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PostPosted: Fri Jul 20, 2012 12:14 am 
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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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Last edited by xFree on Fri Jul 20, 2012 7:02 am, edited 1 time in total.
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Posted: Fri Jul 20, 2012 12:14 am 


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


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


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


Oh god yes


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PostPosted: Fri Jul 20, 2012 6:22 am 
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Location: Insjön, SWEDEN
Depends on how thick the carbon tube is, but for normal road riding probably OK.

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PostPosted: Fri Jul 20, 2012 6:35 am 
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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

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PostPosted: Fri Jul 20, 2012 8:39 am 
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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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PostPosted: Fri Jul 20, 2012 8:44 am 
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Cinelli Grammo titanium :beerchug:

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

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Posted: Mon Mar 11, 2013 4:51 pm 


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PostPosted: Mon Mar 11, 2013 5:11 pm 
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Location: Yorkshire - God's Own Country
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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