The Unfortunate 90%


Chances are better than 9-in-10 the clubs you are using now are the wrong size and fit making golf more difficult than it should be for you.

If you can’t consistently hit the ball solid and have it go where you aim, it isn’t your fault. It’s due to poorly-fit clubs either bought off-the-shelf or fitted to a swing.

To play your best your clubs must fit.
In fitting, getting the right shaft length & lie angle “size” is foremost.

Each of us has an optimal golf club fit – one that best facilitates our own biomechanically efficient motion for an athletic, balanced, and powerful swing from address to impact to follow-through.

The solution for getting your optimal fit lies in accurately identifying two key factors that are unique for each player and based on the body, not a swing.

The two key factors are:

Height of the golf club off the ground. This is the distance from the ground to the top of the grip.

Ball spacing. The distance from the ball to where the hands hang vertically at address.

Perfect fit at address.

Perfect fit at impact.

Optimal Fit With JDFS Algorithm

The perfect club fit is solved by identifying the height of the golf club off of the ground and ball spacing and then crafting the club length and lie angle to put you in this exact optimal position.

Based on your unique body dimensions (height, arm length, leg length, waist size, hand size, weight), not your height or your swing, our patented fitting algorithm calculates the optimal club “size” – shaft length and lie angle for each club in your set.

This is a math-based, objective fitting approach developed over 20+ years by Jeffmont company founder, Jay Turner, from data on more than 50,000 fits.

Note that two people the same height can require a different size while two people with different heights can require the same size. Getting the right golf club size isn't about tall, short or average stature. It’s 100% about matching to each player’s unique body dimensions.



A Revolutionary Fitting Solution – the Jeffmont Dimensional Fitting System (JDFS) Algorithm

JDFS Algorithm determines optimal proportional static & dynamic fit at address position.

JDFS Algorithm determines optimal proportional static & dynamic fit at address position.

The JDFS algorithm first calculates proportional body change (from standing to address), which provides the solution for your ideal address position.

It then factors your address dimensions to accommodate for the changes to your body and golf club caused by downswing forces. JDFS provides the optimal static and dynamic fit from the start to finish in your swing.

Our "dimensional sizing scale" includes 23 different basic sizes. Each size represents a specific combination of shaft length and club lie angle. With our sizing scale we’re able to accurately fit male and female golfers, juniors to adults, from 4’0” to 7’0” tall.



Clubs fitted to your size with our algorithm will lead you to play with the proper amount of spine tilt and knee flex, which facilitates biomechanically sound rotational efficiency and balance throughout your swing.

No compensating motions or positions are forced because your clubs fit your body properly.

On the other hand, clubs that don’t fit force un-athletic swing motions and inefficiencies that can also result in back problems and other joint related stress issues.

Our fitting algorithm is not based on your swing, which may already be negatively influenced by your poorly- or un-fitted clubs. It’s based on objectively measurable criteria, namely your body's dimensions. It facilitates both swing improvement and optimal performance.


Clubs not fit to the body.


Clubs fit to the body with the JDFS Algorithm.


JDFS fittings can be done from anywhere in the world through our website or mobile app, or in-person by using our physical kiosk. Get our complimentary fitting recommendation that includes your ideal shaft length, lie angle, and grip size for your driver and 6-iron.



The problem with off-the-shelf clubs.

The "one size fits all" approach used by major club manufacturers produces results like the playing positions shown above in the graphic "Clubs not fit with JDFS Algorithm." Although off-the-shelf clubs are mass-produced to a specification intended for the “average person,” manufacturers somehow expect them to work for everyone.

In fact, based on experience, less than 10% of off-the-shelf clubs properly fit their user. This is the reason so many otherwise athletic or well-coordinated individuals have such a tough time playing golf well – their clubs simply aren’t the right size for them.



The problems with fitting to a swing.

If you have actually been fit before, you’ve likely been fit to your swing. If this is the case, you’ll have difficulty to improve your swing using these “fitted” clubs.

Here’s why. In swing based fitting, flaws are a part of the fit. A fitter isn’t there to change your swing. He’ll base the fit on the swing you bring.

From the variety of swings you make, your fitter will make the decision to fit (adjust) your clubs to your tendency with the goal of counteracting the particular swing fault(s).

One common swing flaw exhibited by many golfers is the steep, out-to-in swing path that results in balls being hit off the toe of the club.

If the fitter uses a lie board for analysis, the solution would be to center contact of the club sole with the ground by adjusting shaft length and/or lie angle. On toe contact hits, the fitter’s conclusion would normally be that your club is too flat so it should be made longer and/or more upright.

If face impact tape was used and showed toe hits, the cure would likely be the same; make your club longer.

In both examples, the swing flaw is “fixed” by making a club that’s essentially now too big. Keep in mind that the fit will only function “properly” when the same swing flaw(s) is present. In other words, this fitting adjustment serves to reinforce the fault. When you make a better swing that doesn’t have your usual flaw the ball won’t react as it normally would.


Swing-based vs. JDFS fitting comparison


Swing-Based Fitting Methods

  • Expensive
  • Must be completed in person
  • Trial-and-error based, subjective results
  • With inconsistency in swing motion, which swing do you choose to fit?
  • Flaws in the swing factor into the fit so the fit only functions "properly" when the swing flaws are present
  • How do you fit a brand new golfer?

JDFS Fitting Method

  • Affordable
  • Quick and accurate
  • Anyone, anywhere can be fitted perfectly
  • Based on body dimensions, not swing motion
  • Results are math-based/objective
  • Facilitates sustainable improvement
  • New golfers can be fitted perfectly