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Mizuno 2023: The ST-230 Series & JPX923 Irons Reviewed



Mizuno Golf has worked tirelessly to become one of golf’s premier brands. Known for their incredible Grain Flow forged iron designs, Mizuno is also a leader in the metalwoods game. Their latest ranges feature game-changing technologies and sleek design concepts - exactly what you would expect from a long-established brand. Below, we’re taking a look at what Mizuno’s offering for 2023 and breaking down the elements that will work for your golf game.

Read on to find out more about the Mizuno ST-230 range and the Mizuno JPX923 golf irons.

Mizuno ST-230 Series – The Missing Piece

After four years of rapid-fire development and input from Mizuno’s Tour staff, the brand’s latest metalwoods look to be gaining equal footing to the iconic Mizuno irons. After multiple iterative developments for stability, sound and spin, Mizuno is zoning in on ball speed and the new CORTECH Chamber is what’s making all the difference.

So, what exactly is the CORTECH Chamber? Essentially, it’s a way to reduce stress from the face. The CORTECH Chamber encases a stainless-steel weight with elastomeric TPU. Mizuno states that this helps to take stress from the clubface and creates an additional energy source. At the same time, moving the weight closer to the clubface helps to reduce spin rates, whilst also contributing to a more solid, powerful sensation at impact.

Featuring a sleek black design with sharp blue accents, the new ST 320 Series looks good and sounds good. Let’s explore the models more and talk about which club would suit you.

2 Driver Models to Ensure Every Player is Covered

ST-X 230 – More Workable, Mild Draw Biased

“The new ST-X 230 is a complex character. Although in the higher loft option it’s a higher flying draw biased option, the 9.5 for many of our tour players was more workable and faster from the face. You really need to hit both models before making any judgements on which is likely to work best for you.”

CHRIS VOSHALL – GOLF CLUB ENGINEER AT MIZUNO GOLF

Fact Finder : Featuring a more rounded, deeper profile with weight located closer to the hosel, the X model will produce slightly higher spinning and draw biased for the majority of players, and more workability for many elite golfers (this is especially true in the lower lofts).

Who’s it for?  Those players who slice the ball, or natural drawers can expect better ball speeds from the X. For the player who wants control.

ST-Z 230 – Straight, Stable and Low Spinning

“Tour tests for the ST 230 SERIES have all been very consistent – relief that the look is similar at address. Then shock at how much better the new ST-Z 230 feels off the face. Ball speeds are up on average 2-5mph with a drop in back spin of around 200 rpm.”

CHRIS VOSHALL – GOLF CLUB ENGINEER AT MIZUNO GOLF

Fact Finder : Similar in look and character to the previous ST-Z model, the new Z 230 offers a straight bias driver with great stability on off-centre hits. Featuring a great combination of deeper CG and shorter CG distance for a balance and workability in both directions whilst still providing higher MOI and mid/low spin.

Who’s it for? A more neutral option, it’s a modern players profile club that helps you go straighter.

The ST-Z 230 Fairway Woods &  Hybrids

Fairway Woods That are Straight, Stable and High Launching

“The CORTECH Chamber is very effective on the fairway woods and hybrids as it does such a good job of lowering the sweet spot – maintaining ball speeds when you have to pinch one from a tight fairway.”
CHRIS VOSHALL – GOLF CLUB ENGINEER AT MIZUNO GOLF

Fact Finder : These adjustable (by 4 degrees) fairway woods are low spinning and high launching. Featuring a high energy MAS1C steel face, and Mizuno’s incredible CORTECH Chamber, you can expect amazing ball speeds and a powerful, solid sensation at impact. An additional 8 grams of backweight balances with a heavier front section to aid consistent launch characteristics, whilst a carbon composite crown has also been employed to ensure low CG and stability on off-centre hits.

Who’s it for? Developed with the expertise of Mizuno’s tour advisors, the ST-Z 230 fairways are midsized, meaning they will be a benefit to every level of player.

Hybrids with a Slightly Larger, More Playable Footprint

Fact Finder: Featuring a waffle crown and thick sole weight, the new ST-Z 230 Hybrids have been engineered to a create a low sweet spot and deep CG to produce a high stable launch and efficient spin rates. Like the fairways, a quick switch hosel gives you 4 degrees of adjustability.

Who’s it for? Quick switch adjustability and a number of custom shafts and grip options, help to make the hybrids a versatile option for any level of player.



Mizuno JPX923 Golf Irons – Engineered for Custom Performance

The new JPX923 golf irons have been specifically engineered for custom performance. Known for their incredible iron designs, Mizuno is once again pushing the boundaries of innovation – with five unique iron models, crafted from three specific metals, all based on the Swing DNA of over 350,000 real golfers. Below you will find an iron model perfect for your swing speed and overall game.

Three Metals. Five Options. All Distinctly Mizuno.

“The new JPX923 series was planned out with Mizuno’s custom ethos at its core. We already offer more than 50 unique shafts within our custom program, by expanding to five iron models, there’s an ideal combination for every type of player.”
DAVID LLEWELLYN – DIRECTOR OF R&D MIZUNO

JPX923 Tour

Fact Finder : A one-piece Grain Flow Forged HD from 1025E Pure Select mild carbon steel created at Mizuno’s iconic facility in Hiroshima, Japan. Featuring a soft copper underlay and a generously rolled trailing edge for cleaner turf interaction. A non-reflective, Chrome plated finish has also been employed to reduce bright light glare. These refined scoring irons feature a noticeably shorter blade length and are more compact from the 6 iron to the GW, garnering precision where it’s needed most.

Who’s it for?  Pro to elite amateurs.

JPX923 Forged

Fact Finder : This is a mid-sized, full body Grain Flow Forged iron that delivers the perfect balance of ball speed, stability and feel. Mizuno’s third generation of Chromoly Forging (in the 4-7 iron) also incorporates a milling slot that extends wider to heel and toe.

Who’s it for? Pro to mid handicappers.

JPX923 Hot Metal Pro

Fact Finder : Constructed from one piece nickel chromoly cavity and featuring Mizuno’s new V-Chassis, these irons deliver a solid satisfying vibration pattern, even though the clubface is 8% thinner. With a compact design and minimal offset, the Hot Metal Pros are perfect for confident ball strikers looking to maximise ball speed.

Who’s it for?  Low to mid handicappers.

JPX923 Hot Metal

Fact Finder : A forgiving speed cavity iron crafted from one piece nickel chromoly. This full speed, high stability cavity will help golfer’s that need a little help to produce straight flight and distance. The design combines Mizuno’s vibration controlling V-Chassis and a deep CG to ensure the Hot Metal irons are as enjoyable and controllable, as they are long.

Who’s it for?  Mid to high handicappers.

JPX923 Hot Metal HL

Fact Finder : This is a super game-improvement iron. Featuring the same blade length as the Hot Metal iron, the HL (High Launch) model employs a wider sole for a lower, deeper CG to optimise high launch conditions. It’s the perfect higher launching option for players with a moderate swing speed or aggressive shaft lean.

Who’s it for?  Mid to high handicappers.

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