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Old 05-04-05, 08:31 PM   #1
cazzooo
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Carbon Steerer Tube: expander wedge or starfangled nut?

Does anybody know whether it is OK to use a star nut inside a carbon steerer tube?
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Old 05-04-05, 08:38 PM   #2
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Does anybody know whether it is OK to use a star nut inside a carbon steerer tube?
No...Except in the case of CF steerers that are specificlly designed for one. Time use to pedal one that was, and there may be others.
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Old 05-04-05, 09:16 PM   #3
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Originally Posted by sydney
No...Except in the case of CF steerers that are specificlly designed for one. Time use to pedal one that was, and there may be others.
I believe the word you're looking for is "peddle", not "pedal".
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Old 05-05-05, 06:45 AM   #4
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I believe the word you're looking for is "peddle", not "pedal".
No...this is about bicycles not door to door toilet brush sales.
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Old 05-05-05, 07:00 AM   #5
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My LOOK fork has a carbon steerer and I got the bike it's on used. It had, and still does have, what looks like an oem aluminum nut in it. It doesn't look like the typical star nut, it's just a cylindrical piece of aluminum with vertical ridges on the outside. Not only does it pull out of the fork under normal headset tightening forces, but it's scaring the inside of the steerer a little in the process. I'd like to find a better solution, but the two LBSs I've taken it to have kinda discouraged the expander wedge. The better bike shop told me about some aftermarket solution where an aluminum tube is bonded into the steerer tube so that you can use any old star nut. Any suggestions?
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Old 05-05-05, 07:27 AM   #6
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Originally Posted by juicemouse
My LOOK fork has a carbon steerer and I got the bike it's on used. It had, and still does have, what looks like an oem aluminum nut in it. It doesn't look like the typical star nut, it's just a cylindrical piece of aluminum with vertical ridges on the outside. Not only does it pull out of the fork under normal headset tightening forces, but it's scaring the inside of the steerer a little in the process. I'd like to find a better solution, but the two LBSs I've taken it to have kinda discouraged the expander wedge. The better bike shop told me about some aftermarket solution where an aluminum tube is bonded into the steerer tube so that you can use any old star nut. Any suggestions?
There are different compreession bungs that can replce what you have, and don't have the little ridges. I have never had an issue with the standard Look bung on several bikes. The bonded in aluminum sleeve can also work if you want to go to the trouble.
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Old 05-05-05, 09:19 AM   #7
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FSA makes a cost effective expansion plug with cap that works with nearly any carbon steerer. It's very easy to use and can be moved and re-set. Make sure you get the correct size, 1" or 1 1/8".
My LBS stocks these.

Al
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Old 05-05-05, 09:36 AM   #8
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Originally Posted by Al1943
FSA makes a cost effective expansion plug with cap that works with nearly any carbon steerer. It's very easy to use and can be moved and re-set. Make sure you get the correct size, 1" or 1 1/8".
My LBS stocks these.

Al
They can even be sized differently depnding on if the steerer is CF,aluminum or steel. Get the one for correct steerer ID.
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Old 05-05-05, 09:56 AM   #9
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Originally Posted by sydney
There are different compreession bungs that can replce what you have, and don't have the little ridges. I have never had an issue with the standard Look bung on several bikes. The bonded in aluminum sleeve can also work if you want to go to the trouble.
By "compression bungs", do you mean one of the expanding wedge things, like the FSA? I suspect that the headset was way overtightened by the previous owner, based the condition of the rest of the bike when I got it.
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Old 05-05-05, 01:59 PM   #10
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Originally Posted by juicemouse
By "compression bungs", do you mean one of the expanding wedge things, like the FSA? I suspect that the headset was way overtightened by the previous owner, based the condition of the rest of the bike when I got it.
I have yet to see a compression bung that did not work on some some type of compression plug that caused it to expand and grip the steerer when the plug(not wedge) was pulled into the bae of it.The FSA I have has an 'O' ring around it that grips the steerer and may be more steerer friendly than the ridged Look bung. Unfortunately, hacks and morons do great damage to bicycles.
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Old 05-05-05, 09:11 PM   #11
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Originally Posted by sydney
They can even be sized differently depnding on if the steerer is CF,aluminum or steel. Get the one for correct steerer ID.
The OP said he has carbon. A quick Google check found only 1 1/8" FSA compression plug.

http://gallery.bcentral.com/GID49468...sion-Plug.aspx
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Old 05-05-05, 09:31 PM   #12
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Originally Posted by Al1943
The OP said he has carbon. A quick Google check found only 1 1/8" FSA compression plug.

http://gallery.bcentral.com/GID49468...sion-Plug.aspx
Mine for a 11/8" doesn't identify steerer material,but is marked for ID of 22-23mm. He could have a 1", and even CF steerers may vary in ID. I've always used the bung supplied by the fork maker and haven't had to deal with trying to match up aftermarket stuff.
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Old 05-05-05, 10:05 PM   #13
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This link to the FSA web site show that their carbon fork compressor it available in both 1" and 1 1/8" sizes. I have the 1" installed in my carbon fork and it works great.
http://www.fullspeedahead.com/fly.as...xid=34&pid=248
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Old 05-06-05, 09:11 AM   #14
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Originally Posted by blandin
This link to the FSA web site show that their carbon fork compressor it available in both 1" and 1 1/8" sizes. I have the 1" installed in my carbon fork and it works great.
http://www.fullspeedahead.com/fly.as...xid=34&pid=248
Good info!

Al

Last edited by Al1943; 05-09-05 at 07:32 PM.
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Old 05-06-05, 09:48 AM   #15
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No...this is about bicycles not door to door toilet brush sales.
Actually, it would be peddle. Time used to peddle (sell) one.
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Old 05-08-05, 02:02 AM   #16
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Originally Posted by blandin
This link to the FSA web site show that their carbon fork compressor it available in both 1" and 1 1/8" sizes. I have the 1" installed in my carbon fork and it works great.
http://www.fullspeedahead.com/fly.as...xid=34&pid=248
blandin.. can i use this on my cane creek IS2 headset? instead of using the star flange.. can i just use this? i have an alu. steerer
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Old 05-08-05, 02:33 AM   #17
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A compression plug will probably work on an aluminum steerer. Note that on a carbon steerer, most compression plugs are designed to not only allow you to preload the headset stack but also provides internal reinforcement of the steerer tube to prevent crushing by the stem's clamp. Depending on the fork, this is can be crucial. Other carbon steerers and/or stems are designed to spread out the load around the steerer tube's diameter more evenly. Regardless, you should always follow the proper torque specs. On an aluminum steerer, the need for internal reinforcement is probably not as crucial thus the only purpose for a top-bolt and starnut or compression plug is to set up the initial stack preload. In actuality you really don't even need it at all. I've seen mechanics simply compress the stack by hand, cinch up the stembolts and check that the stack has enough preload by rocking the bike with the front brake set to see if the headset moves. Of course having that big hole in the stem looks unsightly and there's that off-chance that the preload will lessen over time leading to a loose headset which can of course result in a damage. It's nice to have an easy ability to add back preload whenever it's needed. Most people insist on a top-cap.
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