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PostPosted: Tue Mar 03, 2015 5:50 am 
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Joined: Fri Feb 11, 2011 4:23 am
Posts: 300
Hi all,
Some advice on a decent compression plug. Currently in running a pro plug in my R5 2015 cervelo but I'm having trouble with it migrating up and loosening the headset preload... Anyone suggest a good (long) plug that might fix my issues?

Cheers
Harry


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Posted: Tue Mar 03, 2015 5:50 am 


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PostPosted: Tue Mar 03, 2015 8:22 am 
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Joined: Fri Oct 13, 2006 12:52 am
Posts: 250
Location: North Carolina
If you are losing headset bearing preload, then you stem bolts aren't tight enough. Once preload is set and stem tightened, you should technically be able to take the compression plug and cap off and put them in a drawer. Now I did not say ride like that, but migrating expander is just a symptom of another issue.


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PostPosted: Tue Mar 03, 2015 9:04 am 
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Joined: Wed Jan 22, 2014 11:48 am
Posts: 383
Are you using friction paste between stem and steerer?

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PostPosted: Tue Mar 03, 2015 9:36 am 
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Joined: Sat Apr 13, 2013 3:26 pm
Posts: 117
Harry,
look at this, please:
http://itm.it/itm/wp-content/uploads/20 ... ems-en.pdf

and here you are long expander (with collar):
http://itm.it/itm/products/accessories/components-2/
- 64 g.
or Deda new long expander (70mm)
or shorter Enve

and without collar:
http://www.pro-bikegear.com/en-gb/catal ... ander-long


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PostPosted: Tue Mar 03, 2015 1:51 pm 
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Joined: Tue May 23, 2006 9:39 pm
Posts: 379
i'm using extralite expanders in my carbon steerers with no issue. i switched from the Enve ones that sit on top to expander than rests inside the steerer.

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PostPosted: Tue Mar 03, 2015 2:12 pm 
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Joined: Fri Feb 11, 2011 4:23 am
Posts: 300
Marin wrote:
Are you using friction paste between stem and steerer?


Yeah used some carbon paste...


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PostPosted: Tue Mar 03, 2015 2:13 pm 
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Joined: Fri Feb 11, 2011 4:23 am
Posts: 300
fifarafa wrote:
Harry,
look at this, please:
http://itm.it/itm/wp-content/uploads/20 ... ems-en.pdf

and here you are long expander (with collar):
http://itm.it/itm/products/accessories/components-2/
- 64 g.
or Deda new long expander (70mm)
or shorter Enve

and without collar:
http://www.pro-bikegear.com/en-gb/catal ... ander-long


Thanks mate [emoji106]


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PostPosted: Tue Mar 03, 2015 2:16 pm 
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Joined: Fri Feb 11, 2011 4:23 am
Posts: 300
kode54 wrote:
i'm using extralite expanders in my carbon steerers with no issue. i switched from the Enve ones that sit on top to expander than rests inside the steerer.


I'll check them out kode...


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PostPosted: Tue Mar 03, 2015 5:11 pm 
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Joined: Sat Apr 13, 2013 3:26 pm
Posts: 117
Harry,

You must answer the question as to what is expander for...
if for expanding steerer - get long with max support
if for lightweight - get extralite - but you need to know that this is illusion - in attached manual is that this expander should be installed "in the steer tube at 5 to10mm from the top." So there is any support in lower clamping area of the stem.


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PostPosted: Tue Mar 03, 2015 5:36 pm 
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Joined: Thu Mar 26, 2009 11:06 pm
Posts: 219
WheresWaldo wrote:
If you are losing headset bearing preload, then you stem bolts aren't tight enough. Once preload is set and stem tightened, you should technically be able to take the compression plug and cap off and put them in a drawer. Now I did not say ride like that, but migrating expander is just a symptom of another issue.


This. Whether the compression plug is moving or not the preload shouldn't vary if the stem is clamped properly on the steerer.

Check the steerer tube to ensure it isn't damaged allowing it to be compressed and hence allowing the stem to move up.

You might also check that you don't need a shim above the top headset race to ensure the compression is applied to the bearing and not the head-tube.


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PostPosted: Tue Mar 03, 2015 5:56 pm 
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Joined: Mon Oct 15, 2007 9:28 pm
Posts: 987
I have had issues with this before.
1.) Yes- try paste
2.) Watch the video that Enve has for compression plug install- make sure all the pieces are greased as it shows. Also make sure that plug is tightened with torque wrench. Enve suggests 8nm.
3.) If all of this fails try to track down a Specialized compression plug. It is longer in length than an Enve type plug- seems to hold better.
I aslo find that some stems do not hold as well. Particularly Ti stems and some stems of the superlight variety.
Ritchey stems seem to hold nicely.


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PostPosted: Tue Mar 03, 2015 10:41 pm 
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Joined: Tue Mar 18, 2003 9:42 pm
Posts: 2073
you could always go for a glue in piece, like the old alpha q's had. there is a place that sells them, forget the name though.


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PostPosted: Wed Mar 04, 2015 2:18 am 
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Joined: Fri Feb 11, 2011 4:23 am
Posts: 300
Thanks guys... The main issue is it is slides up when adjusting the preload, hence I can't get a good load on the headset before tightening the stem bolts...

The steerer is not damaged.

I'm using an after market plug as my bike didn't ship with a plug..,

Using a 5mm spacer above to allow proper tensioning...


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PostPosted: Wed Mar 04, 2015 3:05 am 
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Sounds like it's simply not rift enough in the steertube. You say it's an aftermarket expander. Is the diameter compatible with the inner diameter of your steertube? It should slide in when not tightened but not be sloppy. And this may be a dumb question, and sorry if it is, but you do know that there expander has to be tightened inside the tube before you add the top cap etc, right? There's usually two bolt kind of thing such as a 6mm bolt to tighten the expander in the steertube then the 5mm top cap bolt screws into that and compresses the stem etc to take out play. Cervelo's used to have a glue in alloy sleeve as another poster suggested which when glued you just use a normal starnut for alloy steerers. But when all is said and done it seems it has to be one of those things... 1) expander bolt not tight enough in steertube; 2) expander bolt not compatible with your steertube; 3) incorrect installation procedure.

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PostPosted: Wed Mar 04, 2015 5:27 am 
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Joined: Fri Feb 11, 2011 4:23 am
Posts: 300
Yes, it's being torqued correctly and is the right size. I'd just suggest that the 20mm of plug isn't providing enough resistance to prevent migrating up when the top cap is torqued. Hence why I thought a longer plug maybe useful. I've received my S5 back today so I will steal the compression plug out of that and trial....


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Posted: Wed Mar 04, 2015 5:27 am 


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