Bicycle Mechanics - threadless headset question

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gman26
03-10-09, 11:31 PM
On a threadless headset, does the stem hold the fork in place? Also, what is the star-bolt-nut assembly for; does it just cover the hole?

UnsafeAlpine
03-10-09, 11:55 PM
The stem keeps the fork from sliding off. The star nut, headset cap, and bolt hold it all together.
Soil_Sampler
03-11-09, 12:18 AM
Also, what is the star-bolt-nut assembly for; does it just cover the hole?

adjust headset play.

abarth
03-11-09, 12:34 AM
The star nut and the cap for adjust compression of the headset. The stem to lock and hold everything together. So first loosen the stem, then you adjust the headset via the cap. Once the adjustment is done, you tighten the stem to lock everything in place.
Longfemur
03-11-09, 05:45 AM
Mechanically, the star nut is just there to allow you to set the tension on the whole thing temporarily until you get the stem itself clamped onto the tube. Ultimately, once the stem is clamped on at that position, it's the stem being clamped onto it that holds everything in place.
gman26
03-11-09, 07:59 PM
OK. I understand.

How do you remove the star nut? It looks like it would be difficult, even with the bolt removed.
bindibadgi
03-11-09, 11:12 PM
You don't, generally, remove star nuts. You can bash it down further if you need to replace it. Then you just put a new one in.

If you really have to get rid of it (why?) then you may need to drill it and break it into pieces which can then be removed.