ONIPAX Anti-Theft Bicycle Seat Post Clamp Aluminum Alloy 31.8MM/34.9MM
$16.00
🔒 Anti-Theft Design You Can Trust Protect your bike from saddle theft with ONIPAX’s secure clamp system. Featuring a tamper-resistant 7-lobe bolt, this clamp deters quick release attempts and adds a strong layer of security to your ride — whether you park in the city or on campus. ⚙️ Durable...
Protect your bike from saddle theft with ONIPAX’s secure clamp system. Featuring a tamper-resistant 7-lobe bolt, this clamp deters quick release attempts and adds a strong layer of security to your ride — whether you park in the city or on campus.
⚙️ Durable & Lightweight Aluminum Alloy
Crafted from high-grade 6061 aluminum, this clamp combines strength with minimal weight. It's built to endure outdoor elements without compromising your bike’s performance or adding bulk.
📏 Compatible with Most Seatposts
Available in both 31.8mm and 34.9mm sizes, this clamp fits a wide range of standard seat tubes. Ideal for road bikes, mountain bikes, city bikes, and folding bikes — be sure to check your seat tube’s outer diameter before ordering.
🛠️ Quick Installation, No Fuss
Forget about tools that strip easily or complex setups. Our clamp is easy to install with a 7-lobe security tool (sold separately). You’ll have it mounted and secured in minutes.
🧩 Minimalist Design, Maximum Function
With a clean, matte finish and low-profile look, the ONIPAX clamp integrates seamlessly with your bike’s design — adding security without sacrificing style.
🌍 Trusted by Cyclists Worldwide
ONIPAX has been supporting cyclists from Taiwan to the world for over 30 years. Our mission is to create reliable bike components that combine smart engineering with practical design.
❓ Frequently Asked Questions (FAQ)
Wondering how to install it or what tools you need? Scroll down to our FAQ section for answers on compatibility, setup, and more.
Q1: What seatpost sizes does this clamp fit?
A: This clamp is available in 31.8mm and 34.9mm sizes, which fit seat tube outer diameters of most modern bikes. Please measure your bike’s seat tube before ordering to ensure proper fit.
Q2: Does it come with the security tool?
A: The security tool (7-lobe torx key) is not included by default, but you can purchase it separately on our website or select the tool bundle option if available.
Q3: Is this clamp compatible with carbon frames or seatposts?
A: We recommend using this clamp only on aluminum or steel frames. For carbon frames or seatposts, consult your bike manufacturer to avoid damage or overtightening.
Q4: Can I install it by myself?
A: Yes, installation is simple. All you need is the matching 7-lobe tool. Just slide the clamp onto your seat tube and tighten to the recommended torque (approx. 4-5 Nm).
Q5: Will this prevent all types of saddle theft?
A: This clamp is designed to deter opportunistic theft by replacing quick-release mechanisms with a security bolt that requires a special tool.
