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Bryson DeChambeau — winner of the 2015 U.S. Amateur and NCAA Men’s Individual Golf Championships and recently turned professional — plays with a unique set of irons and wedges that all measure the same length.

In my video, I review Sterling Irons from Tom Wishon and Jaacob Bowden that are designed to also measure one length throughout the set.

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Mark Crossfield has been coaching golf for more than 20 years, and has enjoyed shaping the digital golf world with fresh, original and educated videos. Basically, I am that guy from YouTube. You can connect with Mark on Periscope (4golfonline) and Snapchat (AskGolfGuru), as well through the social media accounts linked below.

33 Comments

33 Comments

  1. Diogenes

    May 4, 2017 at 12:12 pm

    Just tried two Pinhawks (20 and 25 degrees numbered #4 and #5) for two rounds now and like them very much so far. Cannot confirm the reported low ballflight. They behave like a regular #3 and #4 iron which corresponds to the loft. Still struggeling with the 20 degrees iron played from the fairway but the 25 degrees works already great! Hit it much more consistently compared to my regular #4 and even #5 iron. Cannot complain about the distance as well. The shafts are 36,5 inches (FST 115 stiff) and the lie is 63,5 degrees (one upright). I was not looking for a single length set but replacing the longer irons definately makes sense to me! 🙂

  2. Warwick b

    Jun 20, 2016 at 3:36 am

    It’s a shame they aren’t available for lefties

  3. Warwick b

    Jun 20, 2016 at 3:35 am

    Shame they aren’t available for lefties

  4. Scott

    Jun 15, 2016 at 2:37 pm

    Great review of a very interesting concept. It is great to see what a better player things of something unique.

  5. Ally

    Jun 15, 2016 at 6:15 am

    Mark great review on tom wishons sterlings. I myself had a set of conventional irons build to SI. And they performed great the short irons were very accurate we did have a bit of adjusting to do with the 4&5 irons the trajectory was too low and it was loosing distance. We ended up increasing loft and now all is fine. Did notice though that on the 4&5 irons i did need to have at least 80mph swing speed.. Overall i really believe the concept works. Cheers

  6. Tour Pro

    Jun 9, 2016 at 6:22 am

    30 years a bit of a stretch to be calling it a fad

  7. leon

    Jun 7, 2016 at 3:53 pm

    The single length concept is fine. But just don’t understand why people (especially golfer) always try (and hope or beg) to find an instant cure to their swing.

    If you cannot handle the 4,5 or 6 iron, try the hybrids, they are much easier to hit and launch high and straight. Or just make the 4,5 and 6 have the same length. If you cannot take care of 7,8,9 and P, sorry, dude. You really need to work on your swing, seriously.

    Use the same length for 5-SW may sound intriguing for some people, but you still need to deal with the different lengths of your driver, fairway wood and hybrid. So why bothers?

    I guess 95% of people who would like to try the single length irons, have some challenges to hit the 4 and 5 or even the 6 iron. Just use the hybrids or hybrid-iron combo set (should be around $200-$300) rather than spending $1000 and look like a sucker.

    • Mike

      Jun 15, 2016 at 4:35 am

      The single length concept is AWESOME! I (was) a 1 HCP and can hit the 3 and 4 irons as well. But i definitely hit the 7 iron much more solid then my 4 iron.
      i now playing a single length set and hit the 4 as solid as my 7, or 9, or P. I loosed 5 yards. So who cares about 5 yards if you hit them MUCH better? I also use a hybrid and a driver. So i have 3 lengths in my bag. And thats pretty easy to handle.
      Sure, this is not for every one. But it makes the game a lot easier. Droped to +HCP this season…and this looks definitely not like a sucker! The + on the scorecard looks SEXY 😉

      • Tony

        Feb 28, 2017 at 11:01 am

        Would love to know more. I have been racking my brain on the single length concept. I’m a 3 handicap. There are 3 distinct versions and concepts of the single length out there with Cobra, Wishon and 1Iron Golf. How deep did you look into this and what advantages and disadvantages did you run into while trying to decide. I’m 5’7″ 8 iron 152 yds. thanks for your response

  8. Tom

    Jun 7, 2016 at 3:17 pm

    Say this Crossfield chap has a good looking swing.

  9. tlmck

    Jun 7, 2016 at 3:15 pm

    Given the cost of Sterlings and lack of local demos, I may just build a set of PinHawks when they become available again. I have an unused set of TT Command shafts in the closet that need something to do. Not unhappy with my Speedblades, but just another curious engineer.

  10. farmer

    Jun 7, 2016 at 12:51 pm

    I would like to see the results of a real round. The concept is very interesting, but for me, chipping and pitching with a 7 iron length wedge would be difficult. The idea makes sense, and it may be THE NEXT BIG THING.

    • Brown

      Jun 8, 2016 at 3:37 am

      Well why not just watch Dechambeau do it on the Tour then, silly

  11. Matty

    Jun 7, 2016 at 10:07 am

    Few things:
    1) Shouldn’t the offset be constant throughout the set? According to the specs, the offset is not the same throughout the set unlike the Pinhawk irons.

    2) Mizuno’s current wedges are single length at 35.25 inches, so at least that is a good place to start in terms of single-lengthening the wedges.

    • Jaacob Bowden

      Jun 7, 2016 at 10:12 am

      Historically, the low-lofted irons in single length sets would fly too low and the high-lofted irons would fly too high. The progressive offset slightly helps address this by moving the center of gravity forward and backward from head to head. This combined with some other built-in features help achieve similar peak shots heights throughout the set.

  12. Frank Xavier

    Jun 7, 2016 at 9:18 am

    Great commentary. It is an excellent demonstration of the viability of SLI’s. Mark does mention the possible benefits of single length to the new/beginner several times with the caveat that he never had the adjustment problem. I like to see golf as a staged learning process with the objective being to make arriving at the earliest and highest possible competency level the main objective. This approach tends to move new golfers to become much more enthusiastic about the game rather than less. Single length clubs when combined with systematic instruction will likely increase beginner and new golfer competency. Only systematic, quantitative data can definitely prove this point and as we know this information does not exist.

    I would go sofar as to suggest that standard SLI’s could easily be regarded as the beginning golfers friend; and upon reaching the 10 handicap level, graduation could occur to either longer clubs or SLI’s which have had the heads tweaked to achieve higher performance. Serious golf enthusiast’s especially those in the single digit handicap category commonly forget that 98% of golfers will never achieve a single digit handicap.

  13. Steve

    Jun 7, 2016 at 9:16 am

    They appear to be very accurate as well.

  14. Large Chris

    Jun 7, 2016 at 4:27 am

    Definitely interesting but worth a closer look at the numbers. The short irons seem to work very well, they address the main issue single length (I’ve tried the Pinhawks) has had, by lowering the peak height to a fairly uniform level (making them less hot off the face), and getting the gapping correct.
    However, only 19 yards difference is covering the 5 – 7 irons, and the peak height of the 5 iron has dropped down to 26 yards from 30, without any more spin, which suggests the loss of a few mph due to the shorter shaft is reducing ball speed and compromising distance too much, I would think Crosssfield is realistically 10 yards down on a standard modern 5 iron.

    • Mat

      Jun 7, 2016 at 5:11 am

      And that is what I’ve found as well. I’ve actually been tinkering with a 4-iron at 24, and then going to 6 at 29. Those pinhawks are 5º between all of them, but they don’t have the material differences. I’ve actually found that the long irons don’t get high enough, and that’s what causes gap crowding. This of course is based on my experience with “regular” heads. I think this really drives home the point that 8-iron and down is all about dialing in your distances, but some really do need that length at the top of the irons. My other set is 8i-58º within 1/8″ of an inch… all at D9. Then it’s standard 1/2″ steps. It isn’t as easy to hit, but the long iron problems don’t exist.

      Most second shots are within 150 yards, so all the better to get the 7/8iron and down the same.

    • Steve

      Jun 7, 2016 at 7:24 am

      The 5 & 7 numbers are a bit skewed by a mishit 5 and a shot wit the 7 that was 5 yards longer than the other 2. Also, the 7 iron was the only one with a peak height of 30. I suspect a larger sample would normalize the distances.

  15. snowman0157

    Jun 6, 2016 at 11:00 pm

    Totally makes sense. If you don’t need different lengths and lies to create the proper distance gaps, then why introduce those variables? I was always intrigued by the old Tommy Armour EQL irons. I predict these will sell Big and a create a wave of SLI players.

  16. Adam

    Jun 6, 2016 at 9:11 pm

    Title in the video says “sinle length”

  17. Jim

    Jun 6, 2016 at 7:46 pm

    This is hardly a fad. Moe Norman played SLI clubs and is one of the greatest golfers of all time. The truth is on the wall…SLI clubs can be very beneficial to anyone out there, just have to find a set.

    • kyle

      Jun 6, 2016 at 9:45 pm

      Moe didn’t use single length clubs during his actual playing career, just later on when he endorsed the natural golf stuff.

      That being said, SLI are probably a good option for some golfers.

    • es

      Jun 6, 2016 at 11:53 pm

      Moe Norman one of the greatest of all time? Maybe a great Canadian player or maybe a great ball striker… he could probably middle a 48inch 7 iron, not the ideal SLI user trying to find consistency…
      But SLI does have a great new ambassador – the Great in his own mind and future web.com player Bryson DeChambeau. Have not seen such celebration for a player yet to secure a PGA tour card with only 1 top 20 finish and 4 missed cuts in a row.

      • Credentials

        Jun 9, 2016 at 3:00 pm

        DeChambeau was the NCAA champ and US Amateur Champ in the same year. Not too many of those guys here on earth…. or elsewhere.

  18. mhendon

    Jun 6, 2016 at 7:25 pm

    Lol nice post… So true!

  19. Mat

    Jun 6, 2016 at 7:25 pm

    SLI is a great concept. I’ve posted on here plenty of times that I think almost every golfer would be better suited by a 1/4″ gapping or SLI. The hard part is that the lofts and ball apex get a bit funky when you take standard clubs and make them SLI. I think the hardest part about transitioning to SLI isn’t the equipment; it’s the mentality that irons are for exact distances, and not following the “distance iron” marketing. When you see guys hit their 6 iron 210 on the PGA, you get guys who want that same thing, and you end up with loft-jacking. If you can shed all of that baggage, and embrace that your irons are intended to get you an exact distance, things get better very quickly.

    • Jim

      Jun 6, 2016 at 7:49 pm

      Totally agree. I would think that 3/8″ would be far better than 1/2″ as well. I’m currently working to setup clubs using 1/4″ increments because the clubs will be far more consistent up and down the set.

  20. john

    Jun 6, 2016 at 6:56 pm

    i can hear a vlog coming, come on mark!

  21. John

    Jun 6, 2016 at 4:12 pm

    Love the reviews. These are very interesting to me. Wish there was a test set around here or I knew someone that had them to try out.

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Whats in the Bag

Sebastian Munoz winning WITB: 2019 Sanderson Farms Championship

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Driver: Ping G400 LST (8.5 @9 degrees)
Shaft: Project X HZRDUS Yellow 6.5

3-wood: Callaway Epic Flash (15 degrees)
Shaft: Project X HZRDUS Yellow

Irons: Ping i200 (3), Ping i210 (4-PW)
Shafts: Graphite Design Tour AD-DI Hybrid 85X (3), True Temper Dynamic Gold Tour Issue X100 (4-PW)

Wedges: Ping Glide 2.0 Stealth (50), Titleist Vokey Design SM7 sand (56, 60 degrees)
Shafts: True Temper Dynamic Gold Tour Issue S400

Putter: Ping Sigma 2 Valor

Ball: Titleist Pro V1

Grips: Golf Pride Z Grip Cord

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Whats in the Bag

Danny Willet’s winning WITB: 2019 BMW PGA Championship

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Driver: Callaway Rogue (9 degrees)
Shaft: Mitsubishi Diamana DF 60X

3-wood: Callaway Rogue (15 degrees)
Shaft: Mitsubishi Diamana W 70X

Irons: Callaway Apex UT (18), Callaway X Forged (21), Callaway X Forged (5-9 iron)
Shafts: True Temper Dynamic Gold SuperLite X100

Wedges: Callaway Mack Daddy Forged (46 degrees), Callaway Mack Daddy 4 (50, 56, 60 degrees)
Shafts: True Temper Dynamic Gold Superlite X100

Putter: Odyssey Stroke Lab Tuttle

Ball: Callaway Chrome Soft X

Related to Danny Willett WITB

 

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Equipment

New Mizuno MP-20 irons now available at retail

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The 2019/2020 Mizuno MP-20 irons family, the next series of MP irons to connect golfers to the classic  “Mizuno Feel,” with four new models (MP20 Blade, MP-20 MMC, & MP20 HMB – Hot Metal Blade), are now available at retail.

The MP-20 series was born from tradition and the idea of creating the ultimate set of irons for every player. Mizuno has accomplished that goal with modern design and an attention to detail on every level with all three models. Speaking to the Mizuno tradition, and something they touched on when these were originally teased on social channels with #LayersOfFeel, Mizuno is going back in time to the TN-87s and reintroducing a copper underlay to their irons—all of them!

Mizuno MP20 iron copper underlay

“Mizuno Feel”

It is part of the golf vernacular. It’s ingrained in golf (nerd) culture—it’s a real thing.

But where does it comes from, how did it get here, what is it really, and how is it a component of 2019 Mizuno MP-20 irons?

I’m here to give you some answers and introduce you to MP-20 family of irons from Mizuno.

2019-mizuno-mp-20-irons-7-iron-

2019 Mizuno MP-20 irons: 7-iron

Born from tradition, and the idea of creating the ultimate set of irons for every player, the 2019 Mizuno MP-20 family is the next series of MP irons that will connect golfers to the “Mizuno Feel.” Speaking to tradition, and something I touched on when these were originally teased on social channels with #LayersOfFeel, Mizuno is going back in time to the TN-87s and reintroducing a copper underlay to their irons—all of them! (Before someone tries to correct me: yes, I realize that they have done this for more recent Japan market model)

What does this copper layer mean? Here’s the funny thing, even Mizuno has had a hard time trying to quantify it. Through multiple rounds of extensive blind prototype testing with all of their staff players, the irons with a copper underlay won on feel EVERY SINGLE TIME! How’s that for dominance?

But why? They are truly still trying to 100 percent figure that out. Mizuno has used its HIT (Harmonic Impact Technology), metallurgy analysis, and every test it can to try and figure out why. Engineers even went as far as trying to prove the hypothesis the copper underlay “feel” was based on nostalgia but time and time again Cu won in blind testing. At the end day, the human element was still the deciding factor because humans are the ones that ultimately hit shots.

2019-mizuno-mp-20-7-iron-address

2019 Mizuno MP-20 irons

This brings us to the flagship MP-20 (Blade) (The Ultimate Tour Blade as described by Mizuno’s Product Manager & Engineer Chris Voshall). Evolving from the tradition built into the MP-18, and taking design cues from historic models like the TN 87 and MP14, the MP20s provide more flow throughout the set from top to bottom leading to even more control over ball flight. This flow also increases forgiveness (please remember it’s still a blade) and launch in the longer irons, with an increased ability to flight the ball in the scoring clubs…all of this AND a thinner top line.

Now about that top line: it’s an extremely important part of the look of the club, but what many don’t realize is it also plays a big role in feel and acoustics too. Let’s simplify for a moment: think of a clubhead like hunk of metal—a cube—now when you hit that thick piece of metal on something it doesn’t reverberate much and when it does, it’s at a different frequency making it sound heavy and “thuddy,” or as some would say, SOLID.

2019-mizuno-mp-20-7-iron-face

Now imagine if that same piece of metal, and same mass, was stretched out like a saw blade. Have you ever hit something with the side of a large saw blade? It’s wobbly, loud, and generally unpleasant, that’s what happens when an unsupported part of a club gets too thin, it acts like an amplifier of bad sound, creating terrible feel. By blending a small channel (think MP5) with the classic looks of yesteryear you get a club that feels and performs like no Mizuno before it, and as I said, with a thinner look from address.

What’s all this talk of “Flow”?

Center of gravity and mass placement (or as a Mizuno Engineer explained to me “Vertical Moment of Inertia”). Since each club is designed individually, you need the center of gravity to shift throughout the set to help control launch/trajectory (or “traj” as the kids say), and make sure spin is also at an optimal level.

For the MP-20, it means long irons that are “easier” to hit (air quotes, because like I said before, it’s still a blade), and short irons that can be more easily flighted lower with greater spin and control. Just like with the MP-18s, Mizuno is keeping with the continuous reduced blade length into the short irons for a look preferred by better players and for improved grass and turf interaction.

But What About the Rest?

You might have noticed off the top I called it the “MP-20 Family.” Here’s why: In golf, like with any other industry, data is important. But it’s only as good as you use it and well…let’s just say Mizuno has been paying close attention to how golfers and fitters have been making combo sets over the last few years. It’s all about understanding what golfers really need and thanks to some proprietary data they went even deeper when it comes to designing each and every iron in this family to make sure its performance is maximized. This is why I continue to emphasize how each set has a flow—to make sure each club in your bag is just right for you. Now to introduce you to the rest of the family members…

2019 Mizuno MP20 MMC irons (Multi-Material Construction)

2019-mizuno-mmc-irons-1

2019 Mizuno MP-20 MMC irons: 7-iron

I know, you think you’ve heard this story before but…NOT LIKE THIS!

The new MP-20 MMC is a BIG shift in design, not just because of the Cu underlay, but a radical change in how the whole club is put together. I know it sounds very “big biz,” but in the world of manufacturing it truly comes down to how “parts” are manufactured. Now, with Mizuno, I will reiterate a well-known story. All of its forged irons are single-sourced from one foundry (Chuo) in Japan through a handshake agreement that has been in place for decades.

Now back to the MMC. Before the MP-20 the MMC always had one tiny design difficulty (not a bad one, just a truth) and that was the titanium piece in the back was the same size throughout the whole set. This lead to a set with almost constant sole width. That doesn’t mean previous generations were constructed poorly, but it just means there were improvements that could be made to how the set flowed (there’s that word again) from top to bottom…which leads us to the tech story.

2019-mizuno-mp-20-mmc-irons-3

For the first time in the MMC’d life, the titanium piece of the iron will actually vary in mass depending on the club. It will be broken up in the middle of the set to allow better CG placement, and like its blade cousin, improved turf interaction in the shorter irons.

What is also very cool from a build and engineering perspective is the way the titanium gets into the club in the first place. Here we go down a metallurgy rabbit hole, buckle up…

  • Titanium has a mass density (rounded) of 4.5 g/cm3 – cubed
  • Carbon steel has a mass density of (rounded) 7.9 g/cm3 – cubed

That means that from every cubed cm of steel volume you replace with titanium in the head, you save 3.4g… which might not seem like much, but in a 4-iron for example that has an average mass of 248g for (4) cm3 you save 13.6g or just over five percent. I realize this is DEEP into the mass property weeds, but when you think of what a club head weights and how every half percentage point matters, five percent is a lot! That’s more forgiveness, more MOI, more spin control, and overall better performance.

2019-mizuno-mp-20-mmc-irons-3

What is also very cool is all of these parts (titanium and tungsten) have ZERO chemical bond—no epoxy. They all fit snug based on the shrinkage rates of the different materials. Ti & W( tungsten – W comes from the ore Wolframite) shrinks less than the steel so as the steel cools around the titanium and tungsten pieces it creates a mechanical (solid) bond.

All of this together adds up to an iron that looks smaller than the previous version, offers more “flow” in CG, something we mentioned earlier that creates more forgiveness and control throughout the set, and at the end of the day it means a better-engineered version than the one before it.

Hot Metal 2019 Mizuno MP-20 HMB irons

YES…you read that correctly. Mizuno is bringing Hot Metal tech to the MP line!

A hollow body blade looking iron using the same strong yet highly flexible Chromoloy material as the 919 Hot Metals except this time forged to create an iron like they never have before. The look and shape of a blade the speed of a Hot Metal.

Let’s break things down.

The look is clean as clean can be, from there the face of the HMB is thin and fast, while hidden inside the back of the club is complex geometry for both acoustics and precisely positioning mass. These will be the replacement for the MMC Fli-His but unlike that set, only going to the 6-iron, the new HMB will go all the way to the pitching wedge.

What is also different for the HMB vs. the MMC Fli-Hi is the way tungsten is used in the head to create different impact dynamics. The Fli-Hi had all the tungsten (20g worth) in one place in the head (low and towards the toe). The CG was still located right in the middle but through in-depth testing some players found that the Fli-Hi was a more difficult club to turn over and draw.

2019-mizuno-mp-20-hmb-irons

To improve the workability of the new HMB, the Tungsten was split into two 12g pieces (four more grams than previous Fli-Hi) and positioned into precisely formed pockets on the heel and toe in the back of the club. This allows the unsupported face to flex and makes the club more workable while still maintaining all the forgiveness you would expect from a hollow body iron built for speed. Seriously who doesn’t like the sound of that?

Since the new HMB is a full set and not just long irons, there is more to the tech story… here is comes… better flow and CG positioning throughout the set. This is hugely important for the mid and short irons where loft is already going to create spin so controlling ball flight and traj on approach shots is vital for scoring better.

This is again where the MP-20 Family discussion comes into play. Mizuno knows they are going to sell a lot more HMB long irons vs. blade and MMC long irons, so the entire family is designed holistically for every player to find each and every head that optimizes them on the course.

The Full Package

Like with previous generations going back almost a decade, Mizuno is keeping its industry-leading matrix of shaft and grip options available at NO upcharge. BUT… based on the growing demand for more exotic options the newly expanded shaft line up will include a few shafts that will come with a slight upcharge.

Whatever you end up being fit for, it’s important to realize that there has never been family of Mizuno irons designed like this, which could also mean you could be bringing home some new family members soon.

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