Quick Summary
The ONIPAX Anti-Theft Bike Seatpost Clamp is a seatpost clamp with a 7-lobe pin bolt design. It is offered in 31.8 mm and 34.9 mm sizes, so the frame tube diameter needs to match the chosen clamp size.
This clamp is aimed at buyers who want a locking-style seatpost clamp rather than a quick-release lever. The size check matters most here, because the frame tube outer diameter is the key fit point.
Key Details
| Detail | Verified information and buyer relevance |
|---|---|
| Brand | ONIPAX – the named brand on the product. |
| Product type | Anti-theft bike seatpost clamp – a clamp for securing the seatpost area. |
| Size options | 31.8 mm and 34.9 mm – choose the size that matches the frame tube outer diameter. |
| Fastening | 7-lobe pin bolt – a specialised fixing that needs the matching key for removal. |
| Fit check | Measure the frame tube outer diameter, not the seatpost itself, before choosing a size. |
What to Compare Before Buying
- Frame tube diameter: The clamp is offered in 31.8 mm and 34.9 mm sizes. Match the size to the outer diameter of the frame tube.
- Removal method: This uses a 7-lobe pin bolt rather than a quick-release lever. Compare that with the level of access you want after fitting.
- Fit point: The frame tube outer diameter is the dimension that matters, not the seatpost diameter.
What Else You May Need
The matching 7-lobe key is needed for removal of the pin bolt fixing.
Before You Decide
Confirm whether you need the 31.8 mm or 34.9 mm version before choosing an offer. Check the frame tube outer diameter carefully, and make sure you are comfortable with a keyed clamp rather than a quick-release lever.
