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Is anybody using the Syntace P6 Hiflex seatpost?

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Cyclocross and Gravelbiking (Recreational) This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like : "Unbround Gravel". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

Is anybody using the Syntace P6 Hiflex seatpost?

Old 07-12-20, 07:33 AM
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biketampa
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Is anybody using the Syntace P6 Hiflex seatpost?

I havenít found a large variety of reviews especially on forums relating to the syntace p6. My bike came with a fsa sl-k Carbon fiber 0mm offset seatpost. Iím looking for a seatpost to mainly take some of the edge off some of the road vibrations as on longer rides that can take a big toll on my lower back.

I tried the redshift shockstop post. I thought it was good but with itís offset (which is admittedly not much. 8mm I think) it doesnít quite work with my bike fit. It puts the clamp at the very back of the saddle rails.

I currently am trying the thudbuster st. That has a 0mm offset but itís ugly, very heavy, and cramming a light and saddle bag there is less than ideal. It works and I may end up keeping it.

that leads me to think about the syntace p6. Has anybody used that on their gravel bike? How much flex is their? Enough to make a difference
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Old 07-12-20, 04:41 PM
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Originally Posted by biketampa View Post
I havenít found a large variety of reviews especially on forums relating to the syntace p6. My bike came with a fsa sl-k Carbon fiber 0mm offset seatpost. Iím looking for a seatpost to mainly take some of the edge off some of the road vibrations as on longer rides that can take a big toll on my lower back.

I tried the redshift shockstop post. I thought it was good but with itís offset (which is admittedly not much. 8mm I think) it doesnít quite work with my bike fit. It puts the clamp at the very back of the saddle rails.

I currently am trying the thudbuster st. That has a 0mm offset but itís ugly, very heavy, and cramming a light and saddle bag there is less than ideal. It works and I may end up keeping it.

that leads me to think about the syntace p6. Has anybody used that on their gravel bike? How much flex is their? Enough to make a difference
I have owned both ST and LT thudbuster post each great bug too much for my gravel bike. I seek just some flex frame is beast still unforgiving old school design before comfort was a thing..
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Old 07-12-20, 06:58 PM
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I have been using the RedShift and it is great. Is having it at the back of the seat rails that big of a problem? I find setting it at 5 pounds over my weight eliminates bob and keeps it at just dampening the big hits. The Thudbuster works but it is a dinosaur compared the the elegant RedShift!
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Old 07-13-20, 07:21 AM
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Originally Posted by dwmckee View Post
I have been using the RedShift and it is great. Is having it at the back of the seat rails that big of a problem? I find setting it at 5 pounds over my weight eliminates bob and keeps it at just dampening the big hits. The Thudbuster works but it is a dinosaur compared the the elegant RedShift!
I wouldnít say itís THAT big a problem. But I donít like have to compromise the fit of my bike to accommodate a component. Part of the problem is that with it pushed to the back of the rails Iím barely able to get it in the position where the saddle nose to handle bars measurements match my fit. And in theory redshift recommends 5mm more forward. Thatís not set in stone just their guideline. I donít like having any wiggle room. Basically it comes down to the redshift has a slight offset, wanting to push it a few mm more forward, and the redshift rail clamp is slightly longer so Iím losing a fair amount of saddle rail. Not the end of the world but I feel like for long gravel rides my bike fit becomes more important.
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Old 07-13-20, 07:51 AM
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Originally Posted by dwmckee View Post
I have been using the RedShift and it is great. Is having it at the back of the seat rails that big of a problem? I find setting it at 5 pounds over my weight eliminates bob and keeps it at just dampening the big hits. The Thudbuster works but it is a dinosaur compared the the elegant RedShift!

hmm. Now Iím considering the pnw coast dropper suspension post. I donít actually need to the dropper part. But itís zero offset and has suspension.
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Old 07-13-20, 11:04 AM
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I have one. The niner RDO is the same seatpost and there's a lab test video showing that it flexes up to 8mm vs 4mm for a regular carbon post
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Old 07-13-20, 12:39 PM
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Originally Posted by Elvo View Post
I have one. The niner RDO is the same seatpost and there's a lab test video showing that it flexes up to 8mm vs 4mm for a regular carbon post
interesting. thanks. It's tempting for sure as I feel like a little reduction in vibration through to my back makes a big difference on a long gravel ride.
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Old 07-13-20, 02:06 PM
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Is this it? I don’t see anything on their site that claims amount of travel. How is it different from other carbon seatposts?


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Old 07-13-20, 07:33 PM
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Originally Posted by Wilbur76 View Post
Is this it? I donít see anything on their site that claims amount of travel. How is it different from other carbon seatposts?


my understanding is itís in how the carbon fibers are layered allowing a bit of flex when riding on rough roads/gravel/bumps. itís been around for years. I donít know if theyíve made improvements. I donít know if they make specific claims about the amount of flex give. It will vary based on rider weight, how far the seatpost is down in seattube, etc. I actually road one like 5 years ago and the bike it was on was super comfortable. I had a bike fit done and the fitter was making adjustments to my bike and asked if I wanted to take his bike for a spin. It was a bianchi road bike with tubular tires, and it had the syntace seat post. It was very comfortable. He swore by the syntace seatpost. So it seemed to work for him. My bike is pretty comfortable but no matter how comfortable when you get into those really long gravel rides the rough stuff takes itís toll on your body. For me, especially my lower back. But I also need to change my tires to tubeless and lower the psi a bit.
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Old 07-13-20, 09:43 PM
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This is what you're looking for https://www.ergonbike.com/en/product...=43000025&s=cf
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