How Golf Ball Construction Influences Spin

Golf balls may seem simple from the outside but their internal construction significantly impacts performance. Let’s explore how golf ball design affects both backspin and sidespin in a way that’s easy to understand, even if you’re new to the technical side of golf equipment.

The three key elements: Flight, spin, feel

Golf ball performance can be broken down into three main categories:

Flight is primarily determined by the dimple pattern. All things being equal, shallow dimples generally produce higher flight while deeper dimples (like those on the Titleist AVX) create lower trajectories. When comparing balls with identical dimple patterns, the higher-spinning ball will typically fly slightly higher.

Feel largely comes from compression. Higher compression balls feel firmer, lower compression balls feel softer. Cover material also plays a significant role. Take two balls with similar compression like the Titleist AVX and Titleist Velocity – the urethane-covered AVX will feel noticeably softer than the ionomer-covered Velocity.

Spin is where things get interesting and it’s the focus of our discussion.

Where does spin come from?

At its simplest, spin is primarily created by placing a soft layer over a firmer one. This contrast in materials is what generates spin when the clubface contacts the ball.

Multi-Layer “tour” balls

A typical “tour-level” ball (like Pro V1, Chrome Tour X, or TP5) has:

• A soft urethane cover (the outermost layer)
• One or more firm mantle or casing layers underneath

In three- to five-piece constructions, the casing layer is typically the firmest part of the ball and, generally, internal layers get progressively firmer as you move from core to cover.

This “soft-over-firm” construction is key to generating spin. When you hit the ball, the soft urethane cover gets momentarily pinched against the firmer layer beneath, creating the friction that produces spin.

Two-piece distance balls

Two-piece distance balls typically feature:

• An ionomer cover (firmer than urethane)
• A soft core

This “firm-over-soft” construction produces less spin which is why these balls tend to fly straighter but provide less stopping power on greens.

The spin spectrum: From driver to wedge

One fascinating concept is “spin slope” – how spin rates change throughout your bag.

• Two-piece balls have a relatively flat spin slope. If they spin low off the driver, they’ll also spin low with irons and wedges.
• Multi-layer balls can have a steeper spin slope. They might spin low with the driver for distance, moderate with irons for control and high with wedges for stopping power.

The more layers a golf ball has, the greater the manufacturer’s ability to tune the spin slope. While TaylorMade seldom bills it as such, the biggest advantage of the TP5 is the enhanced ability it offers to tune the spin slope.

Other manufacturers use graduated core designs to extend their spin slopes. Loosely, this approach is similar to a chocolate lava cake where the innermost portion of a solid core is softer than the outer portion. Much like adding additional layers, the steeper the gradient (the greater the hardness difference between the softest inner portion and firmer outer portion of core), the more spin will be generated.

All of this is to explain why, almost invariably, firmer “tour” balls provide more spin than two-piece and even lower-compression three-piece offerings.

In robot testing, the difference between the highest- and lowest-spinning balls off a driver was about 600 rpm. However, on a 35-yard shot, that difference ballooned to 2,500 despite much lower impact speed.

What about side spin and accuracy?

The common marketing claim that “softer balls fly straighter” has some truth but it’s more complex than it sounds.

Ball flight straightness depends on two factors:

1. Spin rate (how much the ball spins)
2. Spin axis tilt (how tilted the spinning axis is at impact)

Lower-compression balls do tend to produce less spin which can reduce curvature but this advantage is often minimal in real-world conditions.

The test case

To quantify exactly how the spin properties of golf balls influence curvature, we ran simulations using data from our 2023 ball test and FlightScope’s trajectory optimizer tool.

For the test, we compared a higher-compression tour ball against a lower-compression ball with these parameters/assumptions:

• The softer ball will produce less ball speed
• The softer ball will launch slightly higher
• The softer ball will spin approximately 300 rpm less

Here are the results.

With a modest five-degree axis tilt:

• The softer ball carried 3.5 yards shorter
• The softer ball landed only 0.3 yards (about one foot) closer to the center line

Increasing to a 10-degree axis tilt:

• The softer ball carried nearly four yards shorter
• The softer ball landed 0.6 yards (about two feet) closer to center

Even when adding in an initial pulled start direction, the results were similar: about three yards less distance with less than one yard of improved accuracy.

Only when the axis tilt was effectively halved did we see the distance gap close while showing a meaningful (four yards) accuracy advantage.

Also of note, if we were to narrow the speed advantage of the firmer ball in our test case, accuracy differences would narrow as well. To an extent, part of the accuracy advantage of low-spin balls is a result of their speed disadvantage.

By the letter, claims that softer, two-piece balls fly straighter are accurate but the reality is that those straightness benefits are minimal and are often accompanied by a loss of distance.

The quality factor

There’s one more crucial element to consider: manufacturing consistency. Softer materials are simply harder to work with during the manufacturing process which can lead to inconsistent layer thickness.

A ball with uneven layers can fly unpredictably, potentially negating any accuracy advantage. In robot testing, we’ve seen perfectly struck balls land more than 30 yards off-target due to construction inconsistencies.

The bottom line

• Multi-layer urethane balls spin more than two-piece ionomer balls.
• The greater the difference between the soft and hard layers, the more spin potential.
• Tour-level balls can offer both distance (low driver spin) and control (high wedge spin).
• The straightness advantage of lower-spinning balls is generally modest.
• Quality and consistency should not be overlooked in the straightness equation.

Understanding these principles can help you select the right ball for your game based on what you value most: maximum distance, control around the greens or finding the right balance for your personal preferences.