Stiff, Regular or Extra Stiff Golf Shafts?

Why Your Swing Speed Doesn't Tell the Whole Story

Few words in golf equipment create as much confusion as "regular," "stiff" and "extra stiff." Golfers are constantly told that their swing speed determines which flex they should use, and the advice sounds simple enough. Swing 85 mph and you need regular, swing 100 mph and you need stiff, swing 110 mph and you need extra stiff. But golf equipment isn't nearly that simple, and choosing a shaft based on swing speed alone can leave you with a club that doesn't perform the way you expected.

Shaft flex matters, but it is only one part of the equation. Shaft weight, length, torque, bend profile, transition, tempo, release pattern and the way you deliver the club all influence how a shaft performs for an individual golfer. Two golfers with exactly the same driver swing speed can perform better with completely different shafts. In fact, even two golfers with similar handicaps and similar distances can have dramatically different shaft requirements.

The problem is that golfers often buy the label instead of evaluating the shaft.

What Does "Stiff" Actually Mean?

The first thing to understand is that shaft flex isn't a universal standard.

One manufacturer's stiff shaft can feel and perform differently from another manufacturer's stiff shaft. The letter on the shaft doesn't tell you everything about how that particular shaft behaves. A stiff shaft in one model can have a different weight, profile and feel from a stiff shaft in another.

This is one reason golfers sometimes switch from one brand to another and suddenly feel like their new "stiff" shaft is completely different. They aren't imagining it. The flex designation is only one characteristic of the shaft.

Think of "stiff" as a category, not a precise measurement.

The label doesn't tell the whole story.

Swing Speed Still Matters

None of this means you should ignore swing speed.

Clubhead speed is an important variable when selecting equipment because it provides an indication of the forces being applied to the shaft and the potential energy being transferred into the ball. Faster swings can place greater demands on a shaft, and slower swings can benefit from equipment that makes it easier to generate speed and launch the ball.

But swing speed doesn't tell us how you create that speed.

A golfer with a smooth, gradual transition may load the shaft very differently from a golfer with an aggressive change of direction. Two golfers can reach the same maximum clubhead speed while putting very different demands on the shaft.

That's why swing speed is best viewed as a starting point, not a final answer.

Your Transition May Matter More Than Your Speed

Imagine two golfers who both swing their drivers at 100 mph.

Golfer A has a smooth takeaway and gradual transition. The club accelerates progressively into impact, and the golfer has a relatively consistent delivery. Golfer B has a short, aggressive transition and creates a significant amount of force early in the downswing.

They have the same clubhead speed.

But they don't necessarily need the same shaft.

The way the golfer loads and unloads the shaft can influence how different shaft characteristics feel and perform. One golfer may prefer a particular bend profile while another may find the same shaft difficult to control.

This is one of the biggest reasons a simple swing-speed chart can be misleading.

Speed tells you how fast. Transition helps tell you how.

Shaft Weight Is Often Overlooked

Golfers tend to talk about flex constantly and weight surprisingly little.

That's a mistake.

A shaft that is significantly heavier or lighter can change how the club feels throughout the swing. It can influence tempo, timing and how consistently you deliver the club to the ball. For some golfers, moving to a lighter shaft can make it easier to generate speed. For others, additional weight can provide a sense of stability and help create a more repeatable delivery.

There isn't a universal answer.

A lighter shaft isn't automatically better for slower swingers, and a heavier shaft isn't automatically better for faster swingers. The right weight depends on the golfer and the outcome you're trying to achieve.

Sometimes changing shaft weight can produce a bigger practical improvement than changing flex.

What Happens If Your Shaft Is Too Stiff?

Golfers are often afraid of using a shaft that is too flexible, but the opposite problem can also occur.

If a shaft doesn't work well with the way you load and deliver the club, you may struggle with timing and consistency. The club can feel difficult to load, and you may unconsciously compensate with your swing.

That doesn't mean every golfer should use a softer shaft.

A shaft that is too soft for a particular golfer can also create inconsistent launch and directional results. The important question is whether the shaft allows you to make a repeatable swing and deliver the club efficiently.

The objective isn't to find the softest shaft you can play.

It's to find the shaft that works with the way you swing.

What Happens If Your Shaft Is Too Flexible?

This is the problem most golfers are familiar with.

If the shaft doesn't provide the characteristics a golfer needs, the club can feel unstable or difficult to control. The golfer may see inconsistent launch, spin or direction and assume the solution is simply to move into a stiffer flex.

But that can be an oversimplification.

If the problem is actually shaft weight or bend profile, moving from regular to stiff may not solve anything. You could simply be changing one variable while leaving the real problem untouched.

This is why fitting needs to look at the entire shaft rather than one word printed on it.

Torque Isn't the Same as Flex

Another commonly misunderstood specification is torque.

Torque describes a shaft's resistance to twisting, generally expressed in degrees. It is not the same thing as flex, although the characteristics can interact to influence how a shaft feels and performs.

Golfers sometimes hear that low torque is automatically better because it sounds more stable. But again, there is no universal rule.

Different golfers can respond differently to different torque characteristics. Feel, stability and launch behavior all have to be considered together.

This is another example of why choosing equipment based on a single specification rarely tells the whole story.

Shaft Length Matters Too

Shaft length is particularly important in the driver.

A longer shaft can potentially increase clubhead speed, but it can also make it more difficult to consistently strike the center of the face. If a golfer gains a couple of miles per hour but loses center contact, the theoretical speed advantage may disappear.

A slightly shorter driver can sometimes produce better overall performance because the golfer has greater control and more consistent contact.

This is a perfect example of the difference between maximum performance and average performance.

Golf is played with the latter.

The Shaft Changes How You Deliver the Club

This is where shaft fitting becomes particularly interesting.

Equipment isn't simply reacting to your swing. The equipment can influence your swing as well.

A club that feels comfortable and controllable can allow you to swing more naturally. A club that feels too heavy, too light, too stiff or unstable may cause you to change your timing or delivery without consciously realizing it.

That means equipment and technique are interconnected.

The right shaft isn't necessarily the one that produces the best launch-monitor number on one swing. It is the one that helps you produce a repeatable delivery over a series of swings.

Your Dispersion Can Reveal More Than Your Distance

When golfers test shafts, they often focus on carry distance.

That's understandable, but it can be a mistake.

Suppose Shaft A gives you 275 yards of carry on average and Shaft B gives you 272 yards. It would be easy to declare Shaft A the winner.

But what if Shaft A produces a 35-yard dispersion pattern while Shaft B produces a 20-yard dispersion pattern?

The three-yard difference in carry may be irrelevant compared with the improvement in accuracy.

This is why good fitting looks at multiple performance variables rather than chasing one number.

Distance matters. But predictable distance matters more.

Your Miss Can Help Choose Your Shaft

One of the most useful pieces of information in a fitting is the golfer's typical miss.

Do you miss left?

Do you miss right?

Do you tend to hit low?

Do you produce too much spin?

Do you launch the ball too high?

Do you strike the heel or toe?

These patterns help create a picture of how you interact with the club. A shaft isn't going to magically eliminate a swing flaw, but equipment can potentially be selected to complement your tendencies rather than making them more difficult to manage.

The objective isn't to disguise your swing.

It's to create an equipment setup that gives your swing the best opportunity to perform.

Why Tour Shaft Choices Can Be Misleading

Another common mistake is looking at what professional golfers use and assuming you should use something similar.

Tour professionals are outliers.

They generate extraordinary speed, control their impact conditions with remarkable consistency and have access to sophisticated fitting and testing resources. Their shaft selection is based on extremely detailed analysis of their individual delivery.

The fact that a professional uses an extra-stiff, 70-gram shaft doesn't mean that a recreational golfer who wants to "play better" should use one.

In fact, copying a Tour player's equipment can sometimes make your own golf worse.

Fit yourself, not your favourite professional.

The Right Shaft Can Change More Than Your Ball Flight

When golfers think about shafts, they usually think about trajectory.

But the effects can extend beyond launch and spin. Shaft weight and profile can influence feel, timing, contact and confidence. If a golfer feels more comfortable with a particular shaft, that can affect how freely and consistently they swing.

This is why subjective feedback still matters in a fitting.

Launch-monitor data tells you what the ball is doing.

The golfer tells you what the club feels like.

The best fitting uses both.

This Is Where AI Can Become Particularly Useful

Traditional shaft fitting can be extremely effective, especially when an experienced fitter has access to quality launch-monitor data and multiple shaft options. But there is a huge amount of information that can potentially be considered when making a recommendation.

That's where AI has an interesting role.

Instead of simply asking how fast you swing, an AI-powered fitting process can consider your physical profile, current equipment, swing characteristics, performance results and goals together. It can look for relationships between variables that are difficult to capture with a simple chart.

For example, two golfers may both swing 100 mph, but their physical characteristics, transition, strike pattern and launch conditions may point toward completely different equipment.

AI can help move the question from:

"What flex do I need?"

to:

"What shaft characteristics are most likely to help my particular swing?"

That's a much better question.

You Don't Need to Know Your Shaft Specification

Here's another important point.

You don't need to become an equipment engineer to get properly fitted.

You don't need to understand every shaft profile. You don't need to memorize torque specifications. You don't need to know the difference between every bend profile on the market.

That's what fitting technology is supposed to help with.

Your job is to provide accurate information about your game and understand the performance you're trying to improve. The fitting process should then help translate that information into equipment recommendations.

Your Shaft Should Be About Your Game

There is no magic shaft.

There is no universal "best" flex.

There is no rule that says every golfer with a certain swing speed needs the same weight.

And there is certainly no reason to choose a shaft simply because a Tour player uses it.

The best shaft is the one that helps you produce the combination of speed, launch, spin, contact and dispersion that makes sense for your game.

Sometimes that will be regular.

Sometimes stiff.

Sometimes extra stiff.

And sometimes the answer may be a shaft that you would never have considered based on your swing speed alone.

Stop Choosing the Letter. Find the Fit.

Golf equipment has become too sophisticated for simple rules to tell the whole story.

Your swing speed matters. Your transition matters. Your tempo matters. Your strike matters. Your physical characteristics matter. Your current equipment matters. And the shots you're trying to hit matter.

Put all of those factors together and you get something far more useful than a flex designation.

You get a personal equipment profile.

That's the idea behind golfgaim. Its AI-powered fitting process looks at the golfer rather than simply applying a generic swing-speed chart. By analyzing physical, equipment and performance information, golfgaim can help identify the equipment characteristics that make sense for your individual game.

So the next time someone asks whether you should use regular, stiff or extra stiff, don't assume the answer is hiding in your swing speed.

It might be.

But there's a good chance there's a lot more to the answer.

Don't choose your shaft by the letter. Choose it by the golfer.