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  • Syntace P6 Carbon HiFlex
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SyntaceP6 Carbon HiFlex
Sale 32% Off$182.92 - $203.52

Item # SYN000A

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  • One Color, 27.2/400mm ($203.52)
  • One Color, 31.6/400mm ($182.92)
  • One Color, 30.9/400mm ($185.41)
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Item # SYN000A

Smoothing the ruts.

Syntace's P6 Carbon HiFlex is not a shock absorbing seatpost. It is a carbon seatpost that is designed to gently dampen the effects of rough roads or rutted trails, which, in turn, lets you focus on using your legs to put power to the pedals.

For the P6, Syntace arranged carbon fibers in such a manner that the seatpost is able to flex backwards under load, which increases a rider's comfort without any sideways movement. The benefit is that the post takes the edge off of the bumps on your road bike. If you're on your mountain bike, conventional seatposts and saddles force you to lift your weight slightly from the perch to minimize bumps. This means you're hovering instead of standing or sitting, which is a tiring position to ride in. Using the P6 HiFlex, however, you're able to remain seated over ruts in the trail, letting your legs push the pedals rather than holding you off the saddle.

The HiFlex also features an integrated carbon head. It uses cold-forged alloy (7075) lower rail plates and deep-head titanium bolts to give 30 degrees of saddle tilt, plus maximum rail support.

The Syntace P6 Carbon HiFlex is available in the sizes 27.2/400mm, 30.9/300mm, 30.9/400mm, 31.6/300mm, 31.6/400mm, and 34.9/480mm.

  • Integrated carbon head
  • Cold-forged alloy (7075) lower rail plates and deep-head titanium bolts
  • 30 degrees of saddle tilt
Tech SpecsWeight
Tech Specs
carbon fiber
27.2 mm, 30.9 mm, 31.6 mm, 34.9 mm
[27.2] 400 mm, [30.9] 300 mm, [30.9] 400 mm, [31.6] 300 mm, [31.6] 400 mm, [34.9] 480 mm
Manufacturer Warranty
1 year
Recommended Use
mountain, road

Actual Weight

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

Have questions? Chat with a Gearhead



One Color, 27.2/400mm
One Color, 31.6/400mm
One Color, 30.9/400mm

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead

[27.2] 231 g, [30.9] 220 g, [31.6] 220 g, [34.9] 238 g

Reviews & Community


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Perfect Hardtail Companion

  • Familiarity: I've used it several times

I was a little bit skeptical about the claimed "absorption" of this post, but it did not disappoint me!

Out of the package you can tell that the quality of this post is up to any carbon post on the market. I paired this post of with an Selle SMP Dynamic saddle and the body appreciates the added comfort from both saddle and post.

I would highly recommend this post to anyone doing some gravel riding, to XC riding.

If you have questions about this post or other brands feel free to reach out to me.

Perfect Hardtail Companion

A truly great seatpost

  • Familiarity: I've put it through the wringer

There is no mistaking this seat post for anything other than what it is: a lightweight carbon fiber post. There is also no mistaking the significant flex and compliance that you can see and feel when riding. I ride a 29

Carbon Fiber At Its Best

  • Familiarity: I've used it several times

Carbon fiber has gained traction in the bike industry because of its stiffness to weight ratio and wide variety of different applications. This seatpost is a perfect example of how carbon fiber can be engineered to be effective in a multitude of different ways.

The post feels solid, but flexes a bit to provide some compliance. This technology would likely work just as well on a road bike, but I have it on my full suspension MTB and it seems to take quite a bit of sting out of the ride. If you're looking for a post that cuts some of the roughness out of your ride, the search stops here.

Get in touch with me if you have any questions about this post or what you'd use it for/if it would be appropriate for your custom build.

How much of the post needs to be exposed in order to get the full benefit of chatter reduction?

Will this post fit with my fizik arione 00 saddle, which has 7x9 Carbon rails? Thank you.

Hey John, yes, this will work. It uses clamps on top and bottom of the rails (not on the sides) so it isn't rail size specific. It will accommodate round rails, as well, should you decide to switch down the road. Send over an email to if you have more questions.

Unanswered Question

Wondering if there's much merit to this seatpost on a full squishy. I have the 2015 Epic S-Works, with the brain front & back. Brain recognizes the big stuff, but is supposed to act like an HT when the terrain doesn't require the shock to engage. Hence the question - any known users of this seatpost find benefit on their full squishies?

Avg. ride time: 3h 45m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Is the 30.9 seatpost compatible with an internal seatpost di2 battery?

Thank you. If I am installing this on my titanium frame, do I need to use any lube/silicone spray/carbon paste?

Avg. ride time: 16h 27m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Works as advertised--comfy

  • Familiarity: I've put it through the wringer

I replaced an aluminum Deda seatpost with this one. The post has an asymmetrical carbon layup (see photo) that creates a smooth shock absorbing characteristic without robbing you of power. I use this post on my Seven cross bike for my daily commute (35 miles). Truly sensational piece of gear.

Works as advertised--comfy
Avg. ride time: 4h 7m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

No 27.2?

According to the description, 27.2 400mm is available. I just took delivery of one from Competitive Cyclist yesterday.