Enter your speed for a flex + weight recommendation, or use the chart below as a quick reference.
| Club Head Speed | Recommended Flex | Weight Range | Carry (Typical) |
|---|---|---|---|
| 105+ mph | X-Stiff (X) | 65–80 g | 270+ yards |
| 97–104 mph | Stiff (S) | 60–70 g | 240–270 yards |
| 84–96 mph | Regular (R) | 50–65 g | 210–250 yards |
| 72–83 mph | Senior (A) | 45–55 g | 180–215 yards |
| Under 72 mph | Ladies (L) | 40–50 g | Under 195 yards |
Shaft flex controls how much the shaft bends during your downswing. The right flex loads and unloads at the right moment — too stiff and you fight the head delivery, losing distance and control. Too soft and the head whips through inconsistently, kicking the face open or closed depending on tempo.
The most common amateur mistake is playing one flex stiffer than the swing speed suggests — usually because they bought a driver in a shop without measured fitting and assumed "Stiff is what better players use." The wrong-flex penalty is real: measured studies show 8–12 yard average loss vs the correctly-fit flex, plus increased left-right dispersion.
The 95–100 mph range is the Stiff/Regular border, and 102–106 is the Stiff/X-Stiff border. Tempo matters as much as speed in those zones:
Within a flex, weight tunes feel and trajectory. Heavier shafts (within reason for your speed) tighten dispersion at the cost of a few mph; lighter shafts add club-head speed but can feel unstable for stronger players. The weight ranges above represent the sweet spot for each flex — go a few grams either side, but don't jump two categories.
Flex narrows down maybe 30% of shaft selection. The other 70% is the specific shaft model — its launch profile, spin character, kick point, torque, and how the bend profile loads. Two Stiff-flex shafts can produce wildly different ball flights. Our free fitting picks specific shaft models (Ventus, HZRDUS, Diamana, etc.) matched to your tempo and launch needs — flex alone isn't enough.