Mizuno ST-G 440 Driver Review (NEW 2023 Release, Third Generation)

The new ST-G 440 driver has been revealed by Mizuno

The ST-G is a new 440cc model from Mizuno.

Mizuno ST-G 440 Driver

The Mizuno ST-G 440 driver is the new release and the third generation of the ST-G model. After being added to the confirming list, we take a look at the 440cc new driver.

Mizuno unveiled the latest version of the ST-G, which gets the number this time from the size of the “squat” 440cc head, at the 2023 Open Championship and it will be the successor to the ST-G 220 that debuted in 2022.

From what we can see, it has two repositioned sliding weight tracks for maximum setup and adjustable options, as well as the Cortech Chamber which also features in the ST-X 230 and ST-Z 230 drivers.

We take a look at the changes Mizuno have made, what they will do to performance and provided all the information about the new 2023 Mizuno ST-G drivers.

NEW FOR 2023: Review of the Mizuno ST-Z 230 Driver
NEW FOR 2023: Review of the Mizuno ST-X 230 Driver

What Mizuno says about the ST-G 440 driver:

“A very squat, ultra low spin 440cc driver at The Open Championship.”

RELATED: Review of the Mizuno ST-G 220 Driver

Mizuno ST-G 440 Design & Features

The ST-G 440 is the latest version of Mizuno’s popular model and one which has been introduced in a slightly smaller 440cc clubhead for 2023.

The so-called squat driver is more compact than the previous version, but improvements have been made to the weighting of the latest model.

Mizuno ST-G 440 Driver

The ST-G has two weighting tracking ones again, but both the front and back are longer than before and more in line with the ST-G 220 range.

The two weights can be positioned for draw, fade or neutral bias as well as adjusted separately to provide a low, medium or high ball flight.

The Cortech Chamber has been brought into the ST-G having appeared in the ST-Z drivers, and is designed to enhance ball speeds across the face.

Mizuno ST-G 440 Driver

The face itself is a forged Ti-LFS construction with this titanium construction a change from previous versions.

The new ST-G 230 driver is available in 9.5 degrees and 10.5 degrees lofts with four degrees of adjustability (7.5-11.5 and 8.5-12.5).

RELATED: Review of the Mizuno ST 200 Drivers

Verdict: Is the Mizuno ST-G 440 driver any good?

Mizuno unveiled the new driver at the 2023 Open Championship and it will be interesting to see how it performs in the testing.

Mizuno ST-G 440 Driver

The ST-G 220 was a solid performer and the 440 is an interesting move with the more compact 440cc driver head offering something a little different.

Other changes like the Cortech Chamber and not face construction should add to the performance of this model which looks set for a big future.

NEW: Review of the Mizuno T24 Wedges


When is the Mizuno ST-G 440 driver being released?

It was unveiled in July 2023 at the Open Championship and is due to go on sale in September 2023.

How much does the Mizuno ST-G 440 driver cost?

The cost of the driver is not yet revealed, but is expected to retain for upwards of £400 / $550.

Do Mizuno ST-G drivers come with warranty?

Yes. You can expect one year manufacturer’s warranty as standard from Mizuno.