Diamana B Series Shaft Review

Diamana B Series Shaft_0038

50 Words or Less

The Mitsubishi Diamana B Series shaft finds the perfect middle ground between stability and feel.  A great fit for all the “middle of the bell curve” players who are neither the fastest nor the slowest swingers.


Whether it’s the original Blue Board, the second generation Kaili, or the B Series, there’s a reason that huge numbers of golfers flock to blue Diamana shafts: they deliver balanced performance without making significant compromises in any area.  With the B Series, Mitsubishi Rayon has used the latest in materials and design to give golfers the smooth feel that they want without giving up accuracy or consistency.

Diamana B Series Shaft_0034


To me, the Diamana B Series is the perfect blend of feel and stability.  The original Blue Board was smooth, but could have been a little smoother.  The Kaili was smoother, but a little too tip soft for some.  The B Series, however, is just right.  Even dialed-down swings make the shaft load and kick through the ball, but the tip is stiff enough and the torque is low enough that it never feels loose.

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Sporting a combination of matte and gloss blues, the B Series is a stunner.  At a glance, it’s a simple blue shaft with nothing to distract the golfer at address.  Upon closer inspection, you can see the Hawaiian-style graphics above and below the Diamana name and the signature flower band near the grip.

B Series LM Data

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It’s not entirely fair to say that I “tested” the Diamana B Series – after deciding to play the PING G30 driver, I worked with Club Champion to determine that this was the best shaft for me in that head.  The reason, of course, is that the numbers that it produced were about as good as they can possibly be.  As you can see, the B Series produced high launch with sub-2000 RPM spin, the necessary combination for maximizing distance.  Just as importantly, the ball speed was excellent…relative to my limited swing speed.

What really put the B Series over the top for me was the consistency.  I attribute this to a combination of the balance and the feel.  In the 70 gram model that I play, the club doesn’t feel too heavy in the butt or the tip, but it has nice heft throughout (the B Series is also available in 50, 60, and 80 gram models).  Equally important is the consistency.  Swing after swing, whether it’s smooth or all-out, I get the same response from the shaft.  This allows me to make aggressive, confident swings with excellent results.

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The latest version of Diamana’s Blueboard, the B Series, is one of the best shafts available for the majority of golfers with “normal” swings.  It’s not the highest launching nor the lowest spinning, but if you want smooth feel, balance, and stability, you’ll be hard pressed to find anything better.

Matt Saternus
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  1. Paul Adams

    Nice review.
    How does the B series compare to the new S+ which is standard in the new Nike Vapors?

    • Matt Saternus


      Both series of shafts can be good performers – if well fit – but they feel entirely different. The Diamana shafts have the best materials and feel fantastic. The +Plus series are fine but nothing special, in my opinion.



      • Paul Adams

        But the S+ is a Diamana.
        I assume the B Series is a real Diamana and not a made for?

        • Matt Saternus


          Mitsubishi has changed the way they do stock shafts. It used to be that they made the top-end Diamana for aftermarket sale and then did “Made For” shafts for Titleist, Nike, etc, which were labeled as such. Now, instead of doing made for, they have the Plus+ Series which is sold both as stock shafts and as an aftermarket option. Yes, all the shafts have the Diamana name on them, but, in my eyes, only the aftermarket-only shaft is a “real” Diamana.

          Again, you can get great results with the $400 Diamana or the Plus+, but don’t let anyone tell you they’re the same thing.



  2. Paul Adams

    Understood, thanks Matt.
    I will go and buy one and give it a head to head against the stock Diamana in the Nike Vapor Pro.

  3. Hi Matt how much stiffer is the 70s compared to the 60s? I see there is a half degree of torque difference?

    • Matt Saternus


      I only tested the 70S, so I can’t comment knowledgeably about the 60S or 60X. I would recommend being fit to find the best shaft for you.



  4. Will the 60x play stiffer than the 70s?

  5. david mc dowell

    hi mat i see you play this shaft in your ping g30 driver how long is the shaft and what swingweight did you get. if u change a shaft do u have to get the same swingweight back ??/

    • Matt Saternus


      I play my driver well below “standard” – 44.5″. To be honest, I don’t know the swing weight. I’ve never been caught up in the exact number, I just like a club with a little more weight to it. Generally speaking, since I play heavier shafts, I don’t lose too much swing weight, even with the shorter length.

      There’s no rule that says you have to play the club at its stock SW, so no, you don’t need to change it when you change shafts. I would make a note of the stock SW if you like it, however, so you can get back to that feeling with the new shaft.



  6. Hi Matt,

    Thanks for the review, and it’s great review btw.

    I’m in the middle of choosing between B-series vs Kai’li.
    What do you think if the same spec B-Series and Kai’li (weight, flex, length) put in the same head ?
    Would it be higher or lower lauch or spin ”

    Thanks before.

    • Matt Saternus


      There’s no way for anyone to guess which will spin more. On spec, I think the B Series will spin less due to a stiffer tip, but any knowledgeable fitter will tell you that a stiffer tip does not always mean lower spin. You need to hit both to see what they do for you.


  7. Hey Matt,

    I recently bought both the Titleist 915 hybrid and Fairway wood with the stock Diamana S+Plus 70 gram shafts. I was wondering if the stock shafts are the same as the aftermarket version, because the fairway wood shafts go for around $300 yet I only payed $340 for the entire club!

    Thank you!

    • Matt Saternus


      The S+ has very little in common with the Diamana B Series.



      • Hey Matt,

        Thanks for the response, but I was actually wondering whether or not the S+ stock shafts are the same as the S+ shafts that you can buy separately from Golf town or Golf smith as they go for a little under 300 as well! Once again, thank you.


  8. Great,
    Thanks Matt.

  9. Hi Matt,

    I currently have been playing the real Diamana Kai’li in my Titleist 913D2 driver and 913F 3-wood for four years now and love them. My question for you is, are the new Diamana s+Plus that come stock in the 915’s of the same quality?

    Thanks in advance.

    • Matt Saternus


      By “same quality,” what do you mean exactly?



      • Which is the better shaft? I am assuming the real Kai’li is based on it being a true aftermarket shaft versus the S+ which is one of the stock options.

        • Matt Saternus


          There is no universal “better.” There are differences between aftermarket and stock in terms of material and quality control tolerances, but the Kaili and S+, though both based on the Blueboard, are different and will work differently for different players.



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