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Bynccea Bicycle Seat Post, 400 mm, 27.2 / 30.9 / 31.6 mm

$13.99 (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.)

The Bynccea bicycle seat post is a 400 mm MTB seatpost with 27.2 mm, 30.9 mm, and 31.6 mm size options. It also features an adjustable head, so matching the exact diameter to your bike is the key buying check.

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SKU: B0946JL8LX Category:

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Quick Summary

The Bynccea bicycle seat post is a 400 mm seatpost with size options listed as 27.2 mm, 30.9 mm, and 31.6 mm. It is described as an MTB seatpost with an adjustable head for installation on a bike that matches the chosen diameter.

Key Details

Detail Product information and buyer relevance
Brand Bynccea. Useful for identifying the exact seatpost family.
Product type Bicycle seat post. Check that this is the part you need, not a saddle or clamp.
Length 400 mm. Compare the stated length with the space and setup you want.
Diameter options 27.2 mm, 30.9 mm, and 31.6 mm. Match the selected diameter to your bike frame and current seatpost size.
Material Forged aluminum alloy 6061 T6. Material choice can matter when comparing similar seatposts.
Adjustable head Adjustable head. Check whether the saddle mounting style matches your bike and saddle setup.

What to Compare Before Buying

  • Diameter: Choose the exact 27.2 mm, 30.9 mm, or 31.6 mm version that matches your bike.
  • Length: The seatpost is 400 mm long, so compare that length with the setup space you need.
  • Head style: The adjustable head matters if you need a particular saddle mounting style.
  • Material: The seatpost is forged aluminum alloy 6061 T6, which is a useful comparison point against other seatposts.

Compatibility, Size and Fit

This seatpost is only a fit when the selected diameter matches your bike. Check the existing seatpost marking or the frame’s required seatpost size before choosing an offer. The 400 mm length is another important check for your riding position and adjustment range.

Before You Decide

Confirm the exact diameter first, then compare the 400 mm length with your bike setup. If you need a seatpost with the adjustable head style, make sure that matches your saddle mounting needs before you choose an offer.

Additional Fit Check

Before choosing a replacement, check that the seatpost can reach your intended saddle height while remaining inserted to the minimum depth specified for the post and frame. Also confirm that the saddle rails fit the adjustable head’s clamp; the head description alone does not establish compatibility with every saddle.

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