Extending carbon fork steer tube

Discuss light weight issues concerning road bikes & parts.
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xFree
Posts: 42
Joined: Sun Oct 11, 2009 1:17 am

by xFree

I have modified the original expansion plug to extend my steer tube length by ~2cm.
Is there any potential problem with this setup?

Image

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With stem
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Attachments
Fork03.JPG
Fork02.JPG
Fork04.JPG
Fork05s.jpg
Last edited by xFree on Fri Jul 20, 2012 7:02 am, edited 1 time in total.

latman
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Joined: Thu Aug 20, 2009 12:44 pm

by latman

At least the bottom of your stem will be clamping the steerer tube !

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michel2
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by michel2

Isnt your expander going to work as a lever ? If your stem clamps on the ally bit the force on the carbon clambing area is going to be bigger than in a normal situation ?

socratease
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by socratease

xFree wrote:Is there any potential problem with this setup?


Oh god yes

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Mattias Hellöre
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by Mattias Hellöre

Depends on how thick the carbon tube is, but for normal road riding probably OK.
Experimental Prototype

em3
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by em3

michel2 wrote:Isnt your expander going to work as a lever ? If your stem clamps on the ally bit the force on the carbon clambing area is going to be bigger than in a normal situation ?



+1

Simply to risky considering the high torsional forces applied to the steer tube...not worth it!

Just curious, where did u find such a gizmo, or is this something you CNC'ed yourself?

EM3
______________

xFree
Posts: 42
Joined: Sun Oct 11, 2009 1:17 am

by xFree

Mattias Hellöre wrote:Depends on how thick the carbon tube is, but for normal road riding probably OK.
The fork is 1" Colnago Star Carbon fork and the tube thickness is ~3 - 3.5mm.

em3 wrote:
michel2 wrote:Isnt your expander going to work as a lever ? If your stem clamps on the ally bit the force on the carbon clambing area is going to be bigger than in a normal situation ?



+1

Simply to risky considering the high torsional forces applied to the steer tube...not worth it!

Just curious, where did u find such a gizmo, or is this something you CNC'ed yourself?

EM3

My friend made this one for me with his CNC.

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SWijland
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by SWijland

Cinelli Grammo titanium :beerchug:

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ElDuderino
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by ElDuderino

side note, that stem has a TON of stack height. perhaps use something with lower profile?

Svetty
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by Svetty

Can't really tell whether it's safe or not without knowing the height of the spacer stack below the stem.

It might look shite but can't you just flip the stem?

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