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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

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Old 02-25-11, 05:34 AM   #1
deepakvrao
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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.
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Old 02-25-11, 05:40 AM   #2
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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.
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Old 02-25-11, 05:41 AM   #3
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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.
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Old 02-25-11, 05:44 AM   #4
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^^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.
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Old 02-25-11, 05:44 AM   #5
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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...
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Old 02-25-11, 06:16 AM   #6
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The carbon seatpost on our tandem takes all my weight, plus the weight and twisitng of the stoker's hands. You'll be ok.

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Old 02-25-11, 06:38 AM   #7
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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.
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Old 02-25-11, 08:11 AM   #8
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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.
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Old 02-25-11, 08:42 AM   #9
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You'll be fine. Just use what you've ordered and don't worry about it. Carbon is much stronger than many people realize.
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Old 02-25-11, 08:52 AM   #10
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Quote:
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?
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Old 02-25-11, 09:03 AM   #11
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^ 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.
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Old 02-25-11, 11:48 AM   #12
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It's reasonable OP...people are afraid "this" might happen:











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Old 02-25-11, 11:52 AM   #13
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Or this...







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Old 02-25-11, 11:56 AM   #14
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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....
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Old 02-25-11, 12:11 PM   #15
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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)
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Old 02-25-11, 12:29 PM   #16
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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.
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Old 02-25-11, 01:18 PM   #17
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Eat less, ride more, lose weight.

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Or this...

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Old 02-25-11, 01:43 PM   #18
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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.
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Old 02-25-11, 02:08 PM   #19
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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.
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Old 02-25-11, 02:34 PM   #20
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Looks like it had the **** tightened out of it.
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Old 02-25-11, 07:36 PM   #21
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Quote:
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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.
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Old 02-25-11, 07:39 PM   #22
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I think I'm gonna use the CF and stop worrying about it. I hope :-)
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Old 02-25-11, 07:41 PM   #23
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I think I'm gonna use the CF and stop worrying about it. I hope :-)
You're fine. Not to worry.
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Old 02-25-11, 07:42 PM   #24
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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.
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Old 02-25-11, 08:11 PM   #25
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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.)
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