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PLATT 30.8 mm x 350 mm Aluminum Bike Seatpost, Black

$9.99 (Price correct as of 11/12/2026 23:59 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 PLATT US054 is a black 6061 aluminum alloy bicycle seatpost measuring 30.8 mm in diameter and 350 mm long. This configuration is one seatpost and has a marked minimum insertion line. Confirm that your bicycle requires a 30.8 mm post and that the 350 mm length suits its setup; follow the insertion mark and applicable installation instructions.

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SKU: B08PCQL8LF Category:

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Quick Summary

The PLATT US054 is a black bicycle seatpost made from 6061 aluminum alloy. This version measures 30.8 mm in diameter and 350 mm long, and has a marked minimum insertion line.

Key Details

Detail Product information and buyer relevance
Part number US054, for identifying the PLATT seatpost.
Diameter 30.8 mm. Match this to the exact seatpost diameter required by your bicycle.
Length 350 mm. Check that this length suits your bicycle’s setup.
Material and color 6061 aluminum alloy; black.
Quantity One seatpost.
Insertion mark A minimum insertion line is marked on the post. Follow the mark and applicable installation instructions.

What to Compare Before Buying

  • Diameter: Confirm the exact diameter required by your bicycle. The 30.8 mm version is not a substitute for a different required diameter.
  • Length: Check that a 350 mm post suits your bicycle’s fit and adjustment needs.
  • Insertion limit: Account for the marked minimum insertion line when checking fit, and follow the bicycle’s applicable installation instructions.

Before You Decide

Confirm the required 30.8 mm diameter, the 350 mm length and the marked insertion limit before selecting this single-seatpost version.

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