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.

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Tr33fiddy says:

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
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

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

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

french13 says:

If you had used two 6 irons that would have been a 4 minute vid and my
brain wouldn’t be hurting right now.

Thomas Barker says:

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. 

Liam Shaw says:

This 5 iron vs 6 iron crap has to stop. How can you try and compare two
different irons. Not the first time you’ve did this.

Jeffrey Trigger says:

You’re saying it’s the indian, and not the arrow? But I have to hope

27G27G27 says:

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

mike hunt says:

This has to be the dumbest gimmick I’ve ever seen in a golf club TM are
just getting worse and worse.

Louis DeSantis says:

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.

Google-is-a-pain says:

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.

stephen kim says:

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. 

TheGolfdaily says:

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.

Tom Cooke says:

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. 

Jonathan Chang says:

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? 

Jack Pacleb says:

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).

Robin0830 says:

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…

nova68nova says:

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. 

itubeutude says:

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?

Doug Booth says:

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

Preston Anderson says:

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.

speterj says:

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. 

MahanFan1 says:

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.

Christian Kostakis says:

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 

Travis Tibbs says:

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.

J@D W says:

Eureka business idea – practice balls which leave a washable mark on the
iron face.

bullett bangs says:

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

jim mcmahon says:

Mark – You’re clearly anti TM for some reason..

L Dupree says:

Why in the world wouldnt you compare identically lofted irons? Makes no

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