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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 seatpost with an adjustable head and 27.2 mm, 30.9 mm, or 31.6 mm size options. Choose the diameter that matches your bike’s seat tube before selecting an offer, and confirm the 400 mm length works for your setup.

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SKU: B0945T4LDD Category:

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Quick Summary

The Bynccea bicycle seat post is a 400 mm seatpost offered in 27.2 mm, 30.9 mm, and 31.6 mm sizes. It is made from forged aluminum alloy 6061 T6 and has an adjustable head.

Key Details

Detail Product information and buyer relevance
Brand Bynccea
Product type Bicycle seat post for selecting the correct seat tube size
Length 400 mm, which affects saddle height and fit
Available sizes 27.2 mm, 30.9 mm, 31.6 mm, so the seat tube diameter must match the chosen option
Material Forged aluminum alloy 6061 T6
Head Adjustable head

What to Compare Before Buying

  • Seat tube diameter: Choose the option that matches your bike’s marked diameter.
  • Length: The post is 400 mm long, so compare that length with your saddle height needs and frame setup.
  • Head style: The adjustable head matters if you want a post with saddle angle adjustment.
  • Bike type: This seat post is listed for mountain bikes, road bikes, MTB, and BMX, so the exact frame fit still depends on the diameter you select.

Before You Decide

Confirm the seat tube diameter before choosing an option, since this seatpost comes in 27.2 mm, 30.9 mm, and 31.6 mm sizes. Also check that the 400 mm length and adjustable head match your setup.

Seatpost Insertion and Saddle Fit

The 400 mm measurement is the post’s overall length, not the amount that will sit above the frame. Check the frame and seatpost instructions for the required insertion depth, and make sure the post can reach your intended saddle height while remaining inserted as required. Also confirm that the adjustable head’s clamp accepts your saddle’s rail shape and diameter.

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