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Bynccea 400mm Bike Seat Post, 27.2mm, 30.9mm, 31.6mm

$14.99 (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 bike seat post is a 400 mm seatpost with 27.2 mm, 30.9 mm, and 31.6 mm size options. It includes an adjustable head and uses forged aluminum alloy 6061 T6. Check the correct diameter and length for your bike before choosing an offer.

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SKU: B09462GC24 Category:

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Quick Summary

The Bynccea bike seat post is a 400 mm seatpost with size options in 27.2 mm, 30.9 mm, and 31.6 mm. It is meant for riders who need the correct diameter for their bike frame and seat tube setup.

The seatpost uses an adjustable head, which is a useful detail to compare if you want a seatpost with an adjustable saddle mounting setup. Confirm the diameter and length before choosing an offer.

Key Details

Detail Product information and buyer relevance
Brand Bynccea – helps identify the exact seatpost.
Product type Bike seat post – a replacement or upgrade part for compatible bicycles.
Length 400 mm – important for fit and seat height setup.
Diameter options 27.2 mm, 30.9 mm, 31.6 mm – the buyer must match the correct size to the bike.
Material Forged aluminum alloy 6061 T6 – a stated material specification for the seatpost.
Head Adjustable head – relevant if you want an adjustable saddle mounting setup.

What to Compare Before Buying

  • Diameter: Match the seatpost diameter to your bike’s seat tube size. The available sizes here are 27.2 mm, 30.9 mm, and 31.6 mm.
  • Length: This seatpost is 400 mm long, so compare that length with the position you want for saddle setup.
  • Head style: The adjustable head matters if you want that style of saddle mounting arrangement.
  • Bike fit: Check the exact size your frame uses before selecting an offer.

Before You Decide

Confirm the correct seatpost diameter for your bike, then check whether the 400 mm length works for your saddle position. If you want an adjustable head, make sure that feature matches the setup you need.

Check Saddle Mount Compatibility

The adjustable head description does not specify which saddle rail shapes or mounting hardware it accepts. Before selecting a seatpost, confirm that the head can clamp the rails on your saddle and that any required hardware is compatible with the chosen configuration.

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