Bow Rehair 101 — When and Why
Most string players will happily spend an hour debating strings, and then play for three years on the same bow hair.
It’s an easy thing to overlook. Bow hair doesn’t snap dramatically or go visibly wrong overnight — it fades. The tone dulls by degrees, the bow starts slipping in places it used to grip, and because it happens so slowly, most players assume the problem is their technique. Or their strings. Or the weather.
Often it’s just the hair.
What a rehair actually is
Despite the name, a rehair isn’t a cleaning or a treatment. Your luthier removes every strand of the old hair and replaces it with a completely new ribbon.
Here’s what’s involved. The wedge at the tip of the bow is removed, then the wedge in the frog, releasing the old hair entirely. A fresh hank — typically horsehair, sorted for consistent thickness and straightness — is combed out, tied off at one end, and the tie is seated into the tip mortise with a new wooden wedge. The hair is then combed flat into an even ribbon, measured to the correct length, tied at the other end, and secured into the frog. Length matters enormously here: a millimetre or two too long and you’ll run out of screw adjustment, too short and the bow will never loosen properly.
The whole ribbon is then dampened and left to dry under tension, which sets the hair evenly across its width.
It’s a fiddly, quiet job that takes an experienced hand roughly an hour, and there’s no shortcut version of it.
Four signs your bow is due
1. It slips — and more rosin doesn’t help.
This is the clearest sign. Bow hair grips the string because of microscopic texture along each strand, and rosin clings to that texture. Over time the strands wear smooth and there’s nothing left for rosin to hold onto. If you find yourself rosining more and more often to get the same bite, the hair is finished. Adding rosin to worn hair just puts more dust on your instrument.
2. It grips in patches.
Run a slow bow from frog to tip. If some sections bite and others glide, the hair has worn unevenly — usually because most players favour one part of the bow. Uneven hair makes long, even bow strokes nearly impossible, which is exactly the thing examiners listen for.
3. You’ve lost hairs, especially from one side.
Losing the occasional hair is normal. Losing enough that the ribbon looks visibly thin, or thinner on one side than the other, is not. Uneven tension pulls the stick sideways and the bow starts to feel like it’s fighting you.
4. The hair has gone grey or greasy near the frog.
That’s skin oil, transferred from fingers over months of playing. Oiled hair won’t hold rosin at all. This is also the one you can slow down: try not to touch the hair when tightening or loosening the bow.
One more, easy to miss: if the bow can’t be loosened enough to have slack, or can’t be tightened enough to play, the hair has stretched or shrunk past its usable range. Don’t force the screw — that’s how you crack a frog or strip a thread.
How often?
The general rule is every six to twelve months for a student practising regularly. Professionals and heavy players often go every three to six.
But hours matter more than months. A student practising twenty minutes a day will get much longer out of a rehair than one preparing for a diploma with two hours daily. If you play seriously, judge by feel rather than the calendar.
If your bow has been sitting untouched for years — an instrument found in a cupboard, say — it almost certainly needs rehairing regardless of how little it was played. Old hair degrades on its own, and dormant bows are also where you find moth damage.
Why Singapore is harder on bow hair
Horsehair is hygroscopic: it absorbs moisture from the air and releases it again, expanding and contracting as it does. Our consistently high humidity means the hair sits longer than it would in a drier climate — which is why bows here often feel slack in the afternoon and tight in the morning.
The real strain, though, comes from the swings. Moving between a humid outdoors and a cold, dry, air-conditioned rehearsal room several times a week puts bow hair through repeated expansion and contraction. It stretches out of true faster, and the ribbon loses its evenness sooner. Practically speaking, most players here should expect to rehair at the shorter end of the six-to-twelve-month range rather than the longer.
Two habits that genuinely help:
- Loosen the hair after every session. Every time, without exception. Leaving a bow tight overnight stresses both the hair and the camber of the stick.
- Never leave a bow in a car, or store the case directly under an air-con unit.
What a rehair won’t fix
Worth being clear about, because it saves disappointment. If your tone problems come from old strings, a warped bridge, a slipped sound post, or a bow whose camber has flattened, new hair won’t solve them.
A good luthier will tell you which of these you’re dealing with. If you’re unsure, bring the bow and the instrument together — the diagnosis usually takes minutes.
Getting your bow rehaired at Gramercy
Our luthier, Wang Xiao Yi (Sean), handles rehairing along with setup, restoration and repair work in-house. Bring the bow in and he’ll assess whether a rehair is what you actually need before any work is quoted.
If exams or a recital are coming, book early. A rehair needs a few days of settling before it plays in properly, and turning up the week before a performance with a freshly haired bow is not the experience you want. Aim for at least two to three weeks ahead.
📍 289 Tanjong Katong Road, Singapore 437072 · 📞 +65 6345 3815 · Tues–Sat, 10am–7pm
What to pair with a fresh rehair
Start with new rosin
Fresh hair and an old, glazed cake of rosin is a wasted rehair. Rosin hardens and develops a shiny, non-shedding surface over time, and a cake that’s been knocking around a case for three years won’t deposit properly on new hair.
- Guillaume Violin/Viola/Cello Rosin — $30.50. Clean, controlled grip, and the metal box survives life in a school bag.
- Cecilia Signature Half Cake Cello Rosin — $57.00. For cellists wanting more pull and depth in the low register.
Browse the full rosin range →
Consider whether the bow is worth the rehair
An honest question, and one worth asking before you spend. If the stick is warped, the camber has gone flat, or you’re on the fibreglass bow that came bundled with a starter outfit, the money is often better spent on the bow itself. A rehair on a poor stick gives you a poor stick with new hair.
- Rosenberger Violin Bow — $300.00, available 4/4 down to 1/4. A meaningful step up from a starter bow, with noticeably better response and balance.
- Eurostring Violin Bow Model 780 — the bow included with Eurostring outfits, also sold separately, and a sensible spare.
Browse all bows →
A tip worth the small cost: if you play regularly, keeping a second bow means you’re never without an instrument while one is on the bench — and you can stagger the rehairs so there’s always one that’s freshly done.
Protect the work you’ve paid for
A bow that rattles loose in a soft bag will lose hair and take knocks at the tip, which is the most fragile part of the whole thing. Make sure your case holds the bow properly at both ends.
Browse cases → · accessories →
Prices correct at time of writing.
Frequently asked questions
How long does a rehair take?
The bench work is around an hour, but turnaround depends on the queue. Contact us for current lead times — and always allow extra during exam season.
Can I rehair it myself?
Kits exist. Getting the length, tension and ribbon evenness right is the hard part, and a mistake at the tip mortise can split the head of the bow — the single most expensive repair on a bow. Not worth it.
My bow hair is black, not white. Does that matter?
Black hair is coarser and grippier, common on double bass bows. It isn’t better or worse, just different. Tell your luthier what you prefer, or ask for a recommendation based on what you play.
Should I rehair or just replace the whole bow?
If the stick is straight, the camber is good and you like how it plays, rehair it — a good bow will take many rehairs over a lifetime. If any of those things aren’t true, bring it in and ask.