Mizuno ST-Z 230 Driver

Loft Options & Stock Shafts

Technology

Tour Driver

The ST-Z 230 is Mizuno's low-spin tour driver for 2023, and the 440cc head tells you immediately who it's aimed at. Twenty cubic centimeters smaller than the ST-X 230, it sits at address with a compact, slightly open profile that better players tend to like. That size reduction is functional, not cosmetic.

Mizuno built the face from SAT2041 Beta Titanium, the same material philosophy behind their forged irons, which allows a thinner face without sacrificing durability. Carbon composite covers the crown and portions of the sole, freeing up enough mass to position a tungsten weight for spin management. Adjustability runs through a standard hosel offering roughly two degrees in either direction.

Spin is the central variable here. Players already generating low spin might not need it. But for anyone fighting a ballooning ball flight at higher swing speeds, losing distance when temperatures drop or when wind picks up, the ST-Z 230 addresses that problem directly without requiring a shaft swap.

• Mid-to-low handicappers with swing speeds above 95 mph who lose distance when the ball climbs too high, particularly in wind or on cold days.
• Players who prefer a compact, traditional head shape at address and find standard 460cc drivers visually too busy or too large over the ball.
• Anyone who has been fighting high spin and tried shaft upgrades already without enough improvement.

Frequently Asked Questions

How does the Mizuno ST-Z 230 compare to the ST-X 230?

The ST-X 230 is 460cc with higher MOI and more forgiveness, built for players who want stability on off-center hits. The ST-Z 230 is 440cc with a lower spin profile, tighter miss windows, and a more compact shape that appeals to better players. If you are not sure which fits you, the ST-X is the safer pick. The ST-Z is for players who know spin is their problem.

Is the Mizuno ST-Z 230 good for slower swing speeds?

Not really. Low spin sounds attractive in theory, but players below 95 mph typically need spin to generate carry. Reducing it further costs them height and distance. The ST-Z 230 is built for higher swing speeds where excess spin becomes a liability. A slower swinger would likely lose yards with this head compared to a higher-launch alternative.

How much loft adjustment does the ST-Z 230 have?

The adjustable hosel covers approximately plus or minus two degrees of loft, along with some face angle and lie variation within that range. Two degrees is enough to move the ball flight meaningfully without needing a different head. It is not a wide range by modern standards, but most players who are a good fit for this driver are not making large loft changes.

What shafts come with the Mizuno ST-Z 230?

Mizuno sells this driver primarily through fitting-focused retail, with shaft options varying by retailer. Common stock offerings include Diamana and Project X models in stiff and extra stiff flexes. Most players buying this specific driver end up in a fitting session anyway, since shaft selection matters more with a low-spin head than with a forgiving 460cc design.

Is a 2023 Mizuno ST-Z 230 still worth buying now?

Yes, for the right player. Driver performance does not change enough between generations to make a 2023 model obsolete. The beta titanium face and the compact low-spin profile are not things that get meaningfully improved year over year. Buying it new-old-stock or used at a discount gives the same performance with no real penalty.