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P6 Carbon HiFlex Seatpost

4.4 out of 5 stars 29 ratings
Currently unavailable.
We don't know when or if this item will be back in stock.
Color Black
Material Carbon Fiber
Brand Syntace
Bike Type Mountain Bike
Manufacturer Syntace

About this item

  • Claimed Weight: [27.2] 231 g, [30.9] 220 g, [31.6] 220 g, [34.9] 238 g
  • Diameter: 27.2 mm, 30.9 mm, 31.6 mm, 34.9 mm
  • Length: [27.2] 400 mm, [30.9] 300 mm, [30.9] 400 mm, [31.6] 300 mm, [31.6] 400 mm, [34.9] 480 mm
  • Material: carbon fiber
  • Recommended Use: road cycling, mountain biking
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Product Description

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.

Product information

Technical Details

Global Trade Identification Number ‎04051731104082
Item Package Dimensions L x W x H ‎19.3 x 2.6 x 2.2 inches
Package Weight ‎7.2 ounces
Item Dimensions LxWxH ‎21 x 4 x 3 inches
Brand Name ‎Syntace
Part Number ‎104082
Model Year ‎2015
Size ‎34.9/480mm

Additional Information

ASIN B006HPXED2
Customer Reviews
4.4 out of 5 stars 29 ratings

4.4 out of 5 stars
Best Sellers Rank #1,057,529 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
#1,201 in Bike Seat Posts
Date First Available August 9, 2013

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Syntace P6 Carbon HiFlex Seatpost

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Customer reviews

4.4 out of 5 stars
29 global ratings

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Customers say

Customers find the seatpost well-made and solidly mounted, appreciating its light weight and comfortable ride that makes the ride smoother. They like its quality and consider it worth the money, with one customer noting it offers good flex distribution.

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7 customers mention "Build quality"7 positive0 negative

Customers appreciate the build quality of the seatpost, describing it as well made with a solid mount.

"excellent seat post. Light and has a very solid mount. no noise so far. highly recommend" Read more

"I have a few of these posts and love them. They are well made and take the edge off of bumps on a hard tail bike...." Read more

"...It feels totally stiff and solid. So, if you are looking for something like a Thudbuster, then you better look for a Thudbuster...." Read more

"...I am 210 pounds and I like to ride bikes hard. With the german quality Syntace HiFlex, the overall flex is much more distributed...." Read more

5 customers mention "Weight"5 positive0 negative

Customers appreciate the weight of the seatpost, describing it as light.

"excellent seat post. Light and has a very solid mount. no noise so far. highly recommend" Read more

"...If you want a light carbon seatpost that takes some of the shock out of bumps, then this might be for you...." Read more

"...It is fairly light, but mostly 'tough' works well with carbon railed saddles (some seat posts do not), has a long and..." Read more

"It does absorb some heavy bumps on mountain trails. Light and no surprises." Read more

4 customers mention "Comfort"4 positive0 negative

Customers find the seatpost comfortable and note that it provides a smoother ride.

"...Did it make me any faster? Probably not, but the ride is a bit smoother." Read more

"...I am using it on a carbon fiber hardtail 29er and the ride is noticeably smoother." Read more

"Confortable post..." Read more

"Notable comfort difference..." Read more

3 customers mention "Flex distribution"3 positive0 negative

Customers appreciate the seatpost's flex distribution.

"...Well, the truth is in-between, its flex is subtle. If you hold it in your hand, you wouldn't know it is supposed to be a flexing post...." Read more

"...With the german quality Syntace HiFlex, the overall flex is much more distributed. Did it make me any faster?..." Read more

"Does what it says flexes a good amount to reduce impact... 10 year warranty! Night and day difference from my aluminum post!" Read more

3 customers mention "Seat post quality"3 positive0 negative

Customers find the seat post excellent.

"excellent seat post. Light and has a very solid mount. no noise so far. highly recommend" Read more

"Great Seat Post!..." Read more

"Best seat post!..." Read more

3 customers mention "Value for money"3 positive0 negative

Customers find the seatpost worth the money.

"...road terrain -- to learn that this purchase was most definitely worth the cost...." Read more

"...I was worth it, It took the edge off the typical harsh ride that is inherent of a ardtail." Read more

"...Yes, it's worth the money." Read more

Top reviews from the United States

  • Peter Zouboulakis
    5.0 out of 5 stars Very high quality product
    Reviewed in the United States on August 21, 2016
    Verified Purchase
    excellent seat post. Light and has a very solid mount. no noise so far. highly recommend
    Helpful
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  • Jeff
    5.0 out of 5 stars Confortable post
    Reviewed in the United States on August 6, 2013
    Verified Purchase
    I have a few of these posts and love them. They are well made and take the edge off of bumps on a hard tail bike. The post improves the ride more than a few 27.2mm Ti posts I have used from Moots and others.
    4 people found this helpful
    Helpful
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  • Paul Doland
    3.0 out of 5 stars Keep your expectations in check!
    Reviewed in the United States on December 3, 2017
    Verified Purchase
    Some reviews make it sound like this thing will flex like a Thudbuster. On the other hand, another reviewer said it is all a scam and it doesn't flex at all. Well, the truth is in-between, its flex is subtle. If you hold it in your hand, you wouldn't know it is supposed to be a flexing post. It feels totally stiff and solid. So, if you are looking for something like a Thudbuster, then you better look for a Thudbuster. If you want a light carbon seatpost that takes some of the shock out of bumps, then this might be for you.

    It fit REALLY tight in my bike's tube, a Trek aluminum bike. I used some Park Tool assembly compound. I had to put my seat on the post so that I could then use the seat for leverage to twist and push to get the post inserted! Someone I think said they had problems with their bike tube scratching the seatpost because it was so tight and recommended putting a chamfered edge on the tube. But my bike already had that from the factory and I didn't have any scratching problems. But it sure was tight!

    I like the seat angle adjustment mechanism. Seems to work well. It is a solid post. It is light. It works. It doesn't do miracles though.
    10 people found this helpful
    Helpful
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  • Michael B.
    4.0 out of 5 stars Simple, effective construction. Offers a bit more flex than your traditional 31.6 seat post.
    Reviewed in the United States on April 26, 2014
    Verified Purchase
    Okay, I've ridden this seat post now for about 500 miles on a fully rigid carbon bike. It weighs exactly the same as my aluminum Thompson Elite and it is heavier than a Thompson Masterpiece. The only reason I went to this seat post is because I felt that the stiffer aluminum seat posts were making my frame flex too much in the middle of the seat tube area. I am 210 pounds and I like to ride bikes hard. With the german quality Syntace HiFlex, the overall flex is much more distributed. Did it make me any faster? Probably not, but the ride is a bit smoother.
    4 people found this helpful
    Helpful
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  • Gear Curmudgeon
    1.0 out of 5 stars NoFlex
    Reviewed in the United States on September 3, 2015
    The Syntace P6 Carbon HiFlex is a good seatpost, but it does not deflect at all as far as I can tell.
    I swapped from a Zipp Service Course aluminum seat post to the HiFlex and did not noticed any difference at all in ride quality.
    Also if I stand next to my bike and put all my weight on it, there is no detectable deflection at all, even if I bounce. That is with the seatpost fully extended. It is a good, lightweight seatpost, and I know Syntace is a very reputable company, but it just doesn't live up to Syntace's claims.
    2 people found this helpful
    Helpful
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  • Jelier J. Dorst
    5.0 out of 5 stars Great Seat Post!
    Reviewed in the United States on February 22, 2013
    Verified Purchase
    This is my second Syntace Full Carbon P6 Hi-Flex Seat Post.
    It is fairly light, but mostly 'tough' works well with carbon railed saddles (some seat posts do not), has a long and
    supportive clamp design that has a lot of adjustment.
    The flex (combined with a light carbon-railed saddle) works well (as long as you have several inches of seat-post
    above the seat tube clamp) work well and you can feel it. I use a version on my non-suspension 'fat-tired' bike, and
    my high-end Moots RSL road bike.
    5 people found this helpful
    Helpful
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  • Brian
    5.0 out of 5 stars Notable comfort difference
    Reviewed in the United States on July 13, 2020
    Verified Purchase
    As as avid cyclist, I once thought that wasting money on a carbon seat post (for a carbon bike) was one of the silliest things a cyclist could do.

    Only took one 40 mile ride -- on variable road terrain -- to learn that this purchase was most definitely worth the cost.

    No question there is far less road vibration transmitted through my new carbon seat post versus my handlebars.
    2 people found this helpful
    Helpful
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  • phillip turino
    5.0 out of 5 stars Great compliance and shock absorption
    Reviewed in the United States on September 18, 2019
    Verified Purchase
    Also, clever saddle angle adjustment, helps to fine-tune saddle angle. Overall, a well thought out and well built seat post.
    Helpful
     Report

Product Summary: Syntace P6 Carbon HiFlex Seatpost

From Syntace

4.4 out of 5 stars, 29 ratings

Customer reviews

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About this Item

  • Claimed Weight: [27.2] 231 g, [30.9] 220 g, [31.6] 220 g, [34.9] 238 g
  • Diameter: 27.2 mm, 30.9 mm, 31.6 mm, 34.9 mm
  • Length: [27.2] 400 mm, [30.9] 300 mm, [30.9] 400 mm, [31.6] 300 mm, [31.6] 400 mm, [34.9] 480 mm
  • Material: carbon fiber
  • Recommended Use: road cycling, mountain biking

Product Description

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.
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