Project X PXi Golf Shaft Review

Project X PXi Iron Shaft from True Temper

By Russ Ryden, A Golf Digest America’s 100 Best Clubfitter
Fit2Score, Dallas Fort Worth, Texas

ProjectX_PXi_imageTT_PXvsPXi_EiIron shafts are getting lighter. Lighter means faster, it means more maneuverable. Think of the difference between a Carbon Fiber Lamborghini and a Heavy Metal Chevy. The light weight Lamborghini accelerates quicker, there is less weight to get moving. It corners quicker because it has less centrifugal force acting on it. The Project X PXi is a lighter faster Project X. The 6.0 model lost 12 grams of weight and 2 pounds of butt stiffness. Does it work? Ask Jason Dufner and Ian Poulter, they are both using it. And we have Tiger and Rory using it in their utility/driving irons.

Loss of weight typically means loss of stiffness. As you can see, the average stiffness profile of the PXi is softer than the average stiffness of the Project X. Once again, we see stiffness numbers on a shaft that do not indicate an absolute reference. Do not take that comment as a criticism of True Temper. It is the same scheme used by every shaft company. That is one of the many reasons that club fitting is so critically important to game development.

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Enjoy and Good Golf,

  • Mike

    Russ, looking at TW’s Profiling software the 6.0 PXi and KBS Tour S seem to have a similar profile with the PXi being slightly softer throughout. The graphs in your reviews seem to suggest otherwise with the PXi slope ‘stiffening’ slower from the tip than the KBS. Of course without the actual ## it is hard to tell from the ‘thick’ graph lines. Any chance of posting the raw numbers in addition to the graphs?

    • DevotedGolfer

      The Project X was designed by Kim Braly at Royal Precision. The PXi is a lighter version of the Project X. Lighter means softer in most every shaft I have measured and the PXI compared to the PX is no exception. The 6.0 PXI and the 6.0 PX have similar bend profiles but different overall stiffness.

      I cannot comment on what is seen in the Wishon software, I stopped using it a very long time ago. The instrument on which the measurements are taken is crude ($500 vs $3000) compared the the instrument I developed. Frequency is one method of measuring EI, three point deflection is another. And comparing the two systems could be a very long article. However, because I no longer have any day to day experience with the Wishon software I am long since past the point where I could discuss it other than from a theoretical perspective of the instrumentation. We are now making the next generation EI instruments and will be once again offering them for sale. In the past access to the actual numbers was restricted to the owners. Perhaps that will change if we develop this site into a subscription based place for professional access to the data. But for the moment the actual ## are a shared asset of the instrument owners. Those owners are shaft companies and professional fitters.

      A quick look at the actual numbers shows the two models you mention as very consistent designs within the respective models but quite different from each other. The KBS Tours descend gradually from butt to 11″ from the tip where the then turn up toward the tips. The PXi drops steeper to 17″ and turn up from there. The KBS Tour exhibits a propensity to launch slightly lower than the PXi. I have no idea what the Wishon software shows you. When I lay these two models on top of each other they are quite similar with a subtle change on the low mid region.

      Hope this helps,

      • Mike

        Thanks for the reply. I figured the difference in measuring methods (deflection vs. freq) could be an issue. I understand your position on the ## and would definitely be interested if you were to go for a subscription model. I bought Tom’s program for the same reason: never too much data :). Looking past the initial freq data that prompted my initial question, I do see a difference in EI data, which I’m still trying to find out how to interpret exactly (not EI as such, merely the data itself). It does however seem to rhyme with your answer and with my own (subjective) observations. Since it is my first experience with fitting the PXi I thought it wise to gather as much data as possible.

  • don

    Russ, I’m now retired from my PGA tour rep. job and enjoying my golf and fly fishing!
    Before leaving the states I had a set of Project X- PSI 5.0’s sent to me. Re shafted my
    irons and have used them for a while. I’m a person who goes by feel and sound in all
    equipment. The PSI shafts perform well, but the feel is a little hollow and hard ………maybe because of the thinner wall of the shaft? If you catch your shot on the
    sweet spot it feels better. And with age I don’t catch that spot as in the old days? So to make a long story short I put my older XP Dynalite Gold R 300’s back in and the feel
    was back? Also my son who is on scratch had a hit, and with out any feed back from me said the shaft felt hard and light. He then hit DG’s and it was better. Just wanted to get your comment and if you had any other feedback. Thanks, Don

    • DevotedGolfer

      I have not heard that, but I have the PXi’s in a fitting cart and will try to get out and have a few others give some feedback. Like you, I am a feel good fitter. In looking at the EI profiles I don’t see an indicator of the feel you describe. The tip and butt of the PXi are softer than the DynaLite Gold XP R I have measured. It must be material. Your question is of great interest to me, thanks.

  • Toby Lim

    Is spine alignment important when reshafting with the project x pxi 6.0?

    • DevotedGolfer

      Spine alignment is never important with quality shafts. There are a lot of opinions about spine alignment, but zero published research. My opinion is expressed in this article:

      The term ‘spine’ is not well defined even among club makers. I made a video discussing it some time ago. which I have not watched recently. It is a good overview of the term, ‘spine’.

      My current opinion, if a shaft has enough difference between weak and strong planes. It belongs in a dumpster, not a golf club. If there is little difference, there is no value of orientation. I really need to remake that video.

      This is another article I wrote along the discovery path:

      My current practice is to find the two FLO lines and get the oscillation frequency of each. Less than 2% difference, tour grade shafts, less than 5% more than 2%, recreational golfer grade, more than 5%, dumpster grade. There are very few quality shafts that are more than 5%. Most fit into the category of tour grade with today’s manufacturing processes. But you will never know if the shaft in hand is OK or not until you check it. Unfortunately, you need both a frequency instrument and the knowledge of how and why it works to check your shafts. Don’t waste your time or money on spine alignment.

  • Tommyboy1

    Russ, I sent you a note earlier regarding a project x 6.0 7i and 4i breaking in the middle of the grip. I have an additional question: Is the PXI 6.5 stronger in the butt than the projectx 6.0? Again, do you have any thoughts on why the two irons would break in that manner? They broke in normal usage (hitting range balls) and there is no visible evidence of any rust. The breaks were very similar: relatively clean breaks in the middle of the grip. Thanks!