bias.
The standard Black Ops will be available in 8, 9, 10.5 and 12 degrees of loft, and it looks larger in the address position. It produces a higher ball flight with more spin than the Black Ops Tour-1, and with its three weights in the extreme perimeter of the head, golfers can shift the center of gravity more in the standard head, too.
The Black Ops Tour-1 – available in 8, 9 and 10.5 degrees – has a classic teardrop shape and deep face intended to make it more appealing to fast-swinging, accomplished golfers who want a low-spin driver. The Tour-1 has a center of gravity closer to the face than the standard Black Ops, which helps it produce less spin and a lower launch angle.
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Here are several images of the PXG Black Ops drivers:
