TaylorMade RSi2 Mizuno JPX850 Forged Irons

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TaylorMade RSi2 Mizuno JPX850 Forged Irons reviewed and tested by Mark Crossfield PGA professional AskGolfGuru. Mark hits the two golf clubs and talks launch, spin and distance. See which iron might help you play some better golf from Mizuno and TaylorMade.

28 thoughts on “TaylorMade RSi2 Mizuno JPX850 Forged Irons

  1. Mark, I commented on boron in golf clubs when you first looked at the 850s:

    Boron is a relatively rare metallic chemical element (symbol B) which sits
    between Carbon and Beryllium in the periodic table.
    As you probably know, steel is made from combining Carbon (C) with Iron
    (Fe) which enhances the strength, hardness and weight of the resulting
    metal. As you differ the ratio of C to Fe, so the resultant steel has
    differing properties (for example, more C generally means the steel is
    harder but less easy to shape).
    Other elements can be added to steel to change other properties; Nickel
    (Ni) and Manganese (Mn) increase tensile strength (e.g. drawing the steel
    into long rods), Vanadium increases hardness while decreasing metal fatigue
    (good for things like airplanes!) and the addition of Boron also has an
    effect.
    During the end of the process of making a steel object, it is typically
    heated up and then quenched in liquid. This changes the steel from one
    microscopic structure to another – the second one being stronger. However,
    this cooling process has to be quick and it is not always even. The thicker
    an object is, the slower the inside of it will cool and hence the greater
    the variance in hardness of the finished object.
    This is where Boron comes in! If you add very small amounts of it to steel,
    it increases a property called “hardenability”. This is a measurement of
    how easier it is to harden a steel object uniformly throughout its
    structure.

    So the Mizuno irons should have a more uniform hardness throughout their
    structure.

    How this translates to the club in your hand, I don’t know. I’m crap at
    golf.

  2. Here is my issue with you Mark, when you reviewed Nike Pro Ltd with
    compression channel you praised it. Helped on miss hits by increasing ball
    speeds when you hit it out of the bottom. The slots do the same thing as
    compression channels. I don’t think TaylorMade have said they are the only
    ones to do this or that they invented the idea. Just that they have
    developed another way of doing it. Tom Wishon introduced variable face
    thickness on irons 10+ years ago. But if TaylorMade has the money to market
    their ideas I think that is part of being in business. At least it’s not
    17+ further blah blah blah. 

  3. Boron has a very high strength to weight ratio. I assume it is because of
    this that Mizuno are looking to include it in their clubs. I am sure it is
    nothing to do with marketing…#cynical

  4. Hello Mark, regarding the issue of comparing different irons in your head
    to head comparisons, and an individual’s aggressive comments that you need
    to stop this on YOUR CHANNEL … Although I appreciated your efforts to
    explain this, you did not need to, as there is a quite easy way for this
    individual to stop seeing this abominable practice of comparing different
    irons … They can stop watching at any time. How absurd to believe they
    can tell you how to run your business. Sure, make some recommendations, but
    to make this type of demand with the expectation that you should heed their
    demand is ridiculous. Keep up the great work, you make this tough game a
    lot of fun for so many, and it is appreciated.

  5. If there is a chance of slots working (and I’m not necessarily saying that
    there is), it would be with the fastest club in the bag – the driver.
    Plus, the slots on drivers are not filled with resin (or other material),
    so there is the possibility of some give (which is supposedly the whole
    idea behind the slot in the first place).

    However, cutting slots in irons (slower swinging clubs) that are then
    filled in with resin sort of defeats the purpose of having the slots in the
    first place. Sure, resin may have slightly more give than steel but we are
    now talking in such minute amounts, that’s its not worth talking about. To
    me it seems marketing crapola.

  6. Hey Mark! It would be great if you could do an iron comparison between an
    older club from 5-6 years ago to the irons coming out now. I’m currently
    gaming Taylormade r9 tp irons, and I’m wondering if there’s a significant
    difference between these clubs and maybe the rsi2 irons. 

  7. Very good video!
    As a person with some mechanical engineering background, I have to say This
    slotted TM iron does not convince me at all.

    Theoretically, if these slots really does work as trampoline, then the miss
    hits can not have the same distance as the centered hits as the centered
    hits will always send the balls further than the one closer to the edge.

    

  8. I think most people are missing the point of Mizuno including Boron in the
    forging process. As people have said it strengthens the steel, and the
    reason to strengthen the steel is to enable them to make a thinner face in
    a forged club. Nothing more than that. 

  9. Mark, thx for the review. I have a suggestion. Since you are a pro golfer,
    naturally you hit the sweet spot more often than most of us. And these
    clubs all perform the same when you middle them. What I want to know is if
    you purposefully hit them on the toes or anywhere outside of sweet spot,
    would they still perform the same? 

  10. Thanks for enlightening me Mark. Due to their advertising I thought
    Taylormade had done something far beyond any other company with regards to
    mishits. Was seriously considering replacing my tired G10’s with the RSI
    1’s. I will definitely give the others a good look now. (really like the
    JPX 850’s, unforged).

  11. mizuno 850forged 5i – 25degrees – length: 37.75″ Swing weight:D2-D3
    TM: RSi2 6i – 27degrees – length: 37:25” Swing Weight: D2
    The numbers you’re getting are very much the same i’d say. Just commenting
    for some people who claim this and that degrees jadda jadda jadda…

  12. I just don’t take much away from 3 shots vs. 3 shots. Especially with a
    27-degree vs. 25-degree. And 1/2 inch length difference between them. Just
    so many variables, you can’t learn anything from comparing 3 shots. 

  13. what happens when you play in the wet and in muddy ground. Will those slots
    fill up and need constantly groove like cleaning? And same with bunker
    shits… will sand be hard to get out?

  14. Adding boron to steel usually hardens it a little, Mizuno are just tweaking
    the physical properties of the steel. It also promotes certain changes to
    the grain structure of the alloy which might be the real reason Miz are
    using it – they like that sort of thing – grain flow forging etc etc

  15. I don’t think Mark was doing any bashing to me it sounds like he saying
    don’t caught up in the marketing other clubs has tech in it that will give
    you forgiveness. These days you can’t compare clubs brands 6 for 6 because
    the loft are all over place.

  16. Is it possible that the slots on the face don’t do much physically but
    maybe mentally where you feel like you can make a more solid swing at the
    ball without worries about a mis-hit. 

  17. Hey, Mark. Thanks for all your videos and hard work. Quick question: I’m
    trying to build an indoor swing studio. What brand/kind of cameras do you
    have and what’s your overall setup? Thanks for your help.

  18. Seems like we need do try and out coach you to get a response mark. Come on
    mate show some love to those who are supporting you. #parfieldarmy 

  19. Mark, quick question. To start, I would like to say that I have been
    watching your videos for a little over a year and a half now and I
    absolutely love them and your approach to the game. I was wondering what
    your thoughts were on how the RSI2 6 iron is launching (angle, spin) like a
    typical 6 iron and the JPX 850 5 iron is launching like a 5 iron even with
    only 2 degrees of static loft difference. I understand that the lofts are
    very close to each other, but is it possible that TM is cranking lofts in
    their irons to get the same launch characteristics and not solely for more
    distance (like the Titleist rep in the AP 2 review video said Titleist was
    doing)? I noticed this is the RSI 1 vs AP 1 video also. Just wanted to
    hear your explaination.

  20. Tried these when a mizuno rep came to our range. Far to hard to hit
    everytime. Then tried the normal 850’s. Straight as an arrow and gained 20
    yds!! 

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