Sapim Polyax 14MM 14 Gauge Locking Brass Nipple
The Sapim Polyax is the nipple we fit to most of the wheels we build, and it is worth a page because the nipple is the part of a wheel most people never think about and the part that decides whether the spokes last. A Polyax has a rounded, spherical seat where a conventional nipple has a flat one, which lets the nipple tilt a few degrees in the rim hole so the spoke runs straight into it rather than bending at the rim. That small thing removes the stress riser that breaks spokes at the nipple, and it is why Sapim recommends the Polyax for every rim with angled or unangled spoke holes. Sapim makes it in Belgium in brass and alloy, 14 gauge, 14mm long, in silver, black and colors. This page covers the Sapim Polyax 14MM 14 Gauge Locking Brass Nipple.
We sell Polyax nipples only as part of a wheel we build. Choose your rim, hub and spokes in the configurator and the wheel ships from Georgia laced, tensioned and trued by hand.
Design and construction
A spoke leaves a hub flange at an angle and arrives at the rim at a slightly different one, and on most rims the nipple hole is drilled straight through, so a conventional nipple sits square to the rim and the spoke has to bend to meet it. The Polyax seat is a section of a sphere; it rocks in a matching countersink or against a washer until the spoke is straight, and the load passes through the nipple in a line rather than at a kink. Sapim also puts a thread-lock compound on some versions and cuts the threads to run smoothly on its rolled spoke threads.
Brass Polyax nipples are the durable choice: brass does not corrode, does not round off under a spoke wrench after years, and is kind to a carbon rim bed. Alloy Polyax nipples save about 30 grams a wheel and come in colors, and they are the right choice on a light wheel that is kept clean. Both are 14 gauge for 2.0mm spoke threads; Sapim also makes 12mm, 16mm and internal versions.
How it rides
You do not feel a nipple, but you feel a spoke that breaks, and a wheel built with Polyax nipples on the right seat breaks fewer spokes over its life than one built with flat-seat nipples on the same rim. That is the whole argument, and it is why we use them by default on Sapim, DT Swiss and Pillar spokes alike.
Brass for touring, trail, gravel, e-bike and carbon-rim wheels; alloy for road race and cross-country wheels where the last grams matter.
Specifications
| Material | Brass |
|---|---|
| Type | External 14 |
| Finishes | silver, black |
This version
What this listing covers: the 14mm 14-gauge brass nipple, with a locking thread. Brass is the one to choose for durability, salt and carbon rims; it does not corrode, does not round off and turns in a spoke wrench a decade later. It is the heavier option by roughly 30 grams a wheel, and that is the whole of its downside. Brass also deforms very slightly as it seats, which lets it bed into the rim bed and sit square, and it is far more forgiving of a spoke key that is a size out or an owner who tensions a wheel without much feel. Unless a build is chasing grams or a specific color, this is what we fit, and it is what we fit on every wheel that will see winter.
The locking version carries a thread-locking patch, so the nipple resists backing off on its own once the wheel is tensioned. It is worth having on low spoke-count wheels and on anything that sees sustained vibration, where a nipple that creeps loose shows up as a wheel that will not stay true. It does make the first build slightly stiffer to turn, and it is single-use in the sense that the patch is at its best the first time it is wound on.
Sizes, fit and compatibility
The Sapim Polyax 14MM 14 Gauge Locking Brass Nipple fits any 2.0mm-threaded 14-gauge spoke and any rim drilled for 14-gauge nipples; the rounded seat works with a countersunk rim hole or with a Sapim washer on a flat one. The configurator offers brass or alloy Polyax nipples for every build and recommends brass for carbon rims and heavy-duty wheels.
How Sapim makes its nipples
Sapim's Polyax head is the part worth understanding. A spoke almost never leaves the hub at a right angle to the rim; it arrives at the nipple at a slight angle, and with an ordinary nipple that angle has to be absorbed by bending the spoke right where it is weakest, at the thread. The Polyax head is rounded so the nipple can sit at that angle instead, keeping the spoke and the nipple in line. It is a small piece of geometry that removes a stress riser from the most common place spokes break.
Brass or alloy is a real decision rather than a color choice. Brass is heavier, turns more sweetly under a spoke key, and resists corrosion and rounding far better, so it is what we use on anything that will see winter, salt or hard mileage. Alloy saves a few grams per wheel and comes in colors, and it is a sound choice on a light, well-cared-for build. We will tell you honestly when the weight saving is not worth it.
ProWheelBuilder's part is picking the right nipple for the wheel and lacing it, and we will tell you honestly which one we would use.
Building it at ProWheelBuilder
Sapim makes the Polyax in Belgium; ProWheelBuilder is an independent wheel builder in Georgia, not the manufacturer. We fit Polyax nipples to spokes cut from the measured ERD of the rim, bring the wheel up in stages with a gauge, stress-relieve it and true it before it ships, and we use a four-sided spoke wrench that does not round nipples.
The configurator offers the nipple choice on every build and prices the wheel live.
Alloy or brass, in the locking Polyax?
This is the locking Polyax in brass, at 1.18g against 0.31g for the aluminum version of the same nipple - call it 28g a wheel heavier on a 32-spoke build. That is the entire cost of choosing it, and for most riders it is the right trade.
Brass does not corrode against a steel spoke, does not round off under a slightly worn spoke key, and will still turn when someone needs to true the wheel years from now. Every wheel we build for winter or for long mileage leaves on brass.
Warranty
Manufacturer's warranty. Sapim Nipples warrants this product against defects in materials and workmanship. The duration, conditions and claim process are set by Sapim Nipples and can change without notice, so ask us and we will confirm the current terms before you buy.
ProWheelBuilder. Any wheel we build on this part carries ProWheelBuilder's one-year warranty in addition to the manufacturer's. Broken spokes are replaced for a year whatever the cause, and all wheel-side labor is included - truing, re-tensioning, rebuilding. Where the maker covers a failed rim or hub we handle that claim for you; where they decline, an eligible replacement comes at 25% off current retail. The customer covers shipping in both directions. Components supplied by the customer are not covered.
Full terms are on our Policies & Warranty page.
Polyax 14MM 14 Gauge Locking Brass Nipple questions
Brass or alloy - which should I pick?
Brass, unless you have a specific reason not to. It is about 30 grams a wheel heavier and that is the whole cost; in exchange it does not corrode against a steel spoke, it does not round off under a slightly worn spoke key, and it will still turn years later when someone needs to true the wheel. Every wheel we build for winter or for high mileage leaves on brass.
Is the locking version worth it over the plain one?
On a low spoke-count wheel, or anything that sees sustained vibration, yes - the thread-locking patch stops a nipple creeping loose on its own, which is what a wheel that will not stay true often turns out to be. On a wheel you expect to re-tension and adjust yourself, the plain version is friendlier: it turns freely every time instead of fighting you, and spoke prep gets you much of the same security.
Brass or alloy Polyax?
Brass for durability, corrosion resistance and carbon rims; alloy for about 30 grams saved per wheel and colors on a race wheel that is kept clean.
What does the rounded seat do?
It lets the nipple tilt in the rim hole so the spoke runs straight into it, removing the bend at the rim that breaks spokes.
Which spokes take Polyax nipples?
Any 14-gauge spoke with a 2.0mm thread: Sapim, DT Swiss, Pillar and others.
What length Polyax do I need?
14mm is the standard for most rims; 12mm for thin single-wall rims and 16mm for deep rims. The configurator picks the length for the rim you choose.
Do the nipples match the rim?
Yes. The configurator only offers nipple types the chosen rim accepts (external or internal), in the finish you pick.
Not sure? Text or leave a voicemail on 470-253-0929 or email info@prowheelbuilder.com — you will be talking to the people who build the wheels.
