Carbon bolts...

Discuss light weight issues concerning road bikes & parts.
redliner
Posts: 4
Joined: Mon Jan 02, 2006 2:57 am

by redliner

I thought I saw a link to some carbon fiber bolts/screws about a year or so ago, but can't find it. Does anybody know of a company that makes them? Thanks.


by Weenie


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coloclimber
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by coloclimber

BTP and TasyNutz have them as well. Very pricey.
-Deacon Doctor Colorado Slim

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synchronicity
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by synchronicity

One thing I'll give them though... They are stronger than I thought... for the bottle cages that is... :o
Vertebrae. Precision braking and shifting.

The_Dude
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by The_Dude

Buy a TIME. Comes with free French made water cage bolts.

Raxel
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by Raxel

Heard that they are actually stronger than alloy bolts, so one can use them anywhere on the bike except for seatpost clamps and stems.

BrianAllan
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by BrianAllan

Raxel wrote:Heard that they are actually stronger than alloy bolts, so one can use them anywhere on the bike except for seatpost clamps and stems.


:shock:

aeroslave
Posts: 258
Joined: Tue Oct 14, 2008 12:56 am

by aeroslave

Cyclespeed Australia sells them for my antipodean brethren:

http://www.cyclespeed.com.au/c/145882/1 ... bolts.html
"Light bike? Its still about the engine!".

bazmac
Posts: 93
Joined: Mon Jan 06, 2014 4:30 am

by bazmac

Hi, keen to hear who is using carbon, nylon or even plastic bolts? Where do you use them? Lastly where do you purchase them?

Cheers
Baz


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drainyoo
Posts: 736
Joined: Sun Jun 17, 2007 6:56 pm

by drainyoo

Schmolke makes them, and you can't use them on anything load bearing like a stem. You can use them a bottle cage, headset cap, derailleurs. Here is a complete list of where you can used them:

http://www.schmolke-carbon.de/carbon/ca ... schrau.php

bazmac
Posts: 93
Joined: Mon Jan 06, 2014 4:30 am

by bazmac

Thanks for that, I don't really understand why if carbon is so strong and we use it for load bearing in most applications that the bolts are different and can't be load bearing. I'm not arguing, I'm just keen to understand the reasoning or really the engineering behind why its brilliant for frames, cranks, bars, stems...but for this application its no good?

Cheers baz


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XCProMD
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Joined: Sat Jan 26, 2008 10:25 am
Location: Cantabria

by XCProMD

The problem is you can build carbon rods that are stronger and stiffer than almost anything else (boron composite would be even stiffer). But how do you deal with the shear forces at the base of the threads?

Furthermore, for certain applications, a material with the fragile failure mode of CFRP is a risk. You prefer something able to bend past the yield strenght point in places where your life is at risk.

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stephen@fibre-lyte
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by stephen@fibre-lyte

As far as I'm aware 'carbon' bolts aren't usually carbon fibre as such either. I'm fairly sure that they are peek plastic impregnated with carbon. Not that there's anything wrong with that :D

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coloclimber
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by coloclimber

I got some carbon bolts with a Time RXR frameset. I would only use them in water bottle cage application where a fail would not change my ability to ride home.
-Deacon Doctor Colorado Slim

dereksmalls
Posts: 2008
Joined: Tue Aug 02, 2011 9:20 pm
Location: New Zealand

by dereksmalls

I'm only using nylon bolts for bottle cages but some people use them in derailleurs for tension screws as well and holding on brake blocks

by Weenie


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