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Boenoea 400mm Aluminum Alloy Bicycle Seatpost, 27.2mm

$7.99 (Price correct as of 11/12/2026 12:44 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.)

The Boenoea bike seatpost is a 400 mm aluminum alloy seat tube in 27.2 mm size, finished in black. It is the bicycle part to compare if you need a replacement seatpost that matches your frame opening, and the saddle clamp is not included.

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SKU: B0CL956YN5 Category:

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Quick Summary

The Boenoea bike seatpost is a 400 mm aluminum alloy bicycle seat tube in 27.2 mm size. It is meant for a bicycle seat setup where the post diameter matches the frame, and the saddle clamp is not included.

Key Details

Detail Product information and buyer relevance
Brand Boenoea. Useful for identifying the exact seatpost line.
Product type Bicycle seatpost / seat tube. Check that this is the part you need, not a saddle or clamp.
Length 400 mm. Compare this with the length you want for your bike setup.
Diameter 27.2 mm. The post diameter must match the frame opening.
Material Aluminum alloy. A key check if you prefer this material type.
Color Black. Helpful if appearance matters to your build.
Saddle clamp Not included. Plan for a separate clamp if your setup needs one.

What to Compare Before Buying

  • Post diameter: This version is 27.2 mm. Match the diameter to your frame before choosing a seatpost.
  • Length: The post is 400 mm long. Compare that with the amount of post length you want available on the bike.
  • Included parts: The saddle clamp is not included. Check whether your current setup already has one.
  • Fit: Confirm the selected seatpost size before ordering, since the product line offers multiple diameter choices.

Compatibility, Size and Fit

This seatpost is identified as a 27.2 mm, 400 mm bicycle seat tube. The main fit check is the frame diameter requirement, since the post must match the bike’s seat tube opening. The product text also points to use with road bikes, mountain bikes, fixed gear bikes, and BMX bikes, so the exact bike setup still depends on the frame size and the parts already on the bike.

What Else You May Need

A separate saddle clamp may be needed if your current setup does not already include one. The saddle itself also needs to be compatible with the clamp arrangement on your bike.

Before You Decide

Confirm the 27.2 mm diameter, the 400 mm length, and whether you need a separate saddle clamp. If those points match your bike setup, this seatpost is the right type to compare against other offers.

Additional Fit Check

The 27.2 mm diameter is one fit dimension, not confirmation of compatibility with a complete bike. Check the frame’s required seatpost diameter and the frame and seatpost manufacturers’ minimum insertion requirements. The 400 mm overall length does not mean the full post can extend above the frame.

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