Step 2 – Bridge & Action Height
In the first installment of our guitar setup series, we started with the neck and took a closer look at the truss rod, neck relief, and why that adjustment forms the foundation of a good setup. Now that the neck is where we want it, we can move on to Step 2: the bridge and string action. This is where the guitar really begins to feel different under your fingers. “Action” refers to the distance between the tops of the frets and the bottoms of the strings. Lower action generally requires less effort to fret notes, while higher action gives the strings more room to vibrate before contacting neighboring frets.There is no single perfect action measurement for every guitarist. Playing style, string gauge, fret condition, fingerboard radius, tuning, and even how hard you pick all influence where that sweet spot ends up. The goal isn't simply to make the strings as low as possible. The goal is to make the guitar comfortable, clean-playing, and responsive for the person playing it. And before we touch the bridge, we need to understand why the truss rod came first.
Why We Adjusted the Truss Rod First
Bridge height and neck relief both affect what we perceive as action, but they do it in different parts of the neck. If a neck has excessive forward bow, the strings can feel unusually high through the middle frets. Lowering the bridge to compensate may make the upper frets buzz before the actual problem has been corrected. Conversely, a neck with too little relief or back-bow may buzz in the lower frets regardless of what we do at the bridge. That is why we establish the neck's relief first. Think of the setup as a sequence: Neck relief establishes the playing surface. The bridge establishes the string height over that playing surface. The nut, which we'll tackle in Part 3, fine-tunes the string height at the beginning of the fingerboard. Each adjustment influences the others, which is exactly why the order matters.
What Makes Good Action?
Too low, and strings may buzz against the frets or bends may choke out. Too high, and the guitar can become unnecessarily difficult to play. You also have to stretch the string farther to reach the fret, which can cause fretted notes to pull sharp. Most manufacturers therefore publish action measurements as starting points, not immutable rules. Fender explicitly notes that its factory specifications can be modified to suit the player's attack and playing style. A player with a light touch may be perfectly happy with very low action. Somebody who digs into the strings with a heavy right hand may need considerably more clearance.
That last part is important: don't set up a guitar entirely with a ruler. Measure it. Adjust it. Then play it. The guitar gets the final vote.
Don't Forget the Fingerboard Radius
Action isn't only about how high the two outside E strings are. The height of the strings across the fingerboard matters too. Most electric-guitar fingerboards aren't flat. Viewed across their width, they form an arc called the fingerboard radius. A smaller radius number describes a more pronounced curve, while a larger number describes a flatter surface. As we raise or lower individual bridge saddles, the strings should generally follow that same curvature. This is especially easy to see on Fender-style bridges with individually height-adjustable saddles. Once the outside strings are at the desired height, an under-string radius gauge can be used to set the four inner strings so the bridge follows the curvature of the fingerboard. That gives each string a more consistent relationship with the frets beneath it. If the string radius and fingerboard radius are dramatically mismatched, one part of the neck may feel great while another feels unnecessarily high, or some strings may buzz or choke sooner than their neighbors.
With that basic idea established, let's look at how action is adjusted on some of the most common electric-guitar bridges.
Fender-Style Stratocaster Vibrato Bridges
We'll start with one of the most recognizable designs of all: the Stratocaster synchronized vibrato. And yes, although everyone calls it a “tremolo,” mechanically it is producing vibrato, changing pitch rather than volume. Pressing the arm reduces string tension and lowers pitch, while pulling upward on a floating bridge increases tension and raises pitch. There are two common versions: Vintage-style six-screw bridges and Modern two-point bridges. Both typically give us individual height adjustment for each saddle, allowing the action and string radius to be dialed in with considerable precision. Fender's setup instructions likewise call for adjusting individual saddle heights after establishing neck relief. But unlike a hardtail bridge, a floating Strat bridge introduces another variable: springs. And this is where setup becomes a balancing act.
String Tension vs. Spring Tension
The strings are constantly pulling the bridge toward the neck. Inside the rear cavity of the guitar, the tremolo springs are pulling it in the opposite direction.
A floating bridge reaches its resting position when those forces reach equilibrium. That means string tension pulls the bridge forward, and spring tension pulls the bridge backward. Tightening the two tremolo-claw screws increases spring tension and pulls the bridge farther toward the body. Loosening the claw screws decreases spring tension, allowing the strings to pull the bridge farther forward. If you're floating the bridge, you'll repeatedly make a small claw adjustment, retune the guitar, inspect the bridge position, and repeat until the guitar is both in tune and the bridge is sitting where you want it. Fender's traditional Strat setup specification uses approximately a 1/8-inch gap at the rear of the bridge as its floating starting point, although that isn't a requirement for every player or every bridge. Some players prefer less travel, and others prefer the bridge resting against the body. If you want the bridge decked, additional spring tension holds the bridge plate against the body. Either approach can work.
The important part is understanding that bridge angle is not independent of tuning. Change the string gauge? Change the tuning? Add or remove a spring? Turn the tremolo claw? You've changed the equation.
Set the Tremolo Before Finalizing the Action
This is an important little trap. If we set the saddle height while the bridge is sitting flat against the body and then float the bridge afterward, the rear of the bridge rises, and the action rises with it. So establish the approximate bridge position first, tune the instrument, then evaluate the final string height. That's one of the reasons floating vibrato setups require a little more back-and-forth than hardtail guitars.
Telecaster Bridges
The Telecaster gives us another variation on individual saddle adjustment. Traditional Tele bridges use three barrel saddles, with each saddle supporting two strings. Modern versions frequently use six individual saddles instead. Fender recognizes both arrangements in its own setup procedure. With a six-saddle Tele bridge, setting action is straightforward: each string can be raised or lowered independently using its saddle-height screws. The vintage three-saddle bridge requires a little more compromise because each barrel controls a pair of strings. We can still raise, lower, and slightly angle each saddle to establish a comfortable string radius, but the two strings sharing that saddle aren't completely independent. That's part of the charm, and occasionally the challenge of the traditional Telecaster design. Regardless of which version you're working with, the same principle applies: Set the outside strings to a comfortable height, then adjust the interior strings so they form an appropriate arc across the fingerboard.
Hardtail Bridges
A hardtail bridge takes the spring-balancing equation completely out of the picture. No vibrato springs. No floating baseplate. No need to balance spring tension against string tension. On the common Fender-style hardtail, each saddle can be adjusted vertically just like the saddles on a Strat bridge. Set the two outside strings to establish your overall action, then bring the remaining saddles into a radius that follows the fingerboard. Because the bridge itself doesn't move, this is one of the easiest bridge styles on which to learn the relationship between saddle height, string action, and fingerboard radius. Tune. Measure. Adjust. Retune. Play. Repeat until it feels right.
Tune-O-Matic Bridges
Now we come to a very different approach. Found on countless Gibson-style guitars, the Tune-O-Matic doesn't usually give us individual saddle-height adjustment. Instead, the bridge sits on two adjustable posts or thumbwheels—one on the bass side and one on the treble side. Raise the bass-side post and all three bass strings come up with it. Raise the treble side and the treble strings come up. The individual saddles primarily handle intonation, while their predetermined heights create the radius across the bridge. StewMac's setup guidance describes Tune-O-Matic action adjustment in exactly this way: the bridge is raised or lowered from either side while its saddle radius remains essentially built into the bridge. This makes action adjustment very simple. Get the neck relief right. Tune the guitar. Measure the bass and treble sides. Raise or lower the bridge until the guitar reaches the desired action. Then play it. One practical note: on some Tune-O-Matic designs, turning the thumbwheels under full string pressure can be difficult. Reducing string tension slightly before making significant adjustments can make the hardware easier to move and avoid unnecessarily fighting against the strings.
Tune-O-Matic vs. Stopbar: They're Not the Same Thing
Here's a distinction worth making. On a typical Les Paul-style setup, the Tune-O-Matic is the bridge. The separate piece behind it is the stopbar tailpiece. The bridge sets the action and intonation. The stopbar anchors the strings and influences the break angle of the strings as they leave the bridge. So if your action is too high, cranking the stopbar farther into the body isn't the solution. You adjust the Tune-O-Matic bridge. There are also guitars with a wraparound bridge, where the strings anchor to the same component that acts as the bridge. These commonly sit on two adjustable studs, so overall action is again controlled by raising or lowering the bass and treble sides of the entire bridge. Some wraparound designs have individually adjustable saddles; vintage-style examples may instead rely on built-in compensation. Different hardware, same basic goal: establish the correct height of the strings over the frets.
Locking Vibrato Bridges: Floyd Rose and Similar Designs
And now for the bridge system that has probably caused more nervous first-time setups than any other: The double-locking vibrato. The Floyd Rose uses a locking nut and locks the strings at the bridge, with fine tuners built into the bridge itself.
Once everything is set correctly, it can provide tremendous pitch range and tuning stability—but there are more interacting variables than on a fixed bridge. The biggest difference for our action discussion is that a traditional Floyd Rose doesn't normally use individual saddle-height screws like a Strat. Instead, the overall action is adjusted by raising or lowering the two bridge pivot posts. Fender likewise specifies that on locking tremolo systems, individual string heights are preset and overall action is adjusted with the pivot screws.
But before evaluating the action, we once again have to balance the bridge.
The Floating Bridge Balancing Act—Turned Up to Eleven
A floating Floyd Rose is an equilibrium system just like a floating Strat bridge. The strings pull one way. The springs pull the other. Floyd Rose recommends that, after tuning, the bridge baseplate sit parallel to the guitar's top. If it leans forward, spring tension needs to increase. If it leans backward, spring tension needs to decrease. The procedure becomes: Tune the strings. Check the bridge. Adjust the claw. Tune again. Check the bridge again. Repeat. And here's the part that confuses newcomers: tuning one string changes the tension on the entire floating bridge, which affec
Floyd Rose recommends positioning those fine tuners near the middle of their adjustment range before beginning the process. Changing string gauge or moving to a significantly different tuning will generally require the spring/string balance to be established again. That's not the Floyd Rose being difficult. That's simply physics doing its thing.
Set It by Measurement—Finish It by Feel
Whether you're working with a Strat, Tele, hardtail, Tune-O-Matic, wraparound, or Floyd Rose, measurements are invaluable because they give us a repeatable starting point. But they aren't the finish line. After setting the bridge, play the guitar the way you actually play it. Strum chords. Play softly. Dig in. Bend the high strings. Play all the way up the neck. Listen for buzzing. Pay attention to whether bends choke out. Notice whether the guitar feels stiff or unnecessarily high. A buzz that appears only when deliberately smashing the string into the fretboard may not matter for a light-handed player. The same setup could be completely unusable for somebody with a heavy attack. A setup isn't about reaching the lowest number on the ruler. It's about finding the point where comfort, sustain, fret clearance, bending, and playing style all meet. And once we've found that point, we're ready to move to the other end of the string.
Next Up: The Nut
At this point, we've established the neck relief and set our bridge height. But there's still one major piece of the action equation left. The nut. The depth of each nut slot determines how high the string sits over the first few frets, which can have an enormous effect on how the guitar feels—and even how accurately notes play in tune near the nut. Too high and first-position chords can feel stiff and pull sharp. Too low and open strings can buzz against the first fret. And unlike turning a saddle screw, cutting a nut slot isn't easily reversible. So we'll save that one for Step 3: The Nut and Nut Slots, where we'll look at how to measure nut action, how the slot should support the string, proper slot angle, and why a few thousandths of an inch can make a surprisingly big difference. For now, get that bridge dialed in. Because when the neck is right, the bridge is balanced, and the action is dialed in, the numbers on the ruler become secondary. What matters is that it feels right.
So measure it. Adjust it. Play it. Make it yours.
Mod your heart out.