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star nut on carbon steerer(12 posts)

star nut on carbon steererjtbravo77
Feb 14, 2002 6:38 PM
i need help with a star nut that is pulling out of my carbon steerer. can this be replaced with a "special" one for carbon forks? it was put in at factory (cannondale) and has managed to work its way on out as i have had to retighten the headset on the caad6 i have. any suggestions?
re: star nut on carbon steererweiwentg
Feb 15, 2002 4:56 AM
I assume you're referring to the expander wedge. no one uses star nuts on carbon steerers. they will basically destroy the steerer.
now, afaik, you can just get the LBS to replace it - any expander wedge should work.
re: star nut on carbon steererfeathers mcgraw
Feb 15, 2002 7:08 AM
Most people will tell you to stop riding that fork immediately. Star nuts chew up the carbon pretty good. If you're willing to risk it Profile makes an aftermarket expander wedge (most wedges come new with the fork and are made for that specific inside diameter).
Another Issue I Had With Spokes Wheaton, IL Star Nut and CarbonRollinFast
Feb 17, 2002 8:22 PM
I bought a frame from Spokes in Wheaton,IL. They installed the headset, cut the fork, and installed it. Upon changing the stem a month later to get a better fit, I asked the guys at Licktons to install the stem for me. The first thing Robin, the mechanic, noticed was that a star nut was installed in the carbon steer tube of the fork. It had already started eating the carbon away. I was very upset at Spokes, especiallly since they advertise their over 30 years of expertise. I went back to the store to call them on it, and they told me it would work just as well as the expander wedge and would not change it. Spokes customers beware of shortcuts they may take. This might have caused serious damage to both my bike and me. I won't be doing anymore business with Spokes in the future. They told me I was wrong about the star nut. I think I was wrong ever giving them a dime.
now you are out of controlwhiner
Feb 17, 2002 8:33 PM
shut up already and end this personal vendetta
now you are out of controlfeathers mcgraw
Feb 18, 2002 10:26 AM
I don't know about the history of this 'vendetta', but in my opinion rollinfast is right on this one. I had an LBS do the same thing to me. Luckily I was able to cut off the damaged portion and use the fork in a bike with a shorter head tube. There's a lot of bonehead mechanics out there, as well as shop managers who absolutely refuse to admit they're wrong.
Feb 18, 2002 10:37 AM
star nuts should not be used on CF steerers.
Misinformed ShopsRollinFast
Feb 18, 2002 1:36 PM
You are correct. There are a lot of mechanics that have no clue what they are doing, or they do and make decisions to take short cuts which could get the customer hurt. I feel like it is important as a consumer to demand the best and call owners of the shops on their mistakes. The reason I found out is I heard a rattle in my headtube when I took the bike off my car. Part of the star nut broke off and was causing the noise. I then took it to a pro shop whose expression was who in the hell installed your fork? It is important that you take your bike to a properly trained shop. Unfortunately, it is my guess, especially when it comes to higher dollar equipment, the most LBS don't cut the mustard. When they cut corners, the consumer gets hurt both physically and economically.
re: star nut on carbon steererAkirasho
Feb 15, 2002 9:03 AM
Cannondale did use a star fangled on CF steerers (though I don't know if they still do). Cannondale reported that they'd done extensive testing and that the star fangled was safe in their application (though I'm suspicious).

You could certainly use another vendor's compression plug, but I'd be a little concerned with damage retightening the old star fangled might have done... I know of no way to visually inspect something like that that would be reliable save for obvious damage.

You might want to consult a Cannondale dealer for advice or warranty issues.

We abide.

Remain In Light.
re: star nut on carbon steererg-money
Feb 15, 2002 9:59 AM
You most likly don't have a true SFN. Probably an expander wedge. Try this... Take the whole thing out, clean the wedge and inner part of the steerer with rubbing alcohol. You may have some grease residue that will hinder the proper contact with the steerer.

You "can" use a SFN on a carbon steerer, however the install must be perfect and absolutly straight in, if you wedge it, you could really chank up the steerer.

Either way... Good luck.
re: star nut on carbon steererBarnyard
Feb 16, 2002 7:36 PM
Alpha Q uses an insert that you expoxy into place. It reinforces the steering column.
re: star nut on carbon steererRod Brooks
Feb 19, 2002 6:08 AM
I was surprised and horrified to read that Cannondale 'factory fit' Star Fanged Nuts to carbon steerer's, The scoring that is likely to result from using such a device can cause stress concentration and eventual failure of the steerer. The wedge type of device should always be used to avoid scoring. The wedge type device also provides internal support against the clamping force of the handlebar stem.
(Look and ITM warn against SFN's with carbon)

I support the view of the other respondents who advise against riding until the extent of any damage has been expertly assessed.