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Custom Fitting W-T-F measurement
All human beings share the same skeletal, muscle, tendon, and joint functions and from a mechanical standpoint are the same regardless of height or sex. Non-mechanical differences arise in custom fitting however, for instance: the height of a bicycle seat needs to be greater for a taller person than a shorter person although the mechanical design of the bicycle remains the same. By the same token there is only one true fitting variable in the building of golf clubs and that is club length. Based upon your wrist-to-floor measurement we adjust your club length to correspond to the lie angle of the club-head in order to ensure a proper fitting. The W-T-F measurement should be taken while standing on a hard surface. Wear jogging shoes (not golf shoes) and stand at strict military attention with your shoulders back, feet together, and your arms rigid and straight down at your sides. Measure from the left wrist (the base of the palm), to the floor for a right handed golfer and from the right wrist to the floor for a left handed golfer. Have someone else take this measurement for you to ensure accuracy as you will tend to lean to one side or the other when taking it yourself. Important: Do not round-up the measurement to the next higher inch increment (for instance, if your measurement is 34 and 7/8” do not round up to 35”).
How does the W-T-F measurement work?
It is based upon trigonometry. At the point of ball impact in the downswing your wrist, ground, and club-head form a right triangle. Assuming an ideal swing posture, there is a non-linear mathematical relationship between your W-T-F measurement while standing and wrist-to-ground distance at ball impact. The club-head lie angles are known for the irons and fairway woods as well as the length of one side of the right triangle based upon your mathematically factored wrist-to-ground distance at impact. This gives us the measurement of two angles and the length of one side. We then use trigonometry to solve for the hypotenuse or club length. This is somewhat oversimplified as we factor in shaft deflection and numerous other factors. The fitting formula that we developed produces the ideal golf club length for anyone regardless of height, arm length, etc.
Proper club length
The determination of the ideal golf club length to be used in the 1 Iron Golf System involved a three part analysis:
1. Golf swing mechanics. 2. The determination of a swing plane where muscle, tendon, and joint functions are optimized for power and control. This optimum swing plane would determine the correct lie angle of the club-head and the ideal corresponding club length based on the individual golfer. 3. Interviews with golfers of all skill levels.
After a complete analysis of the first two, the one ideal swing plane and corresponding club-head lie angle for both the irons and woods was determined. Based upon the club-head lie angle the ideal club length for the individual golfer could be factored using their wrist-to-floor measurement.
During the third part of the analysis where the golfers were asked what they considered to be their favorite iron and wood, over 98% of them identified golf clubs which met the specifications of our previously determined ideals.
The correlation between the mechanical/skeletal analysis and the golfers interview analysis proved that our previously determined ideal club-head lie angles and corresponding club lengths for the irons and woods placed the golfers body in a position to maximize power and close enough to the golf ball to ensure consistent solid ball contact. ...click for more fitting info |
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1 Iron Golf, Inc. Corporate Offices Perrysburg, Ohio 419-662-9336 Any information collected by this website is confidential. It is neither shared nor sold. |
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1 Iron Golf®
Custom Fitting Golf Clubs |
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1 Iron Golf Club Lengths * These are approximations only and may vary depending on the brand of golf club used for comparison |
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W-T-F measurement |
Comparable iron club length* |
Comparable fairway wood club length* |
Titanium driver |
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Up to 32.9” |
Gap wedge |
#8 wood |
Approx. 3” shorter than a typical driver |
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33”- 33.9” |
Pitching wedge |
#7 wood |
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34”- 34.9” |
#9 iron |
Approx. 2” shorter than a typical driver |
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35”- 35.9” |
#8 iron |
#6 wood |
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36”- 36.9” |
#7 iron |
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37”- 37.9” |
#6 iron |
#5 wood |
Approx. 1” shorter than a typical driver |
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38”- 38.9” |
#5 iron |
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39”- 39.9” |
#4 iron |
#4 wood |
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40”- 40.9” |
#3 iron |
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