International Delivery 
Sapim Polyax Double Square Alu Nipple 14G 16 mm – Black
The Sapim Polyax Double Square nipple is a 16 mm, 14G aluminium spoke nipple made of 7075-T6 alloy, anodised black. Its square drive is tightened from inside the rim, which makes it the right nipple for deep-section and carbon rims where the classic nipple flats are hidden. It is light, precise and keeps its tightening surfaces undamaged.
Sapim Double Square Polyax nipple – manufacturer image. The nipples we sell are black.
The problems it solves
- Nipples you cannot reach. On deep and carbon rims the nipple flats sit inside the rim. The Double Square is tightened from the inside of the rim with a square-drive tool, so the wheel can still be built and trued.
- Damaged nipple flats. Because the tool works on the square drive inside the rim, the tightening surfaces stay undamaged.
- Heavy wheels. 7075-T6 aluminium is much lighter than brass – the weight saving is at the rim, where it matters most.
- Spokes that break at the nipple. The Polyax head aligns with the spoke angle, so the spoke is not bent at the thread.
Who is it for?
- Riders with deep-section or carbon rims who need a nipple that can be adjusted from inside the rim.
- Road, triathlon and gravel riders building light performance wheels – a perfect match for black Sapim CX-Ray spokes.
- Wheel builders using centring machines – Sapim designed the Double Square shape for them.
Key features
- Double Square drive – tightened from the inside of the rim; the tightening surfaces stay intact.
- Polyax head – self-aligning with the spoke angle.
- 7075-T6 aluminium, anodised black – light and corrosion resistant.
- 16 mm length – reaches through deeper rim profiles.
- 14G (2.0 mm) thread – fits Sapim CX-Ray, Sprint and other 14G spokes.
Our black Double Square aluminium nipples.
Specifications
| Model | Sapim Polyax Double Square |
|---|---|
| Gauge / thread | 14G (2.0 mm) |
| Finish | Black anodised |
| Tightening | Square drive from inside the rim |
| Fits | 14G (2.0 mm) spokes; deep-section and carbon rims |
| Sold | Per piece |
Frequently asked questions
Which tool do I need?
A square-drive nipple tool that reaches the nipple from the tyre side of the rim (for example the Sapim nipple driver). Remove the tyre, rim tape and valve first.
Aluminium or brass?
Aluminium saves weight and is the usual choice for performance and carbon wheels. For everyday wheels ridden on salted winter roads, brass nipples are the more robust choice.
Does it fit my rim?
It fits rims drilled for standard 14G nipples. The 16 mm length is designed to reach through deeper rim profiles.
Why buy from BoodaBike
BoodaBike grew out of Massive Bikes, a Budapest workshop that has been building belt-drive and hub-gear bikes since 2013. We use the same Sapim spokes and nipples in our own wheels.
- Sold per piece – buy exactly as many as you need, including a few spares.
- Matching spokes – black Sapim CX-Ray and Sprint spokes, cut to your length.
- Orderable even when out of stock – we order it in for you.
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 – 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.