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Extending carbon fork steer tube

Posted: Fri Jul 20, 2012 12:14 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?

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With stem
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Re: Extending carbon fork steer tube

Posted: Fri Jul 20, 2012 12:20 am
by latman
At least the bottom of your stem will be clamping the steerer tube !

Re: Extending carbon fork steer tube

Posted: Fri Jul 20, 2012 12:20 am
by Weenie

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Re: Extending carbon fork steer tube

Posted: Fri Jul 20, 2012 12:26 am
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 ?

Re: Extending carbon fork steer tube

Posted: Fri Jul 20, 2012 6:19 am
by socratease
xFree wrote:Is there any potential problem with this setup?


Oh god yes

Re: Extending carbon fork steer tube

Posted: Fri Jul 20, 2012 6:22 am
by Mattias Hellöre
Depends on how thick the carbon tube is, but for normal road riding probably OK.

Re: Extending carbon fork steer tube

Posted: Fri Jul 20, 2012 6:35 am
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

Re: Extending carbon fork steer tube

Posted: Fri Jul 20, 2012 8:39 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.

Re: Extending carbon fork steer tube

Posted: Fri Jul 20, 2012 8:44 am
by Fatbiker
Cinelli Grammo titanium :beerchug:

Re: Extending carbon fork steer tube

Posted: Mon Mar 11, 2013 4:51 pm
by ElDuderino
side note, that stem has a TON of stack height. perhaps use something with lower profile?

Re: Extending carbon fork steer tube

Posted: Mon Mar 11, 2013 5:11 pm
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?

Re: Extending carbon fork steer tube

Posted: Mon Mar 11, 2013 5:11 pm
by Weenie

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Re: Extending carbon fork steer tube

Posted: Fri Jan 25, 2019 12:54 am
by ChiZ01
that stem is at least 20mm taller then every other 40mm stack stems