Core Size, Build-Up and What Your Hands Are Telling You

Every grip has a core size stamped somewhere on it, usually on the open end. Common values are .580 and .600 inches. That number is the internal diameter of the grip's bore, and it exists so the grip can be matched to the shaft it will go on.

Three Numbers, Not One

Finished grip diameter is determined by:

1. The butt diameter of the shaft, which varies by model and by how much has been cut off the butt end.
2. The core size of the grip, .580 or .600 being the usual choices.
3. The thickness of tape between the two.

Put a .580 core grip on a .600 shaft butt and it stretches, ending up thinner-walled and effectively a size larger in your hands. Put a .600 core grip on a .580 butt and it sits loose, ends up thicker-walled relative to the shaft, and often feels smaller and less connected.

This is why a golfer can buy the exact grip model they liked on a friend's club, install it at home, and find that it does not feel the same at all. The grip was identical. The shaft under it was not.

Where Butt Diameter Comes From

Shafts taper. A parallel-tip shaft trimmed from the butt loses diameter as you cut, so a driver shaft cut two inches shorter has a measurably smaller butt than the same shaft at full length. On a set built with butt trimming, each club can have a slightly different butt diameter.

We measure the butt of every shaft before choosing grips, particularly on re-shafts and shortened clubs. It takes about five seconds with a caliper and it removes the biggest source of inconsistency in grip feel across a set.

The Glove Chart Problem

Most grip sizing advice starts with hand measurements: glove size, or the distance from wrist crease to fingertip. These charts produce a reasonable starting point and they are wrong often enough to be worth questioning.

The reason is that hand size predicts what will fit comfortably, and comfort is not the only criterion. What you are actually fitting is how much the hands should be able to rotate the club. A golfer with large hands who needs to quieten an over-active release may be better served in a size that the chart would call too big for them.

Our practice is to use the chart to pick a starting size, then test one size either side of it with tape build-up before committing to anything. Fifteen minutes at the bench beats a chart every time.

Signs Your Grips Are the Wrong Size

• Too small: excessive wear on the lower-hand pad, a tendency to grip too tightly, and a hook that shows up under pressure.
• Too large: a feeling of disconnection from the head, difficulty releasing the club, and a shot that starts and stays right.
• Inconsistent across the set: one or two clubs that feel like strangers despite being from the same set.
• Worn slick: gripping harder to compensate, which changes forearm tension and therefore changes the swing.

That last one is not about size at all, and it is the single most common grip problem we find. Grips in this climate degrade far faster than the manufacturer's suggested replacement interval assumes. Forty rounds is a realistic life for soft rubber in Southwest Florida summer, not the eighty a national guideline suggests.

Compounds for This Climate

Since we are on the subject, the compound matters as much as the size here.

Soft rubber grips feel wonderful for the first month and turn slick quickly once salt, sweat and humidity get into them. Cord and hybrid compounds hold texture far longer at the cost of some comfort, and for a golfer playing three times a week through a Naples summer they are usually the better economic choice even at a higher unit price.

Seasonal residents have a different problem: grips that sit in a garage in a northern state for five months come back dried out and hardened. If you arrive in December, budget for a regrip during your first week rather than trying to get another season out of them.

The Short Version

Grip size is the product of three measurements, only one of which is printed on the box. Get a caliper involved, test a size either side of the chart recommendation, and replace them more often than you think you need to in this climate.

Written by Talia Nordquist Bench notes · Naples, FL About 5 minutes