FITTING TOOLS
Shaft Flex Chart by Swing Speed
Compare golf shaft flex ranges using driver or 7-iron swing speed. Overlapping ranges show when two flex categories deserve a trial; shaft labels and profiles vary across manufacturers.
Enter your measurements to see a practical starting range and what to check next.
Measurements are saved on this device only when you choose Save.
| Label | Driver speed | 7-iron speed |
|---|---|---|
| L | Under 75 | Under 60 |
| A | 70–85 | 55–65 |
| R | 80–95 | 60–75 |
| S | 90–110 | 70–85 |
| X | 105+ | 80+ |
How to use this tool
- Select driver or 7-iron as the speed source and enter a measured speed when available.
- Compare every flex range shown at your speed, including overlaps near a boundary.
- Use contact, flight, tempo and shaft weight to compare actual models during a fitting.
How we calculate
The chart uses overlapping driver or 7-iron speed intervals. Where two intervals overlap, show both options rather than inventing a precise universal cutoff.
Worked example
At 92 mph driver speed, both Regular (80–95) and Stiff (90–110) appear. That overlap is useful: compare timing, contact and flight in actual trials.
| Input or rule | What it means |
|---|---|
| L | Driver below 75 mph |
| A | Driver 70–85 mph |
| R | Driver 80–95 mph |
| S | Driver 90–110 mph |
| X | Driver 105 mph and above |
Limits and common mistakes
Flex letters are not standardized across manufacturers or models. Tempo, shaft weight, bend profile and strike all matter.
Model version: 2026-10-19. Reference: Fujikura fitting reference.
Frequently asked questions
Why do I see two flex options?
The reference intervals deliberately overlap. A boundary is a reason to compare, not a reason to force a single letter.
Can I use 7-iron speed?
Yes. Select the 7-iron source so its own chart applies.
Can distance replace measured speed?
It can provide a wider estimate, but launch and strike affect distance. A monitor measurement is preferable.
Is Stiff the same across brands?
No. Compare actual models and profiles rather than assuming the label defines a universal stiffness.
Will a different flex fix my swing?
It can change feel and delivery, but this chart does not diagnose or correct swing mechanics.