Reference
The Shaft Page We Kept Having To Write By Hand
Golfers arrive with a flex letter and a brand name and very little else, because that is all the market gives them. This is the rest of it, written the way we explain it at the bench.
What We MeasurePer shaft
- Butt frequency, grippedcpm
- Raw weight before trimgrams
- Balance point from buttinches
- Tip trim appliedinches
- Torque as publisheddegrees
Start Here
A Flex Letter Is A Marketing Decision
There is no industry standard behind the letter printed on a shaft. One manufacturer's stiff and another's regular can measure within a couple of cycles per minute of each other, and two shafts sharing a letter from the same manufacturer can sit two full steps apart once they are trimmed and installed.
That is not a scandal, it is just how an unregulated label works. It does mean the letter is close to useless as a starting point, which is why the first thing that happens to a shaft in this room is a trip to the frequency meter.
Frequency is measured in cycles per minute with the butt clamped and a known mass on the tip. It gives a repeatable number that can be compared across brands, across models, and across the set you already own. Two shafts at the same cpm behave far more alike than two shafts sharing a letter.
Rough frequency bands, driver length
| Band | Butt cpm |
|---|---|
| Very soft | 218–232 |
| Soft | 233–245 |
| Middle | 246–258 |
| Firm | 259–270 |
| Very firm | 271–284 |
Where you land depends on tempo and transition load as much as on speed. Two golfers at the same clubhead speed can sit three bands apart and both be correct.
Weight
Weight Decides More Than Flex Does
If we could only change one shaft property, it would be mass. Shaft weight moves total club weight, balance point, and the effort required to deliver the head on a repeatable path — and repeatability is exactly what ball speed retention depends on.
| Club | Graphite | Steel | What moving 10g usually does |
|---|---|---|---|
| Driver | 45–80 g | — | Heavier tightens the strike pattern, lighter adds peak speed and spread |
| Fairway wood | 55–90 g | — | Heavier steadies turf entry from tight lies |
| Hybrid | 65–100 g | 95–115 g | Heavier moves feel toward the iron end of the bag |
| Irons | 55–105 g | 95–130 g | Heavier lowers launch slightly and calms the low point |
| Wedges | 70–115 g | 115–135 g | Heavier improves control on partial swings |
Lighter is not automatically faster
Dropping shaft weight nearly always raises the fastest strike of a session. It also tends to widen the gap to the worst one. Whether that trade helps depends entirely on which end of the distribution your scorecard lives on.
Steel is not automatically heavier
Lightweight steel now overlaps the graphite range in irons. The choice between them is more about damping character and how the shaft behaves through turf than about the number on the scale.
Weight has to be consistent across a set
A mixed bag where the 7-iron is 40 grams heavier than the hybrid immediately above it in the yardage order teaches a golfer two different tempos. We check the whole ladder, not one club.
Trim
The Same Shaft, Three Different Clubs
Tip trimming is the least discussed and most consequential thing that happens to a shaft between the box and the bag. Cutting from the tip stiffens the section that loads most under delivery. Cutting from the butt changes overall length and softens the feel far more gently.
A manufacturer's chart will list a tip trim for each club position in a set. Follow it and the set behaves as designed. Deviate deliberately — a half inch less tip trim on the long irons, say — and you have effectively built a softer profile at the top of the set without changing shaft model. Deviate accidentally and you have built a set nobody can explain.
Everything gets recorded. Raw length in, tip trim applied, butt trim applied, finished playing length. That is four numbers per club on the bench card, and they are the four that make a future replacement match.
- Tip trim, driver, typical0–1.5 in
- Tip trim step per iron position0.5 in
- Butt trim to finished lengthas measured
- Frequency shift per 0.5 in tip trim~4–6 cpm
Bend Profile
Where A Shaft Is Stiff Matters More Than How Stiff It Is
Two shafts can measure identically at the butt and behave nothing alike, because stiffness is distributed along the length rather than concentrated in one figure.
A shaft that is soft in the mid-section and firm at the tip will feel loaded through transition but resist at delivery. Flip that distribution and the same golfer gets a very different launch and a different sense of where the head is. Neither is superior; they suit different transitions.
We do not ask golfers to guess at this. It shows up in the strike census. A profile that fights your transition produces a scattered pattern almost immediately, and a profile that agrees with it tightens the pattern within six swings.
Reading a profile without the marketing
- Butt section — governs the sense of load at the top of the swing and most of what a golfer describes as feel.
- Mid section — carries the bend during transition and has the largest effect on where the head sits at delivery.
- Tip section — controls launch and how much the head is allowed to release through the ball.
- Torque — resistance to twisting; useful within a model family, close to meaningless when compared across brands.
Published profile charts are a starting point for a shortlist, not a decision. The meter and the census settle it.
Bring The Shaft You Have Questions About
A frequency and weight check on a single club takes about twelve minutes and does not require a booked session. Call ahead and we will have the meter clear.
4120 Monona Drive, Suite 6