Guitar Tremolo Route: Standard Cavity Sizes

What is a tremolo route?

A tremolo route is the cavity carved into a solid body to house the tremolo block and the spring claw. The factory cuts this cavity when the guitar is built, and its size and depth decide which bridges can be installed later. A route that is too shallow will not clear a longer sustain block, and a route that is too narrow will not fit a wider base plate. When you compare guitars, the route type tells you a lot about what the instrument was designed to do.

The route works together with the bridge, the nut, and the string anchor points. Tremolos and vibrato systems come in many shapes, and the cavity must match the bridge footprint. For that reason, changing from one tremolo family to another often means new routing, not just a parts swap.

The size of the route also affects how much wood remains in the body. A deeper or wider route reduces mass, which can change sustain and tone slightly, though the effect is subtle compared to wood choice and body construction. Most players choose the route based on the tremolo behavior they want, not the tonal impact.

Recessed vs. non-recessed routes

The first question to answer is whether the route is recessed. In a non-recessed route, the base plate sits flush on the top of the body and the block drops into a cavity that is just deep enough for the springs. Pushing the arm lowers the pitch, but the bridge hits the body quickly, so you cannot pull up. This is common on vintage style guitars and many budget models.

In a recessed route, the cavity is deeper and the whole bridge assembly sits below the top surface. The block has room to move both ways, so the bridge floats and you can bend notes sharp. This is the setup most players mean by a fully floating tremolo. The trade-off is tuning stability: a floating bridge moves in response to any string tension change, so bending one string affects the others. You may need to lock the nut or use a locking tremolo to keep everything stable.

When you are comparing guitars, look for the term "recessed" in the spec sheet. If it is not listed, the bridge is probably mounted flush. If you want to dive and pull up, a recessed route is essential. If you rarely use the arm and prefer a solid feel, a non-recessed route is simpler and easier to maintain.

Floyd Rose style routing

Floyd Rose style double-locking tremolos need a wider and deeper route than most vintage units. The locking nut at the headstock and the locking saddles at the bridge keep the strings fixed, but the cavity still needs clearance for the sustain block in both directions. Many Ibanez models in the JEM, JS, RG, and S lines ship with this style of routing. Ibanez notes that these models, developed with Steve Vai, Joe Satriani, and Paul Gilbert, are still considered the standard in hard rock and instrumental rock guitars.

A Floyd style route pairs with specific setup steps. If you are new to the system, start with how to set up a Floyd Rose tremolo and then use a Floyd Rose maintenance guide to keep the knife edges and saddles in good shape. The spring claw is usually accessible through a cover on the back, allowing you to adjust tension without removing the strings.

Because the route is deeper, the body must be thick enough to accommodate it. Most solid body electric guitars are thick enough, but some thinline or semi-hollow designs cannot accept a Floyd Rose without major modification. Always check the body depth and the route dimensions before assuming a Floyd Rose can be installed.

Vintage six-screw and two-point routing

Vintage style bridges, such as the six-screw units on many Fender guitars, use a shallower route. Six screws hold the base plate to the face of the body, and the block hangs into a cavity that does not need to be as deep. Two-point bridges use a knife edge on two studs instead of six screws, which changes the pivot feel but still allows a relatively shallow cavity. Both designs are common on guitars with non-recessed mounting, though some modern two-point units are recessed to allow pull-up.

Neither style is inherently better. The six-screw design has been around for decades and is known for a firm, stable feel. Two-point designs tend to have a smoother action. If you want the full comparison, read two-point vs. six-screw tremolos.

The vintage style route is usually rectangular and may be covered by a chrome plate on the back. The spring claw is mounted inside, and you can adjust the number of springs or the claw screws to change the tension. A guitar with this route is a good choice if you want a classic look and a simple setup.

Spring claw and cavity depth

The rear cavity holds the springs and the claw that anchor them to the body. The claw screws pull against the block, and the number of springs determines how much tension resists the strings. A deeper cavity gives you more room to adjust the claw position, which is important for fine-tuning the float.

When you set up a tremolo, you need to balance the spring tension against the string tension. If the springs are too loose, the bridge tilts forward and the pitch goes sharp. If they are too tight, the bridge stays flat against the body and you lose the floating feel. For a recessed route, you want the bridge to sit parallel to the body when the strings are at pitch. For a non-recessed route, the bridge should rest on the body with slight downward pressure.

The number of springs you use is a matter of preference. More springs make the arm stiffer and help with heavier string gauges. Fewer springs give a softer feel but may cause tuning issues if the bridge floats too much. There is no universal rule; it depends on your playing style and the gauge you use. If you are unsure, start with the factory configuration and adjust gradually.

Choosing a guitar for your tremolo needs

Before you buy, check the route type on the spec sheet or ask the builder. If you want to perform dive bombs and pull ups, you need a recessed route. If you are happy with gentle downward vibrato, a non-recessed route is fine. Also consider the string block length and the spring claw location. Some bodies have a cavity cover that is easy to remove for spring adjustments.

The guitar action and setup is affected by the tremolo system. A floating bridge demands a precise balance between string tension and spring tension. If you plan to change tunings often, a non-floating unit might be more practical. Read about tremolo vs. hardtail to decide which approach suits your playing style.

You should also think about the bridge type before choosing a guitar. A Floyd Rose offers extreme range but requires a locking nut and a proper route. A vintage or two-point unit is easier to maintain and works well for subtle vibrato. If you are buying a beginner electric guitar, a simple tremolo with a non-recessed route is often the best choice. You can learn the basics without worrying about float and locking systems. Later, you can upgrade to a more advanced setup if you find that the tremolo becomes important to your style.

What to pick for your use

Questions

Can I replace a vintage tremolo with a Floyd Rose on the same route?

Usually not. Floyd Rose bridges need a wider and deeper cavity, so the body must be routed again. Changing the bridge type requires professional work, and you should measure the existing route before buying a new bridge.

What is the difference between a recessed and a non-recessed tremolo route?

A recessed route is carved deeper so the bridge can move both up and down. A non-recessed route keeps the bridge flush with the body, so you can only push down.

Do all Ibanez guitars come with a recessed Floyd Rose route?

No. Many Ibanez models have a recessed route, but some have a non-recessed or a simpler two-point tremolo. Check the specific model specifications on the Ibanez website.

Can I adjust the spring tension without removing the strings?

Yes, if the cavity cover is accessible. You can turn the spring claw screws to change the balance, but the strings must be detuned if you need to change the number of springs.

Does the tremolo route affect the guitar's resonance?

The amount of wood removed changes the body's mass and stiffness, which can influence sustain and tone. A deeper route may slightly alter the acoustic response, but the effect is small compared to wood choice and construction.

How many springs should I use in my tremolo?

There is no fixed number. More springs give a stiffer feel and more tension, which is useful for heavier strings. Fewer springs give a softer feel but may cause tuning instability if the bridge floats too much.

Can I install a tremolo on a guitar that doesn't have a route?

Yes, but it requires routing the body. This is a permanent modification that should be done by a qualified luthier. You also need to consider the top wood thickness and whether the body has enough material.