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Black Inc Round Seatpost

Power Meter City February 20, 2026

$325.00

Carbon fiber seatpost for road and gravel bikes with easy to use one-bolt saddle clamp

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Black Inc Round Seatpost

The Black Inc Round Seatpost is a lightweight, carbon fiber seatpost for road and gravel bikes. It weighs less than 200 grams and uses a unidirectional carbon weave, making it strong and comfortable over rocky and technical roads. It features a matte and glossy black finish that matches the aesthetic of almost every bike. In addition, this Black Inc seatpost uses clamps for 7×9 mm saddle rails and a one-bolt saddle clamp that makes it super easy to adjust your saddle tilt. This post is available in a 350 mm length and 0 mm or 25 mm setback options. It has a 27.2 mm diameter so it’s compatible with a wide variety of road and gravel bikes.

 

Product Details

Key Features of the Black Inc Round Seatpost

  • Less Than 200 Grams: Made from carbon fiber, this post saves weight on your build.
  • One-Bolt Saddle Clamp: Makes installing and adjusting your saddle exceptionally easy.
  • For Road and Gravel Bikes: The 27.2 mm diameter makes it versatile and a great option for many road and gravel bikes.

Compatibility

This seatpost has a 27.2 mm diameter which makes it compatible with frames that accept 27.2 mm round seatposts. See Compatibility tab for more details.

Considerations

This seatpost is a great option for many riders, but is not compatible with bikes that use proprietary seatposts like many aero or race oriented road bikes.

Advice From Our Staff

We recommend this seatpost for riders who want a lightweight option without compromising on usability. Its saddle clamp mechanism allows quick installation, easy adjustments, and hassle-free saddle swaps. If you’re focused on saving weight or simplifying setup and fine-tuning, this seatpost delivers on both fronts.

Compatibility

  • Frame: Compatible with frames that use a 27.2 mm seatpost diameter.
  • Saddle: Works with saddles that have 7x9 mm rails.

Specs

  • Material: Carbon
  • Seatpost Diameter: 27.2 mm
  • Seatpost Length: 350 mm
  • Saddle Rail Clamp: 7x9 mm
  • Weight: 0 mm offset - 184 grams | 25 mm offset - 195 grams

In the Box

  • Black Inc Round Seatpost
  • 7x9 mm saddle rail clamps
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