The wrong shaft
is costing you
shots.
Most golfers play whatever shaft came in the box — chosen for the median buyer, not their swing. We score 548 shaft specifications across ten weighted modules, matched to your speed, your tempo and your irons. The result is a percentage match that is specific to you.
A shaft is three sections doing three different jobs.
Drag the kick-point slider to move the shaft's soft zone. Watch the stiffness curve, launch angle and ball flight react in real time.
How the fitting actually works.
Ten modules. One number.
Brand shaft charts match one variable — usually driver speed — to a flex category. That is not fitting. Play your Shaft scores every shaft in our matrix across ten independently weighted modules, calibrated to variables that genuinely determine whether a shaft performs well for your swing. Two separate fitting flows — one for iron shafts, one for wood shafts — each with its own database, its own questions and its own scoring engine. The output is a percentage match specific to you: your speed, your tempo, your irons and your priorities.
Physics does not care about the box it came in
The shaft bundled with your irons was chosen because it suits the manufacturer's margin, not your swing. Most OEM stock shafts are built to a specification that fits the median buyer in that iron's target market — which means they are genuinely right for a minority of the people who buy them.
A shaft that is 10 grams too heavy will slow your tempo over 18 holes. A kick point too high for your speed robs you of launch. A tip section too soft scatters your misses wider than your technique deserves. None of these problems appear on a brand chart. All of them appear in the algorithm.
What the ten modules measure.
Each shaft in the matrix is scored against your profile across ten modules. They represent the variables that most consistently determine whether a shaft performs well or poorly for a specific golfer — not what looks impressive on a spec sheet.
What your results look like.
The fitting returns two layers. Your performance profile first — the specification your swing needs. Then the specific shafts that match it.
Iron shafts, wood shafts, or both.
Two separate fitting flows. Start with irons, woods, or run both.
Start fitting→Flex & weight
The two most fundamental variables in both iron and wood shaft selection. For irons, weight governs consistency across a full set. For woods, it governs dynamic loading at maximum swing effort. Getting both wrong costs you distance and accuracy on every shot you hit.
Launch window
Every golfer has an optimal launch window — a combination of launch angle and spin rate that maximises carry distance and trajectory control. The kick point and EI profile of a shaft determine where within that window your ball launches from your irons.
Torque & dispersion
Torque is the shaft's resistance to twisting at impact. It is more consequential in wood shafts — the longer lever amplifies face rotation — than in irons. Low torque tightens your driver dispersion. High torque widens it. The right torque band depends on your swing speed and path.
EI profile
The EI profile describes how a shaft's stiffness changes along its length — from butt to tip. It determines not just launch and spin but distance consistency across the face. A well-matched EI profile makes off-centre strikes more forgiving and predictable.
The variable nobody talks about. EI profile.
Two shafts can share identical flex labels, identical weights and identical kick points — and produce completely different ball flights. The reason is EI profile: how a shaft's stiffness changes from butt to tip. Our algorithm scores every shaft in the matrix on its EI profile, not just its flex label.
A shaft with a soft tip and stiff butt loads and releases differently from one that tapers gradually. These differences determine launch angle, spin rate and feel at impact — none of which a flex label can tell you.
Three tools. Deeper understanding.
Weight, flex, kick point and torque all interact with your swing. These tools isolate each relationship so you can see the physics before the algorithm runs. All three use 7-iron speed as their reference — the same measurement as the fitting.
A 10-gram change in shaft weight affects tempo, swing feel and consistency across a round. Weight and flex must be matched together — not separately.
Two shafts can have identical flex labels but very different torque values. That difference shows up in how tightly your shots group, even with consistent contact.
Kick point position is the primary determinant of launch height from your irons — a factor of shaft design, not swing technique.
The shaft database every fitter wishes existed.
Our matrix covers 548 shaft specifications — 157 iron shafts and 391 driver and fairway wood shafts — every major manufacturer, every tier, from stock to tour-level. Each specification is cross-referenced against ten weighted scoring modules, calibrated to real-world launch monitor data.
The scoring engine is consistent with TrackMan research on weight and tempo interaction, True Temper EI profile studies, USGA technical standards on flex and ball speed, and Foresight GCQuad dispersion and torque data. It is not a flex chart. It is a genuine fitting algorithm.
In-person. Launch monitor precision.
The online tool gives you a data-driven recommendation from the information you provide. An in-person session removes estimation entirely — real measured swing data fed into the same algorithm produces the most precise recommendation possible.
Questions, answered.
The questions we hear most often about shaft fitting, flex, weight, kick point and how the algorithm works — answered plainly.
No. The fitting is designed to work with whatever data you have. If you know your 7-iron swing speed from a fitting bay or golf simulator, enter it directly. If you haven't been measured, the tool provides a proxy path — you enter your typical 7-iron carry distance instead, and the algorithm maps that to the equivalent speed band. The recommendation is valid either way, though measured data produces a more precise result.
Iron shaft fitting should be based on iron swing data, not driver data. Driver swing speed is affected by shaft length, tee height, launch angle optimisation and the player's intent to swing hard — none of which apply to irons. The 7-iron is the most universally measured club in retail and fitting bay environments, and provides the most reliable reference point for the fitting algorithm.
Both matter, but for different reasons. Flex primarily affects launch angle, spin rate and the timing feel of the swing — a mismatched flex produces a shaft that either feels too stiff (cutting spin and height) or too soft (ballooning the ball and losing control). Weight affects swing tempo, consistency and fatigue: too heavy and your swing breaks down over 18 holes; too light and you lose proprioceptive feedback and control. The algorithm matches both simultaneously.
Brand recommendation charts match a single variable — usually driver swing speed — to a flex category. That tells you almost nothing useful. Play your Shaft scores 548 shafts across ten weighted modules that account for your swing speed, tempo, ball flight tendencies, iron type, feel preference and playing priority. The result is a ranked list of specific shafts with a percentage match score and full rationale — not a flex category pointing you toward whichever shafts that brand happens to make.
Yes. The shaft matrix includes both steel and graphite iron shafts across all weight bands, flex profiles and price tiers. The algorithm accounts for the material difference — graphite shafts behave differently from steel in terms of weight, feel and vibration dampening, and those differences are reflected in the scoring. You can specify a material preference in the fitting, or leave it open for the algorithm to recommend whichever material scores higher for your profile.
The fitting is optimised for iron shafts (typically 3-iron through pitching wedge). Most shafts in the matrix are rated for wedge compatibility, and the results include a wedge-compatible flag where relevant. Dedicated wedge shaft fitting — which involves different variables including shot shape, feel at short distances and spin control on partial shots — will be a separate tool in a future build.
The algorithm is identical in both cases. The difference is data quality. The online fitting works from the information you provide — which may include estimates. An in-person session with a launch monitor replaces every estimate with a measured value, which means every module can be scored with full precision. For most golfers, the online fitting will identify the correct shaft family and flex profile. The in-person session confirms the exact shaft within that family.
Absolutely. The fitting works for every level of golfer. In fact, shaft fitting often has a more dramatic effect on higher-handicap players than on scratch players — because a poorly matched shaft exaggerates swing faults, while a well-matched one makes the game more forgiving. The algorithm does not make assumptions based on ability level. It responds to your actual swing data and playing preferences, whatever they are.
Yes. The fitting runs as two completely separate flows — one for iron shafts and one for wood shafts (driver and fairway woods). The questions are different because the variables that govern driver shaft performance are genuinely different from those that govern iron shaft performance. Your swing speed, attack angle and transition are more critical for wood shaft fitting; your iron type, strike consistency and trajectory are more critical for iron fitting. You can run one or both, and your profile is saved to your account either way.
Not necessarily. It is a common misconception that a golfer who plays Stiff flex irons should automatically play a Stiff driver shaft. The two swings are different enough — different club length, different swing intent, different attack angle — that the optimal shaft profile for your driver is often different from your iron profile. Many Tour players play Stiff irons and X-Stiff driver shafts. The fittings are designed to be independent for exactly this reason.
Questions about shaft fitting?
Have a question about the fitting process, want to understand your results, or just want to talk shafts? Send us a message and we'll get back to you within one working day. For quick answers, the Shaft Advisor chatbot is available at any time.