The guitar’s neck is the interface of the instrument. It serves as the primary point of interaction between a guitarist and the guitar and there are many aspects involved in the construction of a guitar’s neck that influence this interaction. We’ve already covered some of these including the wood used in the construction of guitar necks, the importance of the neck joint, guitar scale length, and fretboard materials. With this in mind in today’s article, we’re going to take a closer look at an often overlooked yet crucial factor in shaping a guitarist’s playing experience, fretboard radius.
What is Fretboard Radius?
Fretboard radius refers to the curvature of the fretboard, determining how flat or rounded the surface is. It can be measured by taking the radius of a circle that matches the curvature of the fretboard. This measurement is expressed in millimeters (mm) or inches (in) and represents the radius of the circle. (refer to the diagram below)
For some, this seemingly subtle detail can play a significant role in terms of playability with regard to the neck of the guitar (more on this shortly).
Measuring Fretboard Radius
Measuring fretboard radius accurately requires the use of fretboard radius gauges. These gauges are designed to match the curvature of the fretboard, providing a precise measurement. These are relatively inexpensive and come in sets.
Here’s how to measure fretboard radius:
- Select a Reference Point: Choose a reference point on the fretboard where you want to measure the radius. This point is typically near the middle of the neck, around the 9th or 10th fret.
- Position the Gauge: Place the fretboard radius gauge on the selected reference point. Ensure that the gauge rests comfortably against the fretboard without any gaps or lifting.
- Matching the Radius: Using different fretboard gauges, the measurement indicated on the gauge at the point where it aligns with the fretboard curvature is the fretboard radius. For example, the fretboard in the image below is flatter than the 20″ gauge being used, as there are noticeable gaps beneath the gauge.
- Repeat If Required: If you’re working with a guitar that has a compound radius (different radius measurements near the nut and higher up the neck), you may need to measure both points separately for a comprehensive assessment.
How Does Fretboard Radius Affect Playability?
Fretboard radius impacts the playability of a guitar and can influence a player’s comfort, and technique. Below is a breakdown of how fretboard radius affects playability:
- Comfort and Ergonomics:
- The fretboard radius determines the curvature of the fingerboard. A flatter radius, such as 12 inches, feels more like a straight line, while a more rounded radius, like 9.5 inches, creates a subtle curve. The choice between these two extremes, or anywhere in between, greatly influences how comfortable the guitar feels in your hands.
- String Bending and Vibrato:
- A flatter radius provides a more even surface for bends.
- A rounded radius can facilitate smoother and more controlled vibrato techniques.
- Playing Chords:
- A rounder radius can be advantageous for chord playing. The curvature conforms better to the natural shape of your fingers when forming chords, which can lead to cleaner and more comfortable chord transitions.
- Alternatively, some guitarists prefer flatter radii for barre chords, as it can make it easier to press down multiple strings across the fretboard evenly.
- Fretting Hand Comfort:
- The choice of fretboard radius should align with your hand size and playing style. Players with larger hands may find a flatter radius more comfortable, while those with smaller hands might prefer a rounder one.
- Action:
- The curvature of the fretboard can affect the height of the strings from the fretboard (Action). Flatter fretboards tend to have a more consistent string height across the fretboard, allowing for lower action.
- Genre and Playing Style:
- Different fretboard radii are associated with different genres and playing styles. For instance, flatter radii are often favored in rock and metal while rounded radii may be preferred in jazz, due to the nature of the genre with regard to being heavily chord-based.
- Personal Preference:
- Ultimately, the choice of fretboard radius comes down to personal preference. Some players feel more at home with a specific radius that complements their unique style and technique. It’s crucial to try different radii to find the one that suits your playing best.
Compound Radius
A compound radius represents a fretboard that changes in curvature from the nut (the end near the headstock) to the higher frets (closer to the body). This combines the benefits of both a rounded and a flatter fretboard.
For example, near the nut, typically between the first and fifth frets, the radius is more rounded, resembling that of a vintage-style guitar. This curvature is often around 7.25 to 9.5 inches (184-241mm), which is more comfortable for playing open chords.
However, traveling further up the neck, as you progress towards the higher frets the fretboard gradually becomes flatter. This facilitates easier string bending and faster playing.
Final Thoughts
How to Choose the Right Fretboard Radius For You
Selecting the ideal fretboard radius for your guitar can have a fairly major impact on your playing experience. It hinges on various factors, including your preferred playing style and the genres you explore. If you’re more inclined towards playing a more rounded fretboard radius can make it easier to form chords.
Conversely, if you’re more drawn to playing lead, a flatter radius provides better support for bending, vibrato, and fast soloing. Your hand size and comfort matter too; larger hands may find flatter radii comfortable, while smaller hands might prefer a rounded contour. Ultimately, trying out guitars with different fretboard radii, and trusting your gut are essential steps in selecting the right radius to elevate your playing experience.