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Old 10-02-08, 11:04 AM   #1
JonnyV
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Acceptable carbon parts?

Which, if any, parts are acceptable to have in carbon? Handlebars? Seat post? I guess there isn't too much more to offer on a mountain bike. But how do you guys feel about about carbon on a mountain bike?
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Old 10-02-08, 11:36 AM   #2
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personally I'm paranoid of carbon on my mtb bike

I do however know guys running carbon cranks and bars and even stems

I don't see much benefit to carbon on an mtb considering Thompson high end stuff weighs about the same and can handle a nick from a crash alot better

IMO if you gonna sapned te mnoey on carbon buy thompson
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Old 10-02-08, 11:43 AM   #3
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The little stuff like frames, bars, cranks, wheels, fork sliders . . . shouldn't be a big concern to go carbon on.
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Old 10-02-08, 01:48 PM   #4
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No problems with my cranks so far..

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Old 10-02-08, 04:48 PM   #5
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I have a standard sized CF Easton Monkeylite bar that has handled quite alot of abuse and falls, and no problems with it yet. I don't think I'd go for a light CF seatpost though, for that (and stem) I have a Thompson Elite.
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Old 10-02-08, 08:14 PM   #6
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Hmmm, what can't you make carbon? I'm guessing you probably wouldn't want carbon cogs. Carbon tires wouldn't be that great. Carbon grips, brake pads, dust boots. I guess you could have a little carbon in each of these, but I don't think carbon would be best for the entire piece.

I think carbon is just fine for mountain bikes, provided it's well made and designed. I'd actually like to see carbon brake cables. Maybe they've got 'em out there already. I bet they'd be stiffer than steel.
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Old 10-02-08, 08:26 PM   #7
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Hmmm, what can't you make carbon? I'm guessing you probably wouldn't want carbon cogs. Carbon tires wouldn't be that great. Carbon grips, brake pads, dust boots. I guess you could have a little carbon in each of these, but I don't think carbon would be best for the entire piece.

I think carbon is just fine for mountain bikes, provided it's well made and designed. I'd actually like to see carbon brake cables. Maybe they've got 'em out there already. I bet they'd be stiffer than steel.
Maybe it's me, but carbon doesn't seem like it should ever be layed-up as a cable.
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Old 10-02-08, 08:49 PM   #8
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On my XC bike I have CF bars, seatpost, and rear triangle. I could see a lot more feasible stuff on there, I never try to push it too hard.
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Old 10-02-08, 08:52 PM   #9
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Maybe it's me, but carbon doesn't seem like it should ever be layed-up as a cable.
I'd go with Kevlar or some other aramid fiber. Nanotubes are hawt.
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Old 10-02-08, 09:40 PM   #10
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Originally Posted by Smallguy View Post
personally I'm paranoid of carbon on my mtb bike

I do however know guys running carbon cranks and bars and even stems

I don't see much benefit to carbon on an mtb considering Thompson high end stuff weighs about the same and can handle a nick from a crash alot better

IMO if you gonna sapned te mnoey on carbon buy thompson
More needless paranoia/misconception about nicks on CF leading to catastrophic failure.
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Old 10-02-08, 10:15 PM   #11
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More needless paranoia/misconception about nicks on CF leading to catastrophic failure.
Word. I've attached a picture of the carbon handlebar I've put about 15,000 km on.

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Old 10-05-08, 11:24 AM   #12
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Maybe it's me, but carbon doesn't seem like it should ever be layed-up as a cable.
Not laid up, just raw carbon. Raw carbon is just a thread with a very high young's modulus (meaning it stretches very little when you tug on it). It gets all of its rigidity from the weave and epoxy it's laid in (when you try to bend the finish piece the strands in tension take the load, meaning you can make the pieces as bendy or stiff as you want by laying the strands in differently or varying the stiffness of the epoxy matrix). As raw thread though it would make a great cable because it stretches so little in tension.

Aramid would be very strong as a cable, but also stretchy.

Now, if you made carbon cables you'd want to sheath them in something to protect them from abrasion. Not sure whether arimid or steel would be the best choice for that...
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Old 10-05-08, 01:45 PM   #13
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if i was in the situation to upgrade my bike and had a chunk of change to do it with, i'd go for efficiency before i go for weight savings.

i could save a few pounds in weight... but i carry 'round a camelbak full of tools + first aid kit + water. i don't care 'bout weight... however... a set of wheels that took less effort to get going, better, more efficient rubber, a smoother crankset and a high quality rear de would be the first things i'd up.

in other words, i go for moving parts before non-moving.
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