Shaftology

Aftermarket Driver Shaft Lab

0shafts 0makers profile intelligence engine

01 — The Fitting Bench

Dial in your current gamer

Pick what's in your driver right now. We profile it, then comb the database for shafts that match its DNA — so you can shop alternatives with confidence instead of guesswork.

Manufacturer

Model

Weight

Flex

02 — Or, Start With A Goal

No shaft in mind? Dial a flight window

Tell us the ball flight you're chasing and the build you like the feel of. We rank the whole database by how closely each shaft delivers it.

Launch

Spin

Weight

Feel

04 — The Vault

Browse the full database

Methodology

1

Every shaft becomes a fingerprint

Each shaft is reduced to 8 characteristics on a 1–5 scale: launch, spin, tip stiffness, mid stiffness, butt stiffness, balance (counterbalance), feel (smoothness) and stability. That ordered list of 8 numbers is the “DNA” — a point in 8-dimensional fitting space.

2

Distance = how far two fingerprints sit apart

A weighted Euclidean distance — squared per-axis differences, scaled by importance, summed, then square-rooted:

d = √( Σ  wᵢ · (aᵢ − bᵢ)² )

Weight	Axes	Why it's weighted that way
1.0	launch · spin · tip · stability	The outcomes plus the main dispersion/feel drivers a fitter chases first
0.8	balance	Counterbalancing changes how the whole shaft loads
0.7	feel	Matters, but subjective
0.6	mid · butt	Finer structural detail, secondary to the tip

3

Two real-world penalties

A perfect profile in the wrong build isn't a real alternative, so distance grows for weight and flex gaps:

d += (|Δgrams| ÷ 10) × 0.55     ← weight gap
d += 0.4  if your flex isn't offered

4

Distance → a 0–100% score

match% = clamp( 100 · e^(−d ÷ 3),  35,  99 )

Exponential decay: an identical shaft scores ~100%, and the score falls off smoothly with diminishing returns rather than linearly. Capped at 99 (nothing's a literal clone), floored at 35.

5

Rank & surface the trade-offs

Score every other shaft, sort descending, take the top 6. The “Other makers only” toggle keeps true alternatives. Each card's delta pills (▲ softer tip, ▼ lower spin) are literally the axes with the largest gaps — so you see what you'd be trading, not just the number.

The honest caveat

The math is exact and reproducible — but the 1–5 inputs are curated relative estimates for most shafts. Only models with a ✓ Verified specs badge use published manufacturer numbers. And it matches shaft-to-shaft, not player-to-shaft: it knows nothing about your swing speed, tempo or attack angle. Use it to build a shortlist, then get fit by a pro.

Dial in your current gamer

No shaft in mind? Dial a flight window

—

Closest matches by profile DNA Ranked by a weighted distance across 8 shaft traits. Click for the full methodology.

Browse the full database

Closest matches by profile DNA