Comfort and efficiency.

The Syntace P6 Carbon HiFlex is designed to gently dampen road vibrations so you can be more efficient while pedaling. To increase comfort while still limiting sideways movement, Syntace designed the seatpost with the ability to flex backward under load. Syntace did this by meticulously arranging the carbon fiber structure. The HiFlex also features an integrated carbon head. The cold-forged alloy (7075) lower rail plates, and deep-head titanium bolts, offer 30 degrees of saddle tilt and maximum rail support.

  • Integrated carbon head
  • Cold-forged alloy (7075) lower rail plates and deep-head titanium bolts
  • 30 degrees of saddle tilt
  • Reviews
  • Q & A

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?

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?

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

No 27.2?

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