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Carbon Seat Post - Big Difference??

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Carbon Seat Post - Big Difference??

Old 07-28-14, 12:00 PM
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rangerfan
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Carbon Seat Post - Big Difference??

Thinking about upgrading my alloy seatpost to carbon. Bike is aluminum frame. How would this potentially effect the ride. I know the carbon would be slightly lighter.

For those who have experience, what difference have you noticed?
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Old 07-28-14, 12:05 PM
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I haven't made the switch on an aluminum frame but I have on steel. I couldn't tell any difference at all.
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Old 07-28-14, 12:12 PM
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Same for me, I did it on my aluminum frame and the only difference I noticed was how much lighter my wallet was.
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Old 07-28-14, 12:13 PM
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Not necessarily lighter at all. See the Thomson Masterpiece. It is hard to find a CF post as light as that anymore. I feel no difference between the two.
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Old 07-28-14, 12:17 PM
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Velonews did a test, and there is a measurable difference between various seatposts.




In my experience the damping from a seat post may depend as much or more on design (for example setback, or lack thereof), diameter, and amount of post exposed, than material (cf or al).

I changed an aluminum Dura Ace post out for a CF K force, with maybe 180mm of post exposed and noticed no ride difference. (and the K force was heavier)

I put a 400mm 27.2 Race Face CF post on my MTB with about 350mm of post exposed, and I believe I can feel some damping benefit.
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Old 07-28-14, 12:19 PM
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Has anyone tried the cobble gobbl-r post?? Looks interesting. Not sure if it's legit or just marketing.
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Old 07-28-14, 12:21 PM
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over my straight alloy post, there's some damping from a FSA k-force
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Old 07-28-14, 12:22 PM
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Originally Posted by merlinextraligh View Post
Velonews did a test, and there is a measurable difference between various seatposts.

And how much difference does that make when the frame, fork, wheels, and especially tires are also part of the system and absorbing vibration?

Not much, if it's even discernible at all.
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Old 07-28-14, 12:23 PM
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Originally Posted by datlas View Post
Has anyone tried the cobble gobbl-r post?? Looks interesting. Not sure if it's legit or just marketing.
I have it on my CAAD10 and it's quite noticeable. They've shortened the name to CG-R now I think...
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Old 07-28-14, 12:41 PM
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I wrapped my old aluminum post (I think it came off a Huffy or something) with carbon fiber tape and I'd swear it gives me a smoother ride with less vibration.
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Old 07-28-14, 01:00 PM
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Originally Posted by achoo View Post
And how much difference does that make when the frame, fork, wheels, and especially tires are also part of the system and absorbing vibration?

Not much, if it's even discernible at all.
I'm pretty sure I can tell the difference between .5 g's and 1.353 g's being applied to my ass.


If you look at the test protocol, they accounted for frame, fork, wheels and tires, running the bike on a roller with a 1/4" ridge, simulating a bumpy road.

https://velonews.competitor.com/2012/...-post_267560/2

Tire pressure of 120PSI was used. Obviously if you dropped the pressure, you'd get a suspension effect there, and reduce the G forces transmitted to your ass, but I doubt the relative difference between the various posts would differ much.

OP's question wasn't whether you can reduce the forces absorbed by your ass by different wheels, tires, forks, tire pressure, etc. It was does a CF seatpost make a difference, and the data says it can, depending on which post we're talking about.
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Old 07-28-14, 01:05 PM
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I quite like my s-works pave. Then again I haven't had an alu post in my road bike for a long time so I can't really tell a difference.
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Old 07-28-14, 01:06 PM
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Originally Posted by wphamilton View Post
I wrapped my old aluminum post (I think it came off a Huffy or something) with carbon fiber tape and I'd swear it gives me a smoother ride with less vibration.
But did it make you faster?
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Old 07-28-14, 01:13 PM
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Originally Posted by snidely View Post
But did it make you faster?
Alas, nothing makes me faster
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Old 07-28-14, 01:13 PM
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Originally Posted by wphamilton View Post
I wrapped my old aluminum post (I think it came off a Huffy or something) with carbon fiber tape and I'd swear it gives me a smoother ride with less vibration.
Take the post back off and stuff carbon fiber tape in the bottom. it will DOUBLE the dampening.
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Old 07-28-14, 09:08 PM
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I noticed quite a difference. I went from a carbon-wrapped aluminum post on my Cannonade Six 6 (aluminum with carbon rear triangle) to the lightest china-made carbon post I could find on eBay. Definitely noticed a smoother ride, but this could be entirely due to the lack of material in the new post... not that I'm riding a noodle, but if I had to guess I'd chalk up the difference to the weight rather than the material.
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Old 07-28-14, 09:15 PM
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haven't noticed any ride difference between my several alloy posts and inexpensive ebay china CF posts. but i like the fact that they are lighter. now, my new CF frame has a loooong CF seatmast on it and it does absorb a noticeable amount of lateral movement. i don't know if that's all good or not yet. we'll see.
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Old 07-29-14, 05:34 AM
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I too went the Chinese route. The aluminum post on my vintage bike developed a crack. Couldn't find a direct replacement (nothing special or exotic, just looking for sonething close to keep the vintage look) even at the co-op or junk drawers in the LBS's. Only thing I've noticed is the new has zero setback unlke the slight setback on the old post. A little more comfortable given the different seat position. Other than that, nothing noticeable. On my MTB though, I did notice a little damping over the aluminum post it replaced (Chinese as well though a little higher quality than the road bike.) That might be an apples/apricots comparison though since the MTB will jarr a lot more than the roadie.
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Old 07-29-14, 05:43 AM
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It won't make you faster, unless your old seatpost weighs a kilo.Carbon seatposts are more comfortable than Aluminium ones.
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Old 07-29-14, 04:01 PM
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Originally Posted by achoo View Post
And how much difference does that make when the frame, fork, wheels, and especially tires are also part of the system and absorbing vibration?

Not much, if it's even discernible at all.
I'm not sure I believe that graph. The Ti Moots Setback is right next to the Thomson AL post. On my bike, I replaced an AL seatpost with a Moots Ti setback. The Moots Ti post flexed/bent so much that I actually bobbed up and down while pedaling. I went back to my old post.

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Old 07-29-14, 05:42 PM
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Originally Posted by datlas View Post
Has anyone tried the cobble gobbl-r post?? Looks interesting. Not sure if it's legit or just marketing.
Yes. I own one.

Yes. It make s a BIG difference over the stock carbon seatpost my Tarmac came with. Really "shuts up" the road noise on the bum. Possibly I'm not a strong enough rider, but I do not feel it actually flexing or bending...but the smooth ride is definitely there.

Of the many things I've bought for my bike...some have been worth it, some not so much. The CG-R is 100% worth the $$.

Oh...and to the "single mount point sucks" guys...2000 miles on the correctly torqued saddle and not a mm of movement. I marked the saddle position on the seat post when I had my fit...zero movement.
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