Bax,
For a 105 gram shaft, it's very stable during swings and plays better than most would think at that weight. If I were a fitter, I'd tell you to go with the shaft that feels best and performs to your liking. At the end of the day, you're the one swinging the club and need it to perform how you like. Usually, if you go down in weight, you can get away with a flex more than you're used to. When you go up in weight, think Modus 125 or 130, you would go same flex or even soft step that flex. Like I said, just go with what feel and perform best in that shaft.

Hey Anthony, thanks for the response and know what you’re saying, I’m pretty sure I’m going the regular hard stepped once, they feel good, but have never hit the 105’s, just the 120’s. Have you hit the 105’s?

Thanks for your time Anthony!!

No problem!

I have hit the 105 but very briefly. To me, they play similar to the 120 but I just didn't like how light they were. You might be surprised at how stable the 105 feels during the swing. A lot of people shy away from it because of the weight but it plays very different to how people anticipate it to play. I'd almost say you may launch the 120 higher than the 105. I know of people who have stated that before.

You are on the bottom end of stiff in terms of speed, but speed isnt everything. The main difference you should see is the 105 is worth a little higher ball flight and easier to square up the face. Since you are going from a 120 to a 105 you might still be able to play the stiff. I would look at your angle of descent with a clubfitter and go with the better trajectory. Also worth noting - during a fitting we see a lot of "batting cage" swings, on the course what is more comfortable when you are between clubs - full out 7 iron or dial back on the 6 iron. If you prefer to take more club and dial back i would lean reg. But still depends on trajectory.

Dave, thanks for your response, just what I was looking for. I was able to test both with a launch monitor with both the regular and stiff both launching around 20 degrees and angle of descent better with the regular at 46 degrees. The regular produced 3 mph of more clubhead and ball speed along with 4 more yards of distance. For only being 103 grams, they feel heavier because of its great balance. Coming from the LZ, I have a lot better trajectory which is lower, since I was ballooning the LZ.

I love your quote of being in a batting cage, so true, but yes I do take more club when I am between clubs for distance. Speaking of the 120, I did try them and they did feel good, but was a higher launch and not as good as numbers. We can have some windy days where I live.

Thanks again Dave and Anthony for your responses. Have a great rest of the golf season, I’m going forward to order them with the regulars, since my fitter said I have a smooth enough swing and moderate transition. They are some sharp looking clubs and feel great.

Bax, I just bought a set of srxn ZX-7(sorry Titleist;my only non-Titleist clubs in the bag) with the Nippon 120's stiff in them. I love the shaft. The 120's actually weigh 116 grams. I'm coming out of a set of png zz65 stiff which weighs 108.

The Nippon is smoother, and a little softer in the middle.The 105 is too light for me, but I love the 120.

Which flex? According to Nippon the weights of 120 vs 105 really aren't that far off from each other

nipponshaft.com/.../brand_steel.php

Stiff.

I have played with both flexes in my current irons and cannot really tell a significant difference. However, the R flex does launch the ball higher sometimes. The feel is very similar.

Hope this helps,
Cheers Chris

Titleist fitted me for 105 S in my 2020 T200 5-9. Vokey 48.10F has 105 S, and 52.12F and 58.10S have 120 S. I don’t feel the added weight, and they feel solid on partial shots.