Every iron and wood shaft carries a letter: L, A, R, S, X. Ladies, amateur (or senior), regular, stiff, extra stiff. Most golfers inherited whatever flex came in the clubs and never questioned it. But flex is a fit question, and the wrong one costs you both distance and accuracy.
What flex actually does
During the downswing the shaft bends, then kicks forward at impact. Flex is how much it resists that bend. A shaft matched to your swing speed returns to square at the right moment. Too soft and the head tends to arrive early and open: shots fly high, balloon, and leak left (for a right-hander). Too stiff and the head tends to lag behind: shots go low, feel boardy, and fade right.
The speed question
Flex follows swing speed, not strength or handicap. As a rough starting point for drivers: under 85 mph looks at L or A flex, 85 to 95 is regular, 95 to 105 is stiff, over 105 is extra stiff. If you do not know your speed, carry distance is a loose stand-in: a driver carrying under 200 yards usually points to a softer flex, 250 or more points toward stiff. Treat those numbers as a starting point, not a diagnosis - tempo, launch, and feel all move the answer, and only a measured swing settles it.
Possible signs yours is wrong
- A persistent high slice or low hook with no swing change
- Shots that balloon in the wind and lose distance
- A shaft that feels whippy, or one that feels like a pipe
- You swing smoother than your playing partners but hit it shorter
None of these proves the shaft is the culprit - swings cause the same misses - but they are worth a look. One trap: flex letters are not standardized. One brand's regular can play like another's stiff, which is why a letter alone never settles it.
Changing flex is a reshaft, not a new club
If the flex is wrong but you like the heads, reshafting keeps the club and swaps the engine. At the shop, reshafting labor runs $45 per club plus the shaft itself. One honest note: we do not offer fittings, so if you are guessing at your numbers, getting measured first is worth it. Bring a club by Yorkville Golf at 1668 1st Ave (inside New York Paint & Hardware) or request a quote online.
