Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

Carbon for seat post and stem?

Notices
Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Carbon for seat post and stem?

Old 02-25-11, 05:34 AM
  #1  
deepakvrao
Senior Member
Thread Starter
 
deepakvrao's Avatar
 
Join Date: Nov 2008
Location: Bangalore India
Posts: 2,385
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 391 Post(s)
Liked 17 Times in 11 Posts
Carbon for seat post and stem?

Hi Guys,

As usual like most BF posters, did the research after placing the order, and the order has been shipped. Cant return the order either.

So, reading archived posts here show that many do NOT trust CF for stems and posts? BUT lots of those posts are 2005-6 etc. Whats the current take on it?

I'm about 78kg, and just ordered a Ritchey CF post and stem and the torque wrench. Should I sack them and stick to alloy?

Logic tells me that if they use CF in airplanes, bikes are probably completely safe with CF parts but reading some stories has given me the jitters.

This is for my new build that is just getting ready.

Edit; Admitting up front that I bought them for the bling factor

Last edited by deepakvrao; 02-25-11 at 05:41 AM.
deepakvrao is offline  
Old 02-25-11, 05:40 AM
  #2  
iam7head
Senior Member
 
Join Date: Sep 2009
Posts: 219
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
You'll be fine, my fat arse been on a cf post and there's nothing happens yet.

they are not even that much lighter than good quality alloy seatpost.

as far stem: it varies, even some thin walled alloy stem will flex a bit esp if you have a lot of weight on the bar, I sold my last ritchey stem(alloy) for that reason.

right now I am running a deda stem, pretty light and very strong.
iam7head is offline  
Old 02-25-11, 05:41 AM
  #3  
rollin
Sua Ku
 
rollin's Avatar
 
Join Date: Aug 2006
Location: Hot as hell, Singapore
Posts: 5,705

Bikes: Trek 5200, BMC SLC01, BMC SSX, Specialized FSR, Holdsworth Criterium

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I weigh more than you and I use full CF bars, stem and fork with full carbon steerer on my main bike. 4 years no issue. I don't baby my bike.

I wouldn't have that on my travel bike.

I was hesitant when I first got it as part of a new build, thought I would swap it all out but it seems and feels fine. I don't own an x-ray machine (funnily enough) but I do go over things in detail when I change tape, which I probably do more than usual.

Torque wrench is your friend!

Once again Deepak - "WTF are you building?" don't leave us hanging!

Thanks for posting the build sheet.

Last edited by rollin; 02-25-11 at 05:43 AM. Reason: asked and answered.
rollin is offline  
Old 02-25-11, 05:44 AM
  #4  
deepakvrao
Senior Member
Thread Starter
 
deepakvrao's Avatar
 
Join Date: Nov 2008
Location: Bangalore India
Posts: 2,385
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 391 Post(s)
Liked 17 Times in 11 Posts
^^Hehe, replied in other post.

Planning to use this bike for travel too, but in a rigid bike case, so that should not be an issue.
deepakvrao is offline  
Old 02-25-11, 05:44 AM
  #5  
WhyFi
Senior Member
 
WhyFi's Avatar
 
Join Date: Jan 2010
Location: TC, MN
Posts: 31,524

Bikes: R3 Disc, Haanjo

Mentioned: 339 Post(s)
Tagged: 1 Thread(s)
Quoted: 14298 Post(s)
Liked 3,390 Times in 1,810 Posts
You'll be fine, there are plenty of carbon seat posts out there.

The only aversion that I have to trying a carbon stem is the price...
WhyFi is offline  
Old 02-25-11, 06:16 AM
  #6  
merlinextraligh
pan y agua
 
merlinextraligh's Avatar
 
Join Date: Aug 2005
Location: Jacksonville
Posts: 30,628

Bikes: Willier Zero 7; Merlin Extralight; Calfee Dragonfly tandem, Calfee Adventure tandem; Cervelo P2; Motebecane Ti Fly 29er; Motebecanne Phantom Cross; Schwinn Paramount Track bike

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1029 Post(s)
Liked 163 Times in 91 Posts
The carbon seatpost on our tandem takes all my weight, plus the weight and twisitng of the stoker's hands. You'll be ok.

__________________
You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.
merlinextraligh is offline  
Old 02-25-11, 06:38 AM
  #7  
zatopek
Senior Member
 
Join Date: Dec 2008
Location: Damascus, MD, USA
Posts: 1,236

Bikes: Neilpryde Nazare, Storck Scenero G3, Colnago Extreme Power, CAAD 10, Bowman Palace R, Strong Custom Foco Steel, BMC SLR01, BMC ALR01

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 68 Post(s)
Liked 61 Times in 31 Posts
On an all aluminum frame, I'll go with a Syntace P6 (CF) seat post to dampen some of the road vibrations. Otherwise, it's Thomson seat posts for me. I don't use CF stems because there are plenty of Al stems that are stronger, less prone to failure and lighter than CF. And, from an aesthetic viewpoint, I think the Deda Zero 100 stems are the bomb.
zatopek is offline  
Old 02-25-11, 08:11 AM
  #8  
Fox Farm
Senior Member
 
Fox Farm's Avatar
 
Join Date: Aug 2004
Location: Prague, Czech Republic
Posts: 2,663

Bikes: Merlin Extra Light, Orbea Orca, Ritchey Outback,Tomac Revolver Mountain Bike, Cannondale Crit 3.0 now used for time trials.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 92 Post(s)
Liked 25 Times in 17 Posts
Other than the "cool looking factor", I would stick with aluminum for the seat post and stem. Many posts here have noted nearly no noticeable difference in feel between an alloy or CF seat post. I can't comment on the stem. If you are looking for a very strong and stiff stem and post, go with a Thompson or Syncros.
Fox Farm is offline  
Old 02-25-11, 08:42 AM
  #9  
topflightpro
Senior Member
 
topflightpro's Avatar
 
Join Date: Jul 2007
Posts: 7,063
Mentioned: 54 Post(s)
Tagged: 0 Thread(s)
Quoted: 1606 Post(s)
Liked 336 Times in 232 Posts
You'll be fine. Just use what you've ordered and don't worry about it. Carbon is much stronger than many people realize.
topflightpro is offline  
Old 02-25-11, 08:52 AM
  #10  
deepakvrao
Senior Member
Thread Starter
 
deepakvrao's Avatar
 
Join Date: Nov 2008
Location: Bangalore India
Posts: 2,385
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 391 Post(s)
Liked 17 Times in 11 Posts
Originally Posted by merlinextraligh View Post
The carbon seatpost on our tandem takes all my weight, plus the weight and twisitng of the stoker's hands. You'll be ok.

Thats amazing. Thought that you could not clamp on anything to a CF post?
deepakvrao is offline  
Old 02-25-11, 09:03 AM
  #11  
merlinextraligh
pan y agua
 
merlinextraligh's Avatar
 
Join Date: Aug 2005
Location: Jacksonville
Posts: 30,628

Bikes: Willier Zero 7; Merlin Extralight; Calfee Dragonfly tandem, Calfee Adventure tandem; Cervelo P2; Motebecane Ti Fly 29er; Motebecanne Phantom Cross; Schwinn Paramount Track bike

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1029 Post(s)
Liked 163 Times in 91 Posts
^ That's the seatpost that Co-Motion specs with the bike, so they must not think it's a problem. I do try to be careful not to overtighten the stoker's stem.
__________________
You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.
merlinextraligh is offline  
Old 02-25-11, 11:48 AM
  #12  
2ndGen
CAADdict
 
2ndGen's Avatar
 
Join Date: Jul 2009
Location: BF Heaven
Posts: 6,756

Bikes: 2009 Cannondale CAAD9-?

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
It's reasonable OP...people are afraid "this" might happen:











2ndGen is offline  
Old 02-25-11, 11:52 AM
  #13  
2ndGen
CAADdict
 
2ndGen's Avatar
 
Join Date: Jul 2009
Location: BF Heaven
Posts: 6,756

Bikes: 2009 Cannondale CAAD9-?

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Or this...







2ndGen is offline  
Old 02-25-11, 11:56 AM
  #14  
WHOOOSSHHH...
Senior Member
 
WHOOOSSHHH...'s Avatar
 
Join Date: Aug 2007
Location: RVA
Posts: 6,404
Mentioned: 2 Post(s)
Tagged: 1 Thread(s)
Quoted: 24 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Cracked a couple of carbon seatposts, bent a titanium one (Lynskey is replacing for free because lifetime warranty says your allowed to be an idiot).. Morale of the story...Tighten to proper specifications....
WHOOOSSHHH... is offline  
Old 02-25-11, 12:11 PM
  #15  
RiPHRaPH
Don't Believe the Hype
 
RiPHRaPH's Avatar
 
Join Date: Feb 2002
Location: chicagoland area
Posts: 2,668

Bikes: 1999 Steelman SR525, 2002 Lightspeed Ultimate, 1988 Trek 830, 2008 Scott Addict

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The only problems I have ever had was with loosening bolts from CF on Ti which led to slipping that I couldn't solve no matter the grease type or lack of lube, lube, etc.

The bolt housing on the Easton's can break, but I've never had problems with carbon breaking (FSA and Easton)
RiPHRaPH is offline  
Old 02-25-11, 12:29 PM
  #16  
Elvo
Senior Member
 
Join Date: Oct 2006
Location: Orange County, CA
Posts: 4,483
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 494 Post(s)
Likes: 0
Liked 176 Times in 99 Posts
CF posts are usually ~$75, saving ~50g compared to aluminum.
CF stems are usually $150, saving 5-10g compared to high end aluminum. Not worth it IMO.
Elvo is offline  
Old 02-25-11, 01:18 PM
  #17  
sbxx1985
Senior Member
 
sbxx1985's Avatar
 
Join Date: Oct 2009
Location: Colorado
Posts: 12,684
Mentioned: 15 Post(s)
Tagged: 1 Thread(s)
Quoted: 1725 Post(s)
Likes: 0
Liked 150 Times in 97 Posts
Eat less, ride more, lose weight.

Originally Posted by 2ndGen View Post
Or this...

sbxx1985 is offline  
Old 02-25-11, 01:43 PM
  #18  
WhyFi
Senior Member
 
WhyFi's Avatar
 
Join Date: Jan 2010
Location: TC, MN
Posts: 31,524

Bikes: R3 Disc, Haanjo

Mentioned: 339 Post(s)
Tagged: 1 Thread(s)
Quoted: 14298 Post(s)
Liked 3,390 Times in 1,810 Posts
I just installed my new stem and handlebars with my new Park torque wrench (the $35 beam-type TW-1) - it's a thing of beauty.
WhyFi is offline  
Old 02-25-11, 02:08 PM
  #19  
pallen
Descends like a rock
 
pallen's Avatar
 
Join Date: Oct 2010
Location: Fort Worth, TX
Posts: 4,029

Bikes: Scott Foil, Surly Pacer

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Liked 3 Times in 3 Posts
What happened to that thompson stem? Did the bike go off the side of a mountain? Its cracked all over. If that's from normal use, I would suspect that its a fake. Not to say that Thompson is indestructible, but that's beyond failure.
pallen is offline  
Old 02-25-11, 02:34 PM
  #20  
WhyFi
Senior Member
 
WhyFi's Avatar
 
Join Date: Jan 2010
Location: TC, MN
Posts: 31,524

Bikes: R3 Disc, Haanjo

Mentioned: 339 Post(s)
Tagged: 1 Thread(s)
Quoted: 14298 Post(s)
Liked 3,390 Times in 1,810 Posts
Looks like it had the **** tightened out of it.
WhyFi is offline  
Old 02-25-11, 07:36 PM
  #21  
deepakvrao
Senior Member
Thread Starter
 
deepakvrao's Avatar
 
Join Date: Nov 2008
Location: Bangalore India
Posts: 2,385
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 391 Post(s)
Liked 17 Times in 11 Posts
Originally Posted by ********** View Post
CF posts are usually ~$75, saving ~50g compared to aluminum.
CF stems are usually $150, saving 5-10g compared to high end aluminum. Not worth it IMO.

Dunno about that. Paid about 170 dollars for both stem and post. Like I said in the first post, it was for the 'bling' factor.
deepakvrao is offline  
Old 02-25-11, 07:39 PM
  #22  
deepakvrao
Senior Member
Thread Starter
 
deepakvrao's Avatar
 
Join Date: Nov 2008
Location: Bangalore India
Posts: 2,385
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 391 Post(s)
Liked 17 Times in 11 Posts
I think I'm gonna use the CF and stop worrying about it. I hope :-)
deepakvrao is offline  
Old 02-25-11, 07:41 PM
  #23  
sbxx1985
Senior Member
 
sbxx1985's Avatar
 
Join Date: Oct 2009
Location: Colorado
Posts: 12,684
Mentioned: 15 Post(s)
Tagged: 1 Thread(s)
Quoted: 1725 Post(s)
Likes: 0
Liked 150 Times in 97 Posts
Originally Posted by deepakvrao View Post
I think I'm gonna use the CF and stop worrying about it. I hope :-)
You're fine. Not to worry.
sbxx1985 is offline  
Old 02-25-11, 07:42 PM
  #24  
Walter
SLJ 6/8/65-5/2/07
 
Walter's Avatar
 
Join Date: Aug 2001
Location: SE Florida, USA aka the Treasure Coast
Posts: 5,400
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Liked 17 Times in 5 Posts
Personally am not enamored of CF stems, posts and bars. If they fail you're pretty much screwed. Also good quality aluminum is frequently cheaper and weight differences are minimal.

Having said that there's alot of CF stems and etc. out there and they don't catastrophically fail on a daily basis and as for myself: I ride CF forks so my fear is not completely rational.
__________________
“Life is not one damned thing after another. Life is one damned thing over and over.”
Edna St. Vincent Millay
Walter is offline  
Old 02-25-11, 08:11 PM
  #25  
rschleicher
Retro-guy
 
Join Date: Oct 2006
Location: Danville, CA
Posts: 285

Bikes: 1980 Raleigh Super Record

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I can't speak for CF stems, since my stem is alloy. But I have a Richey Pro Carbon seatpost on my bike, and I weigh about 240 lbs. I DO try to get off the saddle for sharp bumps, etc. But in the end I worry far more about stresses to the seat tube itself, around the seat clamp area, than I worry about the post cracking or fracturing. (My bike is a Scott CR1, with a carbon frame.)
rschleicher is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.