After analyzing 1,440 swings, we discovered that 9 out of 10 golfers play the wrong-sized grips, and that finding a perfect match can make you longer and more accurate—without having to change your swing.
The Conventional Wisdom: Unless your hands are unusually big or small, you can get away with playing standard-size grips. You can also use a static fitting chart like the one below to match grip size to your hand size.
Our New Theory: Finding the correct grip size has little to do with the size of your hands, or even personal preference. It has everything to do with the dynamics of your swing.
How We Tested It: Twenty-four golfers (ranging in handicap from 1 to 7) hit their own 5-iron and five identical 5-irons (Titleist AP2s with Dynamic Gold S shafts), each with a different-sized Golf Pride grip (undersized, standard, slightly larger standard, midsized and jumbo). All markings were covered to prevent any previous size bias. While blindfolded, each golfer was asked to choose the grip they preferred simply by holding each club in their hands. They were then measured for grip size using a fitting chart.
After sufficiently warming up with their own 5-iron, each golfer hit two practice shots out to a target on the range, then hit 10 additional shots that were measured on a Trackman launch monitor. This was repeated for each club (assigned in random order), concluding with their own 5-iron, which served as a control club.
1. Hand Measurements Don't Work
-- 16 of the 24 blindfolded golfers (67%) preferred a grip size that was different than their measured grip size in the pre-test.
-- After hitting shots, 22 of the 24 players (92%) preferred a grip size that was different than their measured grip size.
CONCLUSION: Determining grip size through standard static fitting procedures isn't a very good predictor of the grip size that golfers prefer.
2. Neither Does Relying on Your Feel Sense
-- 21 of the 24 golfers (88%) had standard-sized grips on their own 5-irons, yet less than half of these players (10 of 21) were measured for standard-sized grips.
-- Only slightly more than half (11 of 21) preferred the standard-size grips on their 5-iron after hitting test shots with the other 5 test clubs.
CONCLUSION: If you're playing off-the-rack clubs with standard-sized grips, there's only a 50% chance that these grips match what you'd be measured for in a static fitting, or what you'd actually prefer.
3. You're Playing the Wrong Grips!
-- Only 5 of 24 golfers (21%) hit their best shots with the grip size that matched their measured grip size in terms of left/right accuracy. These weren't always the grip size the golfers preferred, either.
-- Only 3 of these golfers (13% total) hit the best shots with the grip size that matched their measured grip size in terms of distance control.
-- Only 1 golfer (4%) hit the ball straighter and with greater distance control with the grip size that matched their measured grip size.
CONCLUSION: Your grips are costing you at least 5 strokes per round.
How to Use These Findings: The only way to know what size grips to use is to experiment with as many different sizes as possible. When you decide to make the change, ask the professional who's fitting you the following questions. The answers will go a long way toward making sure the job gets done right.
1. What size grips are currently on my set?
Part of a good trial is comparing your performance with new grips against what you brought to the fitting.
2. Can I hit the same club outfitted with different-size grips?
That's how we performed the test, and it's the only way to accurately test your performance with each size. Make sure swingweights are consistent — larger grips will tend to make the clubhead feel too light.
3. Can I measure my swings with each grip on a launch monitor?
It's hard to gauge your results if you're hitting into a net, so make sure the shop has a launch monitor or other shot-tracking device. It's important to base your decision solely on shot data.
Remember—the right size grips won't leave a mark.
You shouldn't see much wear and tear at all—even after a few rounds and practice sessions—because glove breakdown is a result of the grip moving around in your hands, which you get when your hold is incorrect or your grip is the wrong size.
If you tend to wear down the part of the glove covering the base of your thumb or anywhere in your palm then you're not holding the handle in your fingers. If you're wearing down your glove where you hold the handle in your fingers, it's a sign that your grip is too small. The same goes for your right hand. You shouldn't see any black marks or even blisters if you've nailed your grip and grip size.