Sapim Double Square Polyax Brass Nipple 14G 16 mm – Black
The Sapim Double Square Polyax is a 16 mm, 14G spoke nipple in black brass. It can be tightened from both sides: with a standard Sapim nipple driver from the tyre side of the rim, or with a spoke key from outside. The Polyax head follows the spoke angle, so the spoke is not bent at the thread.
Why the Double Square Polyax?
Works from both sides. According to Sapim, the nipple can be turned with the standard Sapim nipple driver from the rim bed, or from the inside with an inverted straight nipple driver.
No slot, more torque. The head has a square drive instead of a slot. Sapim states that this allows a higher torque on the nipple.
Scratch-free coloured nipples. The driver bit grips the square, so the black finish is not scratched during building.
Polyax head. The rounded head lets the nipple follow the spoke line by up to 12° in the rim hole, so the spoke is not bent where it enters the nipple.
16 mm, 14G thread. Fits 14G (2.0 mm) spokes such as Sapim CX-Ray and Sprint.
Built for wheel-building machines
Sapim developed the Double Square for the Holland Mechanic OT wheel-building robot in its Pro Line series. The robot drives the nipple directly with a bit from the rim bed instead of holding it with nipple hands, which Sapim says allows higher spoke tension.
Who is it for?
- Booda Bike owners. It is the nipple in the wheels of our bikes, so it is the right spare when a nipple has to be replaced.
- Wheel builders. A brass nipple that can be tightened from the rim bed or from outside.
- Everyday and all-weather riders. Brass is the robust choice for wheels that see rain and winter roads.
Specifications
| Model | Sapim Double Square Polyax |
|---|---|
| Material | Brass |
| Gauge / thread | 14G (2.0 mm) |
| Length | 16 mm |
| Finish | Black |
| Tightening | Square drive at the head (Sapim nipple driver), nipple flats at the shaft (spoke key) |
| Fits | 14G (2.0 mm) spokes, e.g. Sapim CX-Ray and Sprint |
| Sold | Per piece |
Frequently asked questions
Which tool do I need for the Double Square Polyax nipple?
From the tyre side, a square-drive nipple driver such as the Sapim nipple driver; remove the tyre, rim tape and valve first. From outside the rim, a standard spoke key on the nipple flats.
How is it different from the normal Polyax nipple?
The normal Polyax has a slotted head. The Double Square has a square drive instead of the slot, so it can be driven with a nipple driver from the rim bed and takes a higher torque, according to Sapim.
Is it the nipple used on Booda Bike wheels?
Yes. We build our wheels with this black brass Sapim Double Square Polyax nipple.
How many do I need?
One nipple per spoke, for example 32 for a 32-hole wheel. Order a few extra as spares.
Why buy Sapim nipples from BoodaBike?
- Sold per piece. Buy a few spares or a full set for a new wheel, you pay for exactly what you need.
- Orderable even when out of stock. If it is not on the shelf, you can still order it.
- Matching spokes. Black Sapim CX-Ray and Sprint spokes are cut to your length in our workshop.
- Used in our own wheels. We use Sapim spokes and nipples in the wheels we build ourselves.
BoodaBike grew out of Massive Bikes, a Budapest workshop that has been building belt-drive and hub-gear bikes since 2013.
On a built wheel
About Sapim
Sapim is a Belgian manufacturer that has specialised in bicycle spokes and nipples since 1918. From its headquarters in Wilrijk (Antwerp) and more than six factories in Europe and Asia, the company can produce around 600 million spokes and nipples a year.
Sapim introduced the CX-Ray aero spoke and the Polyax nipple in 1995, and both are still benchmarks in wheel building today. The company also runs its own independent testing department (Cycling Parts Testing) for wheel and bicycle manufacturers.