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Carbon steerer tube and carbon star nut?(7 posts)

Carbon steerer tube and carbon star nut?offrhodes
Oct 10, 2002 10:00 AM
I just got an Aegis Hot Rod fork with carbon steerer. I also got a Reynolds carbon compression nut to use instead of a star nut. The problem is that the headset kept loosening up. The compression nut didn't come with any directions. I did bang the compression nut deeper into the steerer tube and greased the bolt and top cap threads, this seems to have stopped the loosening, but I have only put 2.5 hours on the bike since I did that. It was loosening every 30-45minutes depending on terrain. Does anyone have the excact directions to installing one of these. If worse comes to worse could I put a normal star nut into the steerer?

Thanks,
Paul
re: Carbon steerer tube and carbon star nut?feathers mcgraw
Oct 10, 2002 10:05 AM
Wouldn't the problem be the stem and not the compression nut? Once the stem is tightened the compression nut's job is done. Whatever you do, don't put a normal star nut in there. First of all, it won't hold, and second, as it slips it'll gouge up the steerer and ruin your fork.
Not the stem that I know of.offrhodes
Oct 10, 2002 10:11 AM
I had the stem on there tight, it is a 3T Forgie with shim for the 1" steerer. I think the compression nut was actually moving upwards or the expansion bolt was loosening and, thus moving further up the top caps threads (the top cap threads onto the top of the expansion nut, which is threaded into the compression nut/washer thing).
do NOT put a normal start nut into a carbon steerer_rt_
Oct 10, 2002 10:12 AM
you'll destroy your fork.

i'm not familiar with the type of nut you are using. the one i am using (made by Profile Designs) works on counter-acting tension. the body of the nut is 2 pieces joined by the topcap screw. as you tighten the screw the two pieces expand into the steerer tube. i haven't had any problems with it loosening up.

but, if it is your headset that keeps getting loose then the problem isn't with the stem or star nut, it's with the headset, and you should have someone check the headset.

rt
is this the one you are using?offrhodes
Oct 10, 2002 10:28 AM
http://www.profile-design.com/products_accessories_gapcap.html
yup. that's the one._rt_
Oct 11, 2002 8:39 AM
'cept mine's installed in my fork.
;-)

rt
fork and expanding plug should match...C-40
Oct 10, 2002 4:23 PM
The inside diameter of different brands of carbon steering tubes is not necessarily the same. They aren't like steel steering tubes that have a standard I.D.. If the expanding plug is too small, it may not expand enough to stay snug.

The only fuction of the top cap is to apply a preload the stem and establish zero bearing clearance before tightening the steering tube clamp on the stem. The stem holds the headset bearing clearance. The top cap could be removed entirely, after the stem is tightened down, unless you've got an expanding plug that uses the top cap bolt to expand the plug.

The top cap bolt can also be tightened a small amount after the stem is clamped, to hold the top cap tighter, if that's your only problem. If the headset bearings are becoming loose, then the problem is with the stem, not the top cap.