Carbon question.
- Mulger bill
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Carbon question.
Postby Mulger bill » Sun Sep 16, 2007 9:00 pm
Anyway, take a look at this...
The marks are from the saddlebag rubbing the post, the top one shown seems to be very minor, more a surface blemish. The othere one is the worry, I can feel a definite, if small groove when running a thumbnail over the post.
Is this worth worrying about? Is there a new post on the immediate horizon? Do red bikes go faster? I've since slid a length of old tube onto the post to sit between the bag and post and crossed fingers.
Shaun.
not wanting another round of plastic/beercan badinage, can we stick to the component in question thanks
Oh yeah, theres about a quarter mile of post inside the frame. Bearing in mind insertion limits, would there be any dramas in taking a hacksaw to the last 70mm of post?
Thanks
Shaun
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- toolonglegs
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Postby toolonglegs » Sun Sep 16, 2007 9:19 pm
But you do have to be careful all the same with carbon,I kid you not but I have to take the rubber nipples off my new maxxis tyres as they CUT thru my front forks if I dont....but I havent replaced them!
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Postby europa » Sun Sep 16, 2007 9:30 pm
As mentioned by others, the big problem with carbon is the knock that's heavy enough to start a fracture, with nothing being visible (the old starting from the inside out routine).
Live with the thing, though you are right to prevent further damage. Ride happy and if it bothers you, put an ally post in - it'll cost you a poofteenth of a millenothing up every hill you climb but some of us are happy to live with that.
Richard
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Postby toolonglegs » Sun Sep 16, 2007 9:31 pm
I have an alloy post....but steel forks....OMGoshMountGower wrote:From what I have read here and elsewhere, this sudden failure bizzo is usually an inside out job. I'm not sure small rub marks have been accused of anything that I've read about. I'd be more worried if the bike fell over and hit the seat post.
For me, I am obviously one of the more anti corbon people you will ever meet so you should bare that in mind when I say that I trust carbon seat posts and forks less than I trust the frames for reasons that won't boggle the mind too much.
I think if you trust carbon fibre you need to dismiss what people say against it and go with those feelings. If what you have read or seen lately is causing you preoccupation while you are riding, get rid of it. I have an aluminium seat post and steel forks. Somehow the blokes who had no choice seemed to put up with it, if indeed putting up with something that just isn't a problem is the right choice of words.
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Postby triode12 » Sun Sep 16, 2007 9:43 pm
Check the inside of the tube to see if this is the case.
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Postby triode12 » Sun Sep 16, 2007 9:44 pm
Lugged steel forks can be as or more comfortable as carbon ones.toolonglegs wrote:I have an alloy post....but steel forks....OMGoshMountGower wrote:From what I have read here and elsewhere, this sudden failure bizzo is usually an inside out job. I'm not sure small rub marks have been accused of anything that I've read about. I'd be more worried if the bike fell over and hit the seat post.
For me, I am obviously one of the more anti corbon people you will ever meet so you should bare that in mind when I say that I trust carbon seat posts and forks less than I trust the frames for reasons that won't boggle the mind too much.
I think if you trust carbon fibre you need to dismiss what people say against it and go with those feelings. If what you have read or seen lately is causing you preoccupation while you are riding, get rid of it. I have an aluminium seat post and steel forks. Somehow the blokes who had no choice seemed to put up with it, if indeed putting up with something that just isn't a problem is the right choice of words.
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Postby europa » Sun Sep 16, 2007 9:59 pm
Taking this far more seriously that you probably intended (hey, this is a forum, it's traditional ), but I'd have thought that would be the wrong move. A carbon seatpost is designed to work as a tube and so, filling the gut with timber would remove its ability to flex and lead to some other form of failure ... wouldn't it?ggundersen wrote:I can remember in the old days fixing bikes that had a wooden stick jammed in their steel forks - just in case the forks should snap. I surpose if your paranoid you could do the same with your seat post?????
Richard
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Postby toolonglegs » Mon Sep 17, 2007 5:53 am
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Postby Mulger bill » Mon Sep 17, 2007 7:26 pm
Yeah, heard about that scam, 'tis all good.triode12 wrote:More often than not, these "carbon" seat posts are really aluminium posts with a carbon outer wrap. i.e. The carbon is there only for cosmetic reasons.
Check the inside of the tube to see if this is the case.
Think I'll keep going as is and keep a very close eye on it. Gonna be an awkward riding position, but what the...
Shaun
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Postby Bnej » Mon Sep 17, 2007 8:11 pm
But it's probably just surface damage and nothing to worry about. If these things could be destroyed by a seat bag it'd be happening all the time.
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Postby toolonglegs » Mon Sep 17, 2007 10:44 pm
It is on cycling news...eorbike wrap up part 10 ...i love toys,wish i had the money to fund my habit!.gsxrboy wrote:Do you have any more info on that bike longlegs? I can't fid a page anywhere for some reasons! just for interests sake. Cheers
http://www.cyclingnews.com/tech/2007/sh ... robike0710
- europa
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Postby toolonglegs » Mon Sep 17, 2007 10:50 pm
mmmm...tell me something I don't know!!! I only want 3 mtb's...super light hard tail,light xcountry dualie and a down hiller,2 track bikes...sprint and tt,plus a road tt bike,I actually have the road bike I want but a set of zipp 440 clydesdale's wouldn't go a miss,oh I also like my training bike....europa wrote:You'll never have enough money - the habit just gets bigger to compensatetoolonglegs wrote:.i love toys,wish i had the money to fund my habit!.
Richard
going to bed to dream of unrealistic things
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Postby inaminit » Mon Sep 17, 2007 11:06 pm
Do red bikes go faster?
Of course they do, at least I hope they do as I own 2 of them
08 Avanti Quantum Team
LeMond Tourmalet
Giant Kronos
Trek 4300 MTB
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Postby triode12 » Wed Sep 19, 2007 9:59 am
http://www.news.com.au/travel/story/0,2 ... 77,00.html
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Postby europa » Wed Sep 19, 2007 11:00 am
Maybe they shouldn't go crashing themtriode12 wrote:A former Boeing engineer says that Carbon shatters on impact and should not be used on the new 787.
http://www.news.com.au/travel/story/0,2 ... 77,00.html
Interesting story though.
Richard
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Postby mikesbytes » Wed Sep 19, 2007 12:06 pm
Jokes aside, it seems that while CF is the strongest readily avail material, when it does break it tends to shatter. I've not had a single problem with the carbon forks and seat post I've got.
My conclusion on CF is that you should buy good quality CF components. Like any material there is the good the bad and the ugly.
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Postby europa » Wed Sep 19, 2007 12:11 pm
Spot on mate - cf has its place. We tend to forget that when we say 'steel' we mean good steel, not the old water pipe jobs and bad TIG welding can produce weak joints in steel frames.mikesbytes wrote:So I shouldn't have a CF bike because it wouldn't survive a lighting strike.
Jokes aside, it seems that while CF is the strongest readily avail material, when it does break it tends to shatter. I've not had a single problem with the carbon forks and seat post I've got.
My conclusion on CF is that you should buy good quality CF components. Like any material there is the good the bad and the ugly.
To be honest, if lightening took me out, the last thing I'd be thinking about would be the bike. Wonder what a lightening bolt would do to a steel frame. Surely it wouldn't be good for it - messing up the temper and stuff like that. Any engineers here willing to hazard a guess?
Richard
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Postby Aushiker » Wed Sep 19, 2007 12:29 pm
I have been in an Airbus 330 which was struck by lightening (my last flight out of Singapore). Bloody loud bang for sure. No idea about the carbon content but.mikesbytes wrote:So I shouldn't have a CF bike because it wouldn't survive a lighting strike.
Andrew
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Postby triode12 » Wed Sep 19, 2007 1:34 pm
You might own a well built frame, but if the inherent characteristic of the material is to shatter on impact, one cannot be certain how and when it will fail (if it does at all) after the frame has suffered a hit from a crash or fall.
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