PluggedIn Golf - Does Shaft Weight Matter More Than Shaft Flex

By PluggedIn Golf

Golf Myths Unplugged

The average golfer pays a lot of attention to shaft flex. When they go to buy a new club, they “know” that they need a particular flex (despite the fact that there are absolutely no industry standards).

What the average golfer pays no mind to is shaft weight.  Most couldn’t tell you the weight of the shaft on their current driver or the one they’re lined up to buy.

Talk to the average fitter, however, and they’ll tell you that weight is critical. For some, it’s the first thing that they fit for. We wanted to find out what really matters, so we put flex and weight to the test.

The Myths

Myth #1 – Shaft flex is more important than shaft weight
Myth #2 – Heavier, stiffer shafts are only for faster swingers
Myth #3 – Heavier, stiffer shafts prevent hooks
Myth #4 – Heavier, stiffer shafts launch lower and spin less
Myth #5 – Heavier, stiffer shafts are more accurate and consistent

How We Tested

For this test, we brought together seven testers with swing speeds ranging from around 70 MPH to over 110 MPH. Each player hit seven drives each with five different Nippon Regio Formula MB shafts: stiff flex at 55, 65 and 75 grams, and 65 grams in regular, stiff and x-flex. Every player hit the shafts in a different order, and every shot was captured on TrackMan.

Testing was done at, and with the help of, Club Champion.


The Results

Myth #1 – Shaft flex is more important than shaft weight

In this test group, weight proved to be slightly more important than flex. That said, one different tester could have tipped the scales the other way. Both weight and flex are critical elements in picking the right shaft.

To evaluate the relative importance of weight and flex, we looked at swing speed, ball speed, carry distance, and total distance. For each metric, we looked at the gap between the players’ best and worst weight and flex. The average and median differences were higher for weight – though the gaps were small – which indicates that weight is slightly more important.


Myth #2 – Heavier, stiffer shafts are for faster swingers

We had testers in our group swinging from around 70 MPH to over 110 MPH. This gave us ample opportunity to see if weight or flex tracked consistently with swing speed, but we saw nothing of the sort.

Our slowest swinger did perform best with the lightest shaft, but her best flex was x-flex – a result no one would have predicted. On the other end of the spectrum, one of our 100+ MPH swingers was best with a regular flex. Our players in the middle were all over the board in terms of weight and flex preferences.

Once again, we see that there are no hard and fast rules when it comes to fitting, even about things as “simple” as flex and swing speed.


Myth #3 – Heavier, stiffer shafts prevent hooks


Our testers were just as apt to hit shots to the left with a heavy shaft as a light one. Whether we looked at the biggest misses or the overall dispersion, we saw no correlation between shot direction and weight or flex.


Myth #4 – Heavier, stiffer shafts launch lower and spin less


Let’s start with spin. Some testers did have their lowest launch and spin with the heavier, stiffer shafts, but one player spun the heaviest shaft the most and three players spun the stiffest shaft the most. 

The results for launch were even more contrary. Three players launched the heaviest shaft the highest and two players launched the stiffest shaft the highest.

If you need lower launch and spin, going to a heavier, stiffer shaft is not necessarily the way to go.


Myth #5 – Heavier, stiffer shafts are more accurate and consistent


Once again, we see that simple rules don’t hold up. You can’t get more consistent or more accurate simply by getting a heavier, stiffer shaft.

When we looked at distance consistency, the results were a perfect bell curve: most were best with the middle weight and an equal number were best with the light and the heavy shaft.

We saw a similar picture with accuracy. Whether we looked at average offline or the left-right spread, there were players who were best with light, mid-weight, heavy, regular, stiff, and x-flex.

Additional Findings

In talking to our testers about what they felt, the one thing that stood out was the impact of weight. Six of the seven testers said that the difference in weight was significantly more noticeable than the difference in flex. The seventh tester claimed to feel both changes equally.

Additionally, every player instantly knew when we had changed the weight. Some testers – even better players – either didn’t notice the difference in flex or misidentified the change.


The takeaway, once again, is that there are no hard and fast rules when it comes to club fitting. Both weight and flex can have a significant impact on the performance of a club, so both should be given adequate attention during a club fitting.

The Data