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Golf shaft flex: which one do you need?
The letter on the shaft is a measurement of how much it bends, and the right one depends on how fast you swing and how you swing. Put in your driver speed, or your 7-iron carry if that is what you know, and Morris gives you the band and what it means.
By Morris, by Badgie Golf · Updated
Shaft flex
Regular (R)
- L< 72
- A72–83
- R84–96
- S97–104
- X105+
A starting point, not a fitting: weight, torque and tip stiffness change how a shaft plays, and labels differ between makers. Tempo matters: a quick transition plays a flex softer.
The chart
| Flex | Driver club speed |
|---|---|
| Ladies (L) | under 72 mph |
| Senior (A) (A) | 72–83 mph |
| Regular (R) | 84–96 mph |
| Stiff (S) | 97–104 mph |
| Extra stiff (X) | 105 mph and up |
Symptoms of the wrong flex
| You see | Likely |
|---|---|
| Low, right, feels dead, short carry | Too stiff or too heavy |
| High, left, ballooning in wind, inconsistent on hard swings | Too soft |
| Driver fine, irons low | Iron shafts too heavy or too stiff (steel) for your speed |
| Good on the range, left on the course when you swing hard | Fast tempo playing a soft shaft: go one flex up or heavier |
What the letter does not say
- 1
Weight
40 to 80 grams in drivers, 60 to 130 in irons. Lighter swings faster and launches higher; heavier is more stable. Choose weight for strength and tempo, then flex.
- 2
Torque and tip
Torque is how much the shaft twists; a low-torque shaft feels firmer and holds the face for strong players. The tip section decides launch: a soft tip launches higher.
- 3
Tempo
Two golfers at 95 mph can need different flexes: the smooth one plays regular, the one with a quick transition loads the shaft more and plays stiff.
- 4
Brand
No standard. A stiff from one maker can measure like another's regular. Compare within a brand, or by frequency, or in ten balls on a launch monitor.
Where to find your speed
Any launch monitor at a shop or a range, a GPS watch that measures club speed, or the estimate from your 7-iron carry in the finder. The distance chart goes the other way: from your speed to every club. And if the ball goes right and low with a flex that should fit, the cause is the swing, not the shaft: the swing analyzer finds it on video.
Sources
- GOLF.com — Here's the shaft flex you should play based on your swing speed (data from True Spec Golf) — The five bands by driver speed used by the finder. 12 June 2020; read 9 October 2026.
- MyGolfSpy — Golf driver shaft flex chart: find the right flex for your swing speed — Why flex is one variable among weight, torque, tip stiffness and kick point, and why a fitting confirms the chart. Read 9 October 2026.
Shaft questions
What flex shaft do I need?
By driver club speed: ladies (L) under 72 mph, senior (A) 72 to 83, regular (R) 84 to 96, stiff (S) 97 to 104, extra stiff (X) from 105. Most club golfers are regular. Tempo shifts it: a fast, aggressive transition plays a flex softer, so a 95 mph swinger with a quick move may prefer stiff.
What happens if my shaft is too stiff?
The ball flies lower and to the right (for a right-hander), feels like a board and loses carry: the shaft does not load and the face arrives open. Too soft is the opposite: high, left, and inconsistent on hard swings.
Is shaft flex the same across brands?
No. There is no industry standard: one maker's stiff can measure like another's regular. Within a brand the letters are consistent; across brands compare frequency (cpm) or ask the fitter. That is why the chart is a starting point.
Does shaft weight matter more than flex?
Often, yes. A 50-gram and a 70-gram shaft of the same flex play very differently: lighter is easier to swing fast and launches higher, heavier is more stable for strong players. Pick weight for your speed and strength, then flex.
Should my irons have the same flex as my driver?
Usually, but not always: iron shafts are heavier and steel, and some golfers who need stiff in the driver play regular in the irons for height. The 7-iron on a launch monitor settles it in ten balls.
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