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  • Niner RDO Carbon Seatpost
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NinerRDO Carbon Seatpost

Item # NNR0019

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  • Slate, 27.2 ($199.00)
  • Slate, 30.9 ($199.00)
  • Slate, 31.6 ($199.00)
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Item # NNR0019

It will only take one ride on a Niner RDO Carbon Seatpost for you to feel the difference. Whether your ride a hardtail or a full-suspension bike, you'll notice less fatigue at the end of that ride thanks to what Niner calls the 'unstiff' carbon layup. Niner states that its monocoque design deflects up to twice as much as other leading carbon posts; in fact, it'll deflect 8.2mm under a 50kg load. For comparison's sake, Niner's standard-issue carbon posts deflects 6.3mm under the same load.

Unlike other posts that use bonding to join disparate materials, the RDO (Race Day Optimized) post is molded into a single, structurally superior shaft. Niner varies wall thickness and the carbon weave to offer the strength needed, but tunes it to flex so as to allow the post to dampen fatiguing buzz. A simple-to-adjust, two-bolt clamp ensures you'll quickly dial in the perfect saddle position, and it features an alloy head for durability.

The Niner RDO Carbon Seatpost is a zero-offset post and comes in 27.2, 30.9, and 31.6mm diameters. The 30.9 post is 370mm long, while the 27.2 and 31.6 posts are 400mm. The post comes with graphics that complement Niner's frames; Green, Moondust, Tangerine, and Red.

  • Unstiff carbon layup
  • Two-bolt clamp
  • Zero setback design
Tech SpecsWeight
Tech Specs
carbon fiber
27.2 mm, 30.9 mm, 31.6 mm
[27.2mm, 31.6mm] 400 mm, [30.9mm] 370 mm
0 mm
Recommended Use
mounting biking
Manufacturer Warranty
5 years

Actual Weight

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

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Slate, 27.2
Slate, 30.9
Slate, 31.6

Claimed Weight

Claimed weights are provided by the vendor.

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220 g

Reviews & Community


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Unanswered Question

Will the seatpost clamp also work with carbon rail seats?

Proves Itself Over the Miles

  • Familiarity: I've put it through the wringer

The Niner RDO Seatpost looks and feels like a high-end carbon component. The post and lower head are a single piece of carbon, so there's not a lot of weight up high on the post. Fortunately Niner opted for a conventional 2-bolt seat clamp that is easy to adjust and works with all shapes of saddle rail. On the bike (I have the 27.2mm post on my Niner RLT9 Steel gravel bike) it helps with both vibration and bigger hits. It is also a great visual match for the Niner frame!

Niner Seatpost on Custom Build

One of my awesome customers sent me a photo of his custom build Niner (with the Niner RDO post) that we put together. Here it is on Mammoth Rock Trail.

Niner Seatpost on Custom Build

Works as advertised

  • Familiarity: I've used it once or twice and have initial impressions

Just another review from a pleased customer. The post does flex and almost gives a softail feel to my mtn bike. I feel less fatigued and with less back pain when compared to my Thompson post (which is also a solid product).
I have a size large 29er lynskey Ti hardtail. YMMV


  • Familiarity: I've used it several times

I recently added this to my Pivot 429c and it works as advertised. The seatpost is light and the slight bit of flex really makes for a more comfortable ride overall. I installed the seatpost with a small amount of carborn paste and have had no issues with it. I would definitely recommend this product.


  • Familiarity: I've used it several times

Light , looks great, clamping mechanics works great, actually functional as it flexes a tiny bit and absorbs some trail chatter. Perfect on my jet 9 RDO

Lives up to its reputation

  • Familiarity: I've put it through the wringer

I have a Niner MCR (steel hardtail), and added it last season. It does provide a nice little bit of flex, and helped to take a bit of the edge off. I am happy to have purchased it.

Awesome Seatpost!

  • Familiarity: I've put it through the wringer

Seatpost is great, very stiff but at the same time it gives when it needs to and absorbs a great amount of shock. Love niner equipment, wouldn't give up niner for any other brand.

Looks good, feels fine

  • Familiarity: I've put it through the wringer

I'm happy with this....shiny finish, holds the seat very securely. Easy to adjust the to & fro, tip and tilt with the two seatpost bolts. Your seat design pending, the seatpost bolts are long'ish, and could ride near the underside of your seat. Color options are a great touch with their products. I'm not running this seatpost extended very far, so the compliance is probably minimal. This component goes un-noticed, perhaps that is a sign it is well done. Four stars, as it is very pricey, did not come with carbon assembly grease (for that price, should have) and no stickers...


  • Familiarity: I've put it through the wringer

I ride my krampus to go everywhere and its amazing what difference this seat post makes. It makes staying on the saddle much more comfortable while climbing.

Unanswered Question

When will you have a red 31.6 in stock

When will you have a red 31.6 in stock