Golf Glossary
Spin Axis (Sidespin)
In short
Spin axis is the tilt of the ball's rotation axis relative to the horizontal, measured right after the shot. At zero degrees the ball spins backwards only and flies without curve. For right-handers negative values mean a curve to the left and positive values a curve to the right. The sideways part of the spin is called sidespin.
What is spin axis in golf?
Spin axis describes the axis around which the ball rotates after the shot. More precisely, it is the tilt angle of this imaginary rotation axis relative to the horizontal, measured right after the ball leaves the clubface. A spin axis of zero degrees means the ball spins around a horizontal axis with pure backspin, so it flies without curve.
The more the axis is tilted sideways, the more the ball curves. For right-handers a negative value means a curve to the left, a draw or hook, and a positive value means a curve to the right, a fade or slice. People often talk about sidespin as well. That is the sideways part of the spin that produces this tilt.
Spin axis, sidespin and backspin: how they relate
The total spin of the ball can be split into two parts: backspin, which makes the ball climb, and sidespin, which bends it sideways. Together they give the total spin that launch monitors report as spin rate. The spin axis is the angle that describes the ratio of the two: the larger the sidespin compared with the backspin, the larger the angle.
A worked example: a driver shot has a total spin of 2,600 rpm and a spin axis of plus 8 degrees. That gives a sidespin of about 360 rpm and a backspin of about 2,575 rpm. Backspin hardly changes, yet those 360 rpm of sidespin are enough to send the ball visibly to the right.
This is one reason why monitors give the spin axis in degrees. The angle can be compared across clubs, while the same number of sidespin revolutions can mean something quite different depending on the backspin.
Reading spin axis: straight, draw or fade
TrackMan treats values between minus 2 and plus 2 degrees as straight shots with hardly any visible curve. Beyond that the curve starts. TrackMan gives rules of thumb: at about 150 yards, a spin axis of minus 2 degrees produces roughly 2 yards of curve to the left, and minus 10 degrees roughly 11 yards. At 200 yards these figures grow to about 3 and 15 yards.
The axis hardly changes in flight. It is set at impact. Wind can change the trajectory and therefore the visible curve, but it does not change the tilt of the rotation axis itself.
In practice this means: if you want to play a fade you need a small positive value, and for a draw a small negative one. If you hit values of plus 10 degrees or more without intending to, the ball is heading for a slice. Then look for the cause in the swing, not in the curve itself.
How is spin axis created?
Two things decide the spin axis: the relationship between clubface and swing path, and where the ball meets the clubface. The first is called face to path, the difference between face angle and club path. If the face points right of the path, sidespin appears and bends the ball to the right. If it points left, the ball bends to the left.
The second is the strike location. If the ball meets the face not in the middle but nearer the toe or the heel, the shifted centre of gravity of the clubhead adds extra sidespin. TrackMan points out that if face to path is positive but spin axis is negative, the player has hit the ball towards the toe.
The club matters too. With the same face to path, a club with little spin loft such as the driver tends to produce a larger spin axis than a wedge. That is why a wedge forgives direction errors more easily, whereas the driver makes them visibly bigger.
Practical example: spotting a slice and a draw
A player hits ten drives and reads the spin axis on a launch monitor each time. The values lie between plus 9 and plus 14 degrees. That is a clear slice spin. At a carry of about 200 yards, a value of plus 12 degrees means roughly 18 yards of curve to the right by the TrackMan rules of thumb.
Now he looks at club path and face to path. The club path is minus 5 degrees and the face is plus 2 degrees. Face to path is plus 7 degrees. The cause is clear: the clubhead travels from out to in, and the face is open to the path.
After a few weeks of practice with a slimmer downswing and a slightly stronger grip, the values are plus 3 to plus 5 degrees. The ball starts further left and only curves back slightly. That is a controllable fade. The spin axis shows the effect of the work, but the cause lies in the path and the face.
Common mistakes and tips
The most common mistake is to look only at the curve and miss its cause. Spin axis is a result, not a swing fault. Treat it as a pointer and look for the cause in face to path, club path or strike location. If you merely try to pull the ball left on purpose, you cover up the curve but do not solve the problem.
A second mistake is to draw conclusions from a single shot. One outlier from a toe strike distorts the picture. Hit several shots with the same club and look at the average and the spread.
As a tip, the spin axis does not depend on your alignment, but the start direction of the ball does. Lay an alignment stick along the target line to separate the two. Try a lower tempo and see whether the axis gets smaller. If so, the cause is often too much hurry in the downswing. If not, a lesson with a PGA pro who reads path and face together helps.
Spin axis compared with spin rate and dispersion
Spin axis describes the direction of the rotation axis, spin rate describes how fast the ball spins. They belong together but are separate measures. A high spin rate with a spin axis of zero means a lot of backspin without curve. The same amount of sidespin gives a larger angle with little backspin than with a lot of backspin.
Dispersion describes how far your shots are spread overall. It comes from the start direction and curve of all shots. The spin axis only explains the part of dispersion that comes from curve. The other part comes from the start direction.
The word curve on TrackMan is not the same as spin axis either. It measures the sideways movement of the ball in flight in metres or yards, while the spin axis gives the angle of the rotation axis that triggers this movement.
Try it at Golf Lounge
The TrackMan simulators at Golf Lounge Resort Hamburg are indoors. You hit real balls into the screen and the software converts the ball flight to the course you choose, all year round and whatever the weather. The measurements include ball speed, launch angle, spin, carry and dispersion. That shows how your shots spread from shot to shot. Up to four people can play together. If you want to understand the cause of a curve, you can go through the data in a one-to-one lesson with a PGA pro.
Frequently asked questions
What is spin axis in golf?
Spin axis is the tilt of the ball's rotation axis relative to the horizontal, measured right after the shot. At zero degrees the ball spins with pure backspin and flies without curve. Negative values mean a curve to the left for right-handers and positive values a curve to the right. TrackMan counts values from minus 2 to plus 2 degrees as straight.
What is sidespin in golf?
Sidespin is the sideways part of the ball's spin. It appears when the clubface does not match the swing path or when the ball is not struck in the centre. The larger the sidespin compared with the backspin, the larger the spin axis and the more the ball curves. A slice has a lot of sidespin.
What is a good spin axis?
For a straight shot, values between minus 2 and plus 2 degrees apply. If you play a deliberate shot shape, you want a small, constant value in the direction you intend. What matters is that it is repeatable. Large values of ten degrees or more mean clear curve, for example a slice or hook.
How much curve does a spin axis of 10 degrees give?
By TrackMan rules of thumb, a spin axis of 10 degrees produces about 11 yards of curve at roughly 150 yards, and about 15 yards at roughly 200 yards. It is an approximation for centred strikes without strong wind. The longer the flight, the bigger the curve.
How do I change my spin axis?
You change it through face to path, the difference between clubface and club path, and through where the ball meets the face. Check your grip, alignment and downswing. Measure several shots with a launch monitor to see the effect. A PGA pro can find the cause in your swing.
As of: October 2026