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Azarxis Bike Seat Post Clamp Aluminum Alloy Quick Release 31.8mm Black

$5.99 (Price correct as of 11/12/2026 12:43 PST · Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

Azarxis bike seat post clamp in black, sized at 31.8 mm for the frame seat tube outside diameter. It uses a quick release design and installs with a 4 mm Allen head key. Check the frame measurement carefully, since the clamp size is chosen by the seat tube rather than the seatpost itself.

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SKU: B0921SR27V Category:

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Quick Summary

The Azarxis bike seat post clamp is a quick release bicycle seatpost tube tightener clip in black, sized for 31.8 mm. It is meant to help secure the seatpost area on a bike frame, and the size choice matters because this clamp is selected by the frame seat tube outside diameter.

This version is the 31.8 mm clamp. Before choosing it, compare your frame seat tube outside diameter with the stated size and make sure the seatpost clamp size matches the frame, not the seatpost itself.

Key Details

Detail Product information and buyer relevance
Brand Azarxis. Helps identify the exact clamp family.
Product type Bike seat post clamp. Used to secure the seatpost area on a bicycle frame.
Size 31.8 mm. Check the frame seat tube outside diameter before choosing a size.
Color Black. Useful when matching the bike’s finish.
Material Aluminum alloy. The screws are carbon steel.
Installation Uses a 4 mm Allen head key. Check that you have the needed tool before starting.

What to Compare Before Buying

  • Frame seat tube outside diameter: This clamp is the 31.8 mm version. Match it to the frame measurement, not the seatpost diameter.
  • Seatpost clamp size: The size needs to fit the frame tube correctly so the clamp choice lines up with your bike.
  • Tool access: Installation uses a 4 mm Allen head key, so confirm you have the right tool on hand.
  • Finish: The clamp is black, which may matter if you want the clamp to blend with the bike frame.

Before You Decide

Confirm the frame seat tube outside diameter before choosing this 31.8 mm clamp. Make sure the seatpost clamp size matches the frame tube, not the seatpost itself, and check that you have a 4 mm Allen head key for installation.

YPC AI UpdatedAzarxis 31.8mm Bike Seat Post Clamp | YaptorAzarxis 31.8 mm black bike seat post clamp with quick release design. Match the frame seat tube outside diameter and use a 4 mm Allen key for install.Azarxis bike seat post clamp in black, sized at 31.8 mm for the frame seat tube outside diameter. It uses a quick release design and installs with a 4 mm Allen head key. Check the frame measurement carefully, since the clamp size is chosen by the seat tube rather than the seatpost itself.[

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