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GolfWRX Spotted: 2021 Mizuno ST-Z and ST-X drivers on USGA Conforming List

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When it comes to drivers, Mizuno isn’t usually the company that comes to the top of mind for many golfers, but starting with the ST-190, and then the ST-200 series in 2020, they have quickly changed the perception of their metal woods thanks to wins on tour and more players choosing to put them in play—most recently Brandt Snedeker as a non-contracted player.

This morning, with the update of the USGA and R&A conforming equipment lists, we are getting a sneak peek at what Mizuno will have in store for 2021 with the release of the ST-Z and ST-X drivers.

What we know

Based on the information provided in the USGA submission by Mizuno, the ST-X will only be available in right-handed (10.5 and 12-degree lofts), while the ST-Z will be available in both right (9.5  and 10.5 degrees) and left-handed (9.5 degrees only).

ST-Z

Based on the images from the USGA list and our experience with the Mizuno product line, it appears that the ST-Z is the next step in the evolution of the standard ST200 with no adjustable CG but with a customizable weight in the back of the head.

We haven’t seen any images of a moveable weight driver in this new ST series, so it could be that the G-woods are getting phased out in favor of more internally biased weighting, but since those types of drivers often take a bit more time to get just right, it could be a matter of time before a “G” type driver hits the list.

As for technology, it has Mizuno’s standard wave to create flexibility behind the face, an adjustable hosel, and based on the images, more carbon fiber used around the head compared to previous generations, especially on the sole. I would also expect to hear a new face material or design story to complete the package and to boost MOI and ball speed.

ST-X

Based on the image from the USGA list and our experience, it appears that the ST-X is the next step in the evolution of the ST200-X driver, which is the lighter weight, more upright, and draw-biased driver from Mizuno. Don’t think draw bias always means it’s for higher handicaps either, because Mizuno staff player Chris Kirk got along very nicely with his out on the Korn Ferry and PGA Tours in 2020, including a win.

The tell-tale sign is the more heel biased weight in the back of the driver and what looks to be some sort of textured area to create “visible technology” towards the heel of the clubhead.

Beyond being draw-biased, when it comes to technology, it shares a lot of similarities to the ST-Z with Mizuno’s standing wave to create flexibility behind the face, an adjustable hosel, and more carbon fiber used around the head compared to previous generations, especially on the sole, and in the case of the ST-X, on the sole.

We don’t have any information on the release of these new drivers, but considering Mizuno didn’t adjust product release schedules in 2020, I would imagine it will be doing the same in 2021, and we can expect to hear more about these ST drivers either late 2020 or early into 2021.

To see what other golfers are saying about the newly spotted Mizuno ST-Z and ST-X drivers, check out the GolfWRX forums and join the discussion: GolfWRX – New Mizuno drivers spotted on USGA Conforming List

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Ryan Barath is part of the Digital Content Creation Team for GolfWRX. He hosts the "On Spec" Podcast on the GolfWRX Radio Network which focuses on discussing everything golf, including gear, technology, fitting, and course architecture. He is a club-fitter & master club builder with more than 17 years of experience working with golfers of all skill levels, including PGA Tour players. He is the former Build Shop Manager & Social Media Coordinator for Modern Golf. He now works independently from his home shop and is a member of advisory panels to a select number of golf equipment manufacturers. You can find Ryan on Twitter and Instagram where he's always willing to chat golf, and share his passion for club building, course architecture and wedge grinding.

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Whats in the Bag

Kevin Na’s winning WITB: 2021 Sony Open

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Kevin Na’s What’s In The Bag?

Driver: Callaway GBB Epic (9 degrees)
Shaft: Graphite Design Tour AD GP 6 TX

3-wood: Callaway Epic Flash Sub Zero (13.5 degrees)
Shaft: Mitsubishi Diamana RF 70 TX

5-wood: Callaway Epic Flash Sub Zero (18 degrees)
Shaft: Mitsubishi Diamana RF 80 TX

Hybrid: PXG 0317 X Gen 2 (19 degrees)
Shaft: Graphite Design Tour AD DI 95X

Irons: Callaway Rogue Pro (4), Callaway Apex Pro 16 (5-PW)
Shafts: True Temper Dynamic Gold Tour Issue S400

Wedges: Callaway Mack Daddy 4 (54), Vokey Design prototype (’18) (60-06K )
Shafts: True Temper Dynamic Gold Tour Issue S400

Putter: Odyssey Toulon Madison

Grips: Golf Pride Tour Velvet Plus4

Ball: Titleist Pro V1x

Join in on the Kevin Na WITB discussion in the forums 

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Equipment

2021 Callaway Epic Speed Launch Day Report: Everything you need to know about the new equipment from Callaway

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It’s the official launch day of the all-new Callaway Epic Speed line of metal woods, which includes both driver and fairway wood models—Epic Speed, Epic Max, and Epic LS. To summarize the newest releases, Callaway engineers are taking their artificial intelligence as far as they ever have by using it to optimize both the face and body of the driver to deliver forgiveness and distance increasing ball speed across the face like never before.

If are looking for in-depth information, on the ins and outs of the new designs and the technology that makes them possible, check out our full launch pieces below.

The new 2021 Callaway Epic Speed driver

The Epic Speed is the fastest swinging driver Callaway has ever made. The elevated Cyclone Aero Design gives players a clubhead that gets through the air and down into impact faster creating even more ball speed opportunities.

2021 Callaway Epic Max driver

The new 2021 Callaway Epic Max driver is a heater, but more than anything, it’s forgiving. Using all the tech bells and whistles from Epic Speed (AI-designed Jailbreak and Flash Face), Callaway made the Epic Max crown lighter with even more triaxial carbon, saving 19 grams of discretionary weight, which allows them to create an even deeper CG and higher MOI. A rear sliding 17-gram weight in the trunk to tune in launch and shape and the OptiFit hosel provides up to 20 yards of shot shape correction.

2021 Callaway Epic Max LS

Out with the Sub Zero and in with the most playable players driver Callaway has created. With a neutral shape and weight configuration that is the more fade bias of the Callaway family, the new LS has a very high MOI (8,400+) for a tour-inspired driver. The idea was to give high speed players something fast all while mitigating the big miss better players fear. Yes, we all fear a big miss, but at high speeds, the foul ball is, well, a bit more foul. The new triaxial carbon crown saves 13 grams of weight, which was redistributed to increase MOI and lower CG.

Perspectives from the GolfWRX forums

  • bcflyguy1 – I’ve also found the Max head to be excellent when lofted down and weight pushed to the toe; becomes surprisingly neutral when configured as such. Obviously can see where many will prefer the more muted sound/feel and compact footprint of the Speed head or may need the greater fade bias from the Max LS and its Trip Diamond-ish shaping. However, the Max offers a VERY rare combination of tons or horsepower but with sufficient traction control to keep even me from figuratively wrapping it around a light pole.
  • noodle3873 – Just got back from hitting balls. My local Pro was breaking in his Epic LS 9° against his Mavrik SZ TD 9°. Both heads were built/hotmelted to the same weight. He was using GC Quad and brand new Srixon range balls (not ideal but numbers are like for like). On average he was getting more launch, more ball speed and a couple more yards out of the LS.
  • mtp –  I hit the whole lineup today. Not a fitting.  Just trying them out. Was using the HZRDUS Smoke Green. LS was best for me. Prefer the shape, sound and feel over my current Sim Max.
  • zeke66 – This thing is a beast. Hit it with a Paderson ballistic tp. I was swinging awful with all 3 drivers I was hitting including gamer, and wouldn’t leave the hitting bay until I started hitting it better. So I grabbed the Max Ls 9.0 and worked through it. Average ball speed was around 177 low 120’s with spin around 2100-2200, launch 12-15. When you catch one on the screws… it goes as good as anything I think.

More from the GolfWRX forums

GolfWRX’s resident equipment tester, Brian Knudson of the Club Junkie podcast, had this to say

Epic Max driver: A lot of draw bias, but easy to launch high and takes some right side out even with a neutral weight. Sound and feel are improved over Mavrik, much more muted and solid feeling. Center strikes are hot, and even misses carry some good ball speed.

Epic Speed driver: The best looking of the Epic drivers. Offers the most penetrating flight. Seems to be pretty low spin and easy to work the ball in either direction. Misses don’t stay online as well with more curvature. It is long and going to be a really good option for skilled players.

Epic Max LS driver: Very forgiving and offering a straighter flight than Max. Slightly lower trajectory as well. Toe misses hold their line better than the other two. Shots low on the face don’t get up as high as expected but still carry. Misses off-center still have good carry distance

Here’s what the biggest YouTube testers and reviews have to say on the newest Callaway Apex line

And on Instagram

 

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From the Twitterverse

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Equipment

Best utility iron of 2021 – GolfWRXers discuss

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In our forums, our members have been discussing 2021 utility irons. WRXer ‘Krod10359’ kicks off the thread, saying:

“Just want to know your opinion on what new utility iron you have hit this year. Looks like a lot of solid offerings out right now from Ping, Srixon and Callaway. Let me hear what you have to say about these clubs.”

And our members have been sharing their thoughts in our forum.

Here are a few posts from the thread, but make sure to check out the entire discussion and have your say at the link below.

  • hypergolf: “This…(photo above)”
  • TigerInTheWoods: “Sim Udi is a beauty. Launches a bit higher and is a bit more forgiving than the P790 UDI which was really the benchmark for this kind of club.”
  • craz-e: “Hard to go past the Srixon for performance and value. The current offerings from Titleist (u500 & u501) and Mizuno (HMB) are also great options and worth trying.”
  • Golfingfanatic: “The new Callaway one is pretty good.”

Entire Thread: “Best utility iron of 2021”

Not yet a GolfWRX member? Sign up for FREE here.

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