How to Set Up a PRS Tremolo: The 1/16-Inch Float and the F# Test

Here's the short answer. A PRS tremolo is meant to float about 1/16 of an inch off the body, sitting on six notched brass pivot screws that are all level with each other, with the springs out back balanced so that pulling the arm all the way up raises the open low E to F#, a whole step, and no further. That's PRS's own spec, and a guitar set that way returns to pitch very well. When a PRS trem "won't stay in tune," the usual story is that it has drifted away from that spec: pivot screws cranked down, a claw that was never readjusted after a string-gauge change, or a nut that grabs the strings.

It's all adjustable with a screwdriver and a tuner. But there's one mistake that can do real damage, and it's the first thing people reach for.

Why a PRS trem isn't just a Strat trem with nicer parts

From across the room it looks like a six-screw vintage Strat bridge. Up close, the details are different, and those details are why the setup numbers matter.

Paul Reed Smith patented his tremolo in the mid-1980s. The front edge of the plate is countersunk into a knife edge at each screw hole, and each of the six brass mounting screws has a matching notch under its head, so the plate pivots in those notches rather than rubbing on plain screw shanks. The arm is unthreaded and push-in, held by a small set screw, so it doesn't wobble or unscrew itself mid-song.

PRS describes the Core and Private Stock bridges as machined (solid brass block), while S2, SE and CE bridges are molded, with a cast block. The Gen III update, which PRS dates to 2015 on Core models, keeps the design but adds a larger-thread pivot screw with a redesigned head and grooves in the plate that fit the saddle height screws. A pre-2015 Core trem isn't a problem on a used guitar. It's just an earlier version of the same idea.

The mistake: turning the pivot screws with the strings at pitch

Those six screws are the fulcrum. When the guitar is tuned up, the knife edge of the plate is pressed hard into each screw's notch. If you turn a screw under that load, you're grinding the two parts against each other, and PRS's own setup notes warn that it can ruin the knife edge. A worn or rounded knife edge won't settle back into the same spot every time you let go of the bar, and that shows up as the guitar drifting a few cents after every dive.

So slacken the strings before you touch the pivot screws. Make small adjustments, keep all six at the same height, and make sure the notch under each head actually lines up with its hole in the plate. PRS also suggests a drop of light machine oil under each screw head to help the plate pivot smoothly.

Setting it up, step by step

This follows PRS's own sequence. The order matters, because the float and string tension affect each other.

1. New strings, stretched properly. Stretch them thoroughly before you judge anything. A string that's still settling will make a good trem look bad.
2. Neck relief. PRS's spec is roughly .005" to .010" of relief. Set this before the bridge.
3. Action. PRS measures action at the 1st and 12th frets. Get it close now, because saddle height and float affect each other a little.
4. Set the float. With the strings slack, level the six pivot screws. Tune to pitch, then pull the back cover and adjust the two claw screws about a quarter-turn at a time. Counter-clockwise raises the back of the bridge and clockwise lowers it. Retune after every adjustment, because each one changes the balance. You're aiming for about 1/16" between the body and the underside of the bridge, with the plate parallel to the strings rather than tipped up or down.
5. Do the F# test. Pull the arm up as far as it will go. The open low E should rise to F#. If it only reaches F, the bridge is floating too low. If it goes past F#, it's floating too high. This one check tells you more than a ruler does.
6. Intonation last. Use the six screws at the back of the bridge to match the 12th-fret note to the harmonic, retuning as you go.
7. Check the nut. A tiny bit of lubricant in each slot. Most return-to-pitch trouble on any trem guitar starts at the nut, and we've covered that in detail in our piece on why a guitar won't come back in tune after the whammy bar.

Float it or deck it? My take

This is where PRS owners argue. Plenty of players tighten the claw until the bridge sits flat on the body, so it only dives. They give up pulling up in exchange for bends that don't pull the other strings flat and a guitar that stays roughly playable if a string breaks. On a Strat, I'd tell most people to deck it, and I've said so in our float, deck or block piece.

On a PRS, I lean the other way. This bridge was designed around the float: the knife edges, the block position, and the spec PRS publishes all assume a bridge sitting about 1/16" up. Set up as designed, it's about as stable as a non-locking trem gets, and that's what the listings bear out. On the Laurel Burl SE Custom 24 that came through here, the notes read "the trem feels solid, the tuning stability is dependable." The CE 24 Wood Library in stock right now was noted with "the tremolo feels smooth, the locking tuners hold tune properly."

The fair counterpoint: if you play a lot of double-stop bends, change tunings often, or never pull up on the bar, decking it is a reasonable and fully reversible choice. Just do it on purpose, not because the claw drifted there.

What to check on a used PRS trem

If you're buying a used PRS with a tremolo, these are the things I'd look at, in about a minute:

• Where the bridge sits. Sight along the top. Floating, flat on the wood, or tipped up steeply? A steep tilt usually means the claw wasn't readjusted after a gauge change.
• The pivot screws. Level with each other? Heads chewed up? Uneven or cranked-down screws suggest someone was fighting a tuning problem the wrong way.
• The F# test. Ask to try it. It takes ten seconds and tells you whether the float is where PRS intended.
• The arm. Is it there, and does it stay put? A missing arm is cheap to replace; a floppy one usually just needs the set screw snugged.
• Return to pitch. Do a few moderate dips and check the tuner. If it comes back a little sharp every time, look at the nut before you blame the bridge.

Our full used PRS checklist covers the rest: neck, frets, electronics and finish.

If you'd like to feel a PRS trem that's already set up, the 2025 PRS CE 24 Wood Library in Emerald Green quilt is on the bench now. Everything else we have is in our guitars in stock.

FAQ

How far should a PRS tremolo float off the body?

About 1/16 of an inch, per PRS's own setup spec, with the six pivot screws level and the plate parallel to the strings. The practical check is pulling the arm all the way up: the open low E should reach F#.

Why won't my PRS stay in tune after using the tremolo arm?

Usually a binding nut, a bridge that's out of balance after a string-gauge change, or pivot screws that have been cranked down or adjusted under tension. Lubricate the nut slots, reset the float to spec, and check that the pivot screws are level before you think about replacing parts.

Can I deck a PRS tremolo flat to the body?

Yes. Tighten the claw until the plate rests on the body. You lose the ability to pull up, and you gain some stability for bends and string breaks. It's reversible in a few minutes. The bridge was designed to float, though, so try it at spec first.