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Author Topic: carbon seat posts  (Read 2904 times)

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Offline chainslap

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carbon seat posts
« on: October 17, 2008, 01:25:58 PM »
When it comes to handlebars, most would agree that carbon bars absorb more shock than alumimum.  That shock is absorbed from bearing weight over a horizontal run of about 10 inches of bar between the stem and one's hand.  That being said, does a carbon seat post have better dampening properties than an aluminum post?  My initial thoughts are that since the load is vertical on the tube, the material will have less effect since it should be more rigid on this axis.  Has anyone ridden the same bike/seat combo with both types of posts?

Offline Pariah

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Re: carbon seat posts
« Reply #1 on: October 17, 2008, 01:28:53 PM »
I have.  I did not notice a difference. This on my Marin F/S xc ride.
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Offline Garry

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Re: carbon seat posts
« Reply #2 on: October 17, 2008, 01:38:38 PM »
When it comes to handlebars, most would agree that carbon bars absorb more shock than alumimum.  That shock is absorbed from bearing weight over a horizontal run of about 10 inches of bar between the stem and one's hand.  That being said, does a carbon seat post have better dampening properties than an aluminum post?  My initial thoughts are that since the load is vertical on the tube, the material will have less effect since it should be more rigid on this axis.  Has anyone ridden the same bike/seat combo with both types of posts?

Actually carbon fiber is not shock absorbing but vibration dampening.  The benefit, other than weight loss, is the vibration transferred from the bike - i.e. ground (pavement), shock, frame, stem, is absorbed through the dampening qualities of the carbon fiber.  This benefits the rider in less fatigue on long rides because most of those jarring vibrations are reduced to make for a more comfortable ride.  Shock absorption is obtained through the looseness of the bodies joints (allowing oneself to flex with the motion) and the shocks on the bike.

Offline KRUNNCHERO

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Re: carbon seat posts
« Reply #3 on: October 17, 2008, 02:40:15 PM »
When it comes to handlebars, most would agree that carbon bars absorb more shock than alumimum.  That shock is absorbed from bearing weight over a horizontal run of about 10 inches of bar between the stem and one's hand.  That being said, does a carbon seat post have better dampening properties than an aluminum post?  My initial thoughts are that since the load is vertical on the tube, the material will have less effect since it should be more rigid on this axis.  Has anyone ridden the same bike/seat combo with both types of posts?

Actually carbon fiber is not shock absorbing but vibration dampening.  The benefit, other than weight loss, is the vibration transferred from the bike - i.e. ground (pavement), shock, frame, stem, is absorbed through the dampening qualities of the carbon fiber.  This benefits the rider in less fatigue on long rides because most of those jarring vibrations are reduced to make for a more comfortable ride.  Shock absorption is obtained through the looseness of the bodies joints (allowing oneself to flex with the motion) and the shocks on the bike.

On that note though, I worry. I have been reading up on the Havoc Easton Monkeylite bar and it said something to the course of not being able to work with bar ends. Meaning the clamp on handlebar grips I use, would crack the tubing. Is my finding warranted or no?
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Offline chainslap

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Re: carbon seat posts
« Reply #4 on: October 17, 2008, 02:43:14 PM »
I use clamp on grips with monkeylite xc bars with no prob, just watch your tork.

Offline KRUNNCHERO

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Re: carbon seat posts
« Reply #5 on: October 17, 2008, 03:04:06 PM »
Do you ever worry that your handlebars are going to snap off after doing a drop or perhaps after smashing into a tree because you leaned the bike too far over? I tend to smash my knuckles/grips into trees b/c I cut the corner so early.
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Offline BillT

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Re: carbon seat posts
« Reply #6 on: October 17, 2008, 03:22:43 PM »
Carbon bars are pretty sturdy, but not indestructable.  I snapped a set of Easton Monkey lite bars but I basically ran head on into a wall with my bike at about 15-20mph.  If you are doing drops, stick to aluminum, but for basic xc riding, carbon is great.

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Offline KRUNNCHERO

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Re: carbon seat posts
« Reply #7 on: October 17, 2008, 03:33:45 PM »
I bet that made things interesting when your handlebar fell off.... How was the end result of that collison?
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Offline chisel

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Re: carbon seat posts
« Reply #8 on: October 17, 2008, 04:12:52 PM »
I broke a Scott carbon bar years ago but have been riding a monkey lite xc bar for 8 years now with no problems. I did a fair share of hucking with them too.

Offline Garry

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Re: carbon seat posts
« Reply #9 on: October 17, 2008, 04:29:41 PM »
Do you ever worry that your handlebars are going to snap off after doing a drop or perhaps after smashing into a tree because you leaned the bike too far over? I tend to smash my knuckles/grips into trees b/c I cut the corner so early.

As I understand it if you break a carbon bar,then  an aluminum bar would have either been bent beyond use or broken as well.  Bar ends are not ideal for carbon bars, but can be used if torqued properly.

Offline jdk

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Re: carbon seat posts
« Reply #10 on: October 17, 2008, 04:38:53 PM »
I'm going to have to agree with Garry here. If you get into a collision bad enough to break a set of carbon bars an aluminum equivalent would have been severely damaged as well. After feeling the vibration damping difference between aluminum and carbon, even if I broke a set of carbon bars I would replace them with another set of carbon bars. The difference is very noticeable.

EDIT: I don't have anything to add to the seatpost discussion, sorry  :-\


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Offline BillT

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Re: carbon seat posts
« Reply #11 on: October 17, 2008, 05:53:19 PM »
I bet that made things interesting when your handlebar fell off.... How was the end result of that collison?


This was the result:



And this:

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Offline bikehard

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Re: carbon seat posts
« Reply #12 on: October 17, 2008, 06:48:23 PM »
BILL!!! THANKS FOR THE VISUAL!! I'M so HUNGRY NOW! ;D
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Offline jdk

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Re: carbon seat posts
« Reply #13 on: October 17, 2008, 07:02:01 PM »
I just had a beef  and  cheese quesadilla


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Offline slowfatguy

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Re: carbon seat posts
« Reply #14 on: October 17, 2008, 07:16:03 PM »
I love my carbon bars, wouldn't run anything else. I figure if I haven't broken them on my SS as hard as I pull on them they are good to go! Carbon seatpost on the otherhand, I just don't trust. I know they work for some people, but I'm pushing 230lbs, I'll keep my Thompson. ;)
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