Gear: Mizuno ST-G driver
Price: $599.95 with Project X RDX Smoke Green or Mitsubishi Kai’ Lu Blue shaft and Lamkin Crossline Genesis grip.
Specs: 440-cubic-centimeter titanium body with carbon fiber crown, two moveable 7-gram weights and adjustable hosel. 9.5 and 10.5-degree versions. (9.5 only in left-handed model.)
Available: October 5
Who It’s For: Accomplished golfers and fast-swinging players who want to shape shots off the tee with a low-spin, adjustable club with a classic look in the address position.
The Skinny: Combining plenty of carbon fiber with a smaller head and two moveable weight tracks, Mizuno’s newest driver for better players aims to decrease spin and produce a piercing, controlled flight.
The Deep Dive: At the start of this season, Mizuno continued its work to gain more traction in the driver market by releasing the 230 ST-Z and 230 ST-X, clubs designed to bring more ball speed and forgiveness to a wide variety of players. Those clubs will be back in 2024, but Mizuno is now releasing a driver for better players to join them, the ST-G.
The Mizuno Pro line of irons is the Japanese company’s highest expression of quality for high-level players, and some people within the brand think of the ST-G woods in the same way.
At 440 cubic centimeters in volume, the club is smaller than most clubs on the market, with a carbon fiber crown that extends over the edge on the toe side and wraps into the side and sole. That large carbon fiber crown weighs just 16 grams, but the glossy black finish helps it retain a classic look in the address position.
The Mizuno G230 driver has a compact, clean look in the address position. (David Dusek/Golfweek)
Golfers may recall that the 2021 version of the ST-G driver had three moveable weight tracks, with two running from front to back, controlling the draw and fade bias, while a third track in the rear of the sole allowed players to control shot height. In the new model, there are two tracks, but they do the job of three. Golfers and fitters can slide the 7-gram weights forward to reduce spin and produce a lower ball flight or back to add spin, raise stability and encourage higher-flying drives. The weights can also be positioned on the same track to create strong draw or fade biases that boost MOI and stability.
The face of the ST-G driver is made from a unique titanium alloy that Mizuno calls Beta Rich Ti-LFS. The LFS stands for lighter, faster, stronger, and the material has been heat treated to make it stronger without making it thicker or heavier.
The ST-G has also been designed with a Cortech Chamber, a feature that debuted in last season’s 230 ST-Z and 230 ST-X drivers. It’s a slot in the sole, behind the leading edge, filled with a thermoplastic polyurethane (TPU) to keep water and debris out of the head. Inside the TPU piece, Mizuno adds a stainless steel piece that runs from the heel to toe. The Cortech Chamber allows the face to flex more efficiently on low-struck shots.
Finally, the ST-G driver has an adjustable hosel that allows players and fitters to increase or decrease the loft by up to 2 degrees.
Below are several close-up images of the new Mizuno ST-G.