ONIPAX Bicycle Seat Post Clamp is a simple, reliable bicycle clamp designed to hold saddle height firmly in place. Riders gain peace of mind from consistent riding position and fewer roadside adjustments. Is it the right clamp for the seatpost diameters on your bike?
⚡ At a Glance
- • Clamping Strength: Robust compression locks seatpost, reducing slippage on typical rides
- • Best for: Cyclists who need a lightweight, no-fuss clamp to secure saddle position
- • Not ideal for: Frames or seatposts with outer diameters outside the listed compatibility ranges
Available in 31.8mm and 34.9mm clamp sizes, crafted from Aluminium 6061 Alloy. Approximate weight of 35g keeps added mass to a minimum while providing a firm hold.
Secure saddle position with precise bolt clamping
A single bolt compresses the alloy clamp around the seatpost, using friction to hold the chosen height. Aluminium 6061 Alloy provides a balance of stiffness and lightness suitable for repeated tightening.
Reliable clamping restores and maintains saddle height, preventing the common annoyance of inward or outward seatpost movement during rides.
Minimal weight penalty with aluminium construction
Construction from Aluminium 6061 Alloy yields a low mass around 35g while retaining structural rigidity. The light material reduces overall bike weight compared with heavier metal clamps.
Quick accelerations and handling remain uncompromised because the clamp adds very little weight, making it suitable for performance-conscious cyclists.
Broad fit across common seatpost sizes with two size options
Two clamp diameters map to specific seatpost outer diameters: the 31.8mm clamp corresponds to listed smaller post ODs, while the 34.9mm clamp matches larger post ODs given in the description. Tightening uses a bolt designed for Allen-key adjustment.
Choose the correct clamp size for a snug fit that restores saddle reliability without the need for shims or ad hoc modifications.
✨ The 4 Key Reasons for ONIPAX Bicycle Seat Post Clamp
- Secure bolt fastening, prevents saddle movement during rides and climbs
- Wide size compatibility, fits several common seatpost outer diameters precisely for many frames
- Lightweight aluminium construction, adds approximately 35g overall to the bike without sacrificing strength
- Made in Taiwan manufacturing, backed by seller support for quality issues and assistance
📋 Technical Details at a Glance
- Category: Tools
- Clamp Size: 34.9mm (also available in 31.8mm variant)
- Compatible Seatpost Outer Diameters: 31.8mm clamp fits ODs 27.2mm and 28.6mm; 34.9mm clamp fits ODs 30.4mm, 30.8mm, 30.9mm and 31.6mm
- Material: Aluminium 6061 Alloy
- Weight: Approx 35g
❓ Frequently Asked Questions
Q: Which seatpost outer diameters does each clamp size fit?
A: 31.8mm clamp corresponds to outer diameters 27.2mm and 28.6mm. 34.9mm clamp corresponds to outer diameters 30.4mm, 30.8mm, 30.9mm and 31.6mm.
Q: What material is the clamp made from?
A: Construction uses Aluminium 6061 Alloy, as stated in the product description.
Q: Will the clamp stop my seatpost from slipping?
A: User feedback indicates the clamp securely locks seatpost height and stops slipping, restoring reliable saddle position.
🏆 Our Verdict
Suitable for cyclists who need a lightweight, dependable way to lock saddle height and avoid mid-ride adjustments. The combination of Aluminium 6061 Alloy construction, precise bolt clamping, and clear compatibility ranges is the main selling point. Durable construction and straightforward fit make it a sensible long-term purchase for riders matching the listed diameters.
