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 Post subject: KCNC Expander Plug Issue
PostPosted: Thu Sep 29, 2011 12:43 am 
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Location: Mornington Peninsula
My KCNC expander plug on the CAAD9 has been regularly coming loose causing play in the steerer. Has anyone else experienced the same or similar issues with this part?
What if any solutions might there be other than just going with something else?

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 Post subject: KCNC Expander Plug Issue
Posted: Thu Sep 29, 2011 12:43 am 


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PostPosted: Thu Sep 29, 2011 1:31 am 
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extralite ultrastar 2, does the job perfectly and is light as hell

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PostPosted: Thu Sep 29, 2011 2:06 am 
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devinci wrote:
extralite ultrastar 2, does the job perfectly and is light as hell



+1

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PostPosted: Thu Sep 29, 2011 2:11 am 
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+1

Sent from my ADR6300 using Tapatalk

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PostPosted: Thu Sep 29, 2011 3:09 am 
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The plug only loads the bearings. The stem keeps everything tight. If the stem is tightened correctly, you should be able to remove the plug. If you wish.


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PostPosted: Thu Sep 29, 2011 3:31 am 
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But then if your stem comes loose on a ride, it's SOL. Never happened to me yet, but....

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PostPosted: Thu Sep 29, 2011 3:55 am 
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Yeah, i know. Wouldn't remove mine. Just saying that it's not his bung that's to blame. (or maybe it is).


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PostPosted: Thu Sep 29, 2011 4:27 am 
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carbon build paste between the stem and steerer. Use a torque wrench and a tiny amount of LOW STRENGTH (the yellow one???) loctite on the thread of the expander. Job done.
Some steerers MUST be run with the expander in place.......I'm not sure about your one tho.

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PostPosted: Thu Sep 29, 2011 4:43 am 
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Not all steerer tubes accommodate the Extralite Ultrastar 2 though.

This past weekend 4 (FOUR!) forks I had on hand did not have an ID large enough to even fit the ultrastar in snuggly (before tightening).

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PostPosted: Thu Sep 29, 2011 5:28 am 
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I might revisit the stem bolt tension. It could be that. Just never had this problem before mounting the KCNC. It has a weird tightening mechanism that requires the expansion part of the part to be adjusted before locking the whole thing in place - it seems to work okay during install but none of my other expanders have used this design. :noidea:

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PostPosted: Thu Sep 29, 2011 5:52 am 
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Is the OD of the ultrastar vs the ultrastar 2 the same? Or is it just a modification of how it tightens that differs? Only reason I ask is because I couldn't use version 1 with my colnago C59 and for my caad10 I had to bring the dremel out to reduce the OD to get it to work


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PostPosted: Thu Sep 29, 2011 6:05 am 
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I've used various KCNC expanders on different bikes and I can't remember one rattling lose, neither in carbon steerers nor in an aluminium one. I've always used dynamic paste when using it with cf.

Is the expander coming lose, or the bolt holding the top cap?

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PostPosted: Thu Sep 29, 2011 6:58 am 
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I had the Kcnc one, it too kept coming loose so I ordered a Extralite Ultrastar 2 and haven't touched it once since It was fitted 7 months ago. very light yet stays in. soild. :D


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PostPosted: Fri Sep 30, 2011 2:35 am 
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Ypsylon wrote:
I've used various KCNC expanders on different bikes and I can't remember one rattling lose, neither in carbon steerers nor in an aluminium one. I've always used dynamic paste when using it with cf.

Is the expander coming lose, or the bolt holding the top cap?


To be honest I'm not sure. But every 5 or 6 rides I need to undo everything and re-tighten to stop the rattle in the steerer.

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Posted: Fri Sep 30, 2011 2:35 am 


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PostPosted: Fri Sep 30, 2011 8:09 am 
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I find that very strange.

Do you use carbon paste? How large is the gap between the spacer and the steerer?

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