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  • FSA SL-K Carbon SB20
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FSASL-K Carbon SB20

Item # FSA002Y

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  • Black Graphic, 27.2mm, 350mm ($90.99)
  • Black Graphic, 31.6mm, 350mm ($90.99)
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Item # FSA002Y

Lightweight and pleasingly stiff.

Tipping the scales at a mere 222 grams, the FSA SL-K Carbon SB20 drops precious grams from your trusty steed while optimizing stiffness and ride quality. FSA's unidirectional carbon provides ample stiffness and vibration damping at a weight that's not much heavier than FSA's top-shelf posts. It's available with a 20 millimeter offset in either 27.2 or 31.6-millimeter diameters, at a length of 350 millimeters. Both available posts come with a polymer Di2 battery holder for keeping up with future drivetrain standards.
  • Drops weight while enhancing stiffness and ride quality
  • Unidirectional carbon for stiffness and vibration damping
  • Bonded alloy head with chromoly hardware for longevity
  • 20mm offset, in either 27.2 or 31.6mm diameter posts
  • Comes with a polymer Di2 battery holder
Tech SpecsWeight
Tech Specs
[post] carbon fiber, [head] bonded alloy
27.2mm, 31.6mm
Recommended Use
cross-country, road cycling
Manufacturer Warranty
2 years

Actual Weight

Actual weights are measured in-house by the Competitive Cyclist team.

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Black Graphic, 27.2mm, 350mm
Black Graphic, 31.6mm, 350mm

Claimed Weight

Claimed weights are provided by the vendor.

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[27.2 x 350mm] 222g

Reviews & Community


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Unanswered Question

164g is the actual weight you measured for the 27.2 seatpost?

Does this seatpost clamp work with 7x9 carbon saddle rails?

Hey! It should work given the head design of the post but FSA tech docs don't explicitly say that. Given how the clamp works, this is a fairly common design that works on 7x9. If you order it and it doesn't work out give us a shout for a free return label + exchange.

Avg. ride time: 2h 37m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Super Light Nice Post w/ A Good Clamp

  • Familiarity: I've put it through the wringer

I had this seatpost on my Cervelo R3 and loved it. The seatpost is often over looked on the bike build, but can make a huge difference in performance and weight. I was impressed with the light weight of the post and how well it dampened the road chatter.

The saddle clamp is also intuitive and effective. I want my saddle tilt to be perfect and with some post it can be difficult to adjust, not this clamp. It was easily adjustable on the fly and could be micro adjusted to exactly what I wanted. Once set it never budged.

Let me know if you have any questions: or 801-619-7476