Does headset dust cap suppose to rotate

Discuss light weight issues concerning road bikes & parts.
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asiantrick
Posts: 126
Joined: Fri Dec 04, 2015 11:18 pm
Location: the OC, CA

by asiantrick

Pic for illustration only (not my bike)

Image

So I took the opportunity to give the headset bearings a wipe and re-grease. I put everything back the way it supposed to and tighten the top cap about 3nm (I'm always worried about over torquing)

Once I was done, I tried holding front brake and looking for play...no play at all. Dropping the front to hear knocking sounds...no knocking sounds heard.

But I noticed that I can use my finger and able to rotate the dust cap once everything is tighten. Is that normal? Should I tighten the headset more so the dust cap can't be rotated.

My set up is slammed and stem is on top of the dust cap (no spacer). I'm running FSA sealed bearing headset
Last edited by asiantrick on Thu Sep 07, 2017 11:51 pm, edited 1 time in total.

by Weenie


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bikerjulio
Posts: 1901
Joined: Fri Dec 11, 2009 10:38 pm
Location: Welland, Ontario

by bikerjulio

torque is not the right way to set preload.

my method involves tightening until the front wheel "floppiness" slows but is still there. plus the other tests.

on none of my bikes can I rotate the top bearing cover.
There's sometimes a buggy.
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One.

So let's just say I'm drivin' this buggy...
and if you fix your attitude you can ride along with me.

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wheelbuilder
Posts: 445
Joined: Wed Feb 08, 2017 2:10 am

by wheelbuilder

Good question you don't hear about often. This is one of the secret tests I use at the shop to see if headset pre-load is optimal. If I can spin the dust cover or the spacers below the stem if any, it is slightly loose in my opinion. The rocking method is good and tried-and-true, but after this, the spin test makes it perfect.

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kkibbler
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Joined: Tue Sep 09, 2014 9:30 am

by kkibbler

Headset cover shouldn't spin (mine is an aero cover that mates with the spacers and bar/stem, but still).

Just by feel, 3nm seems too much, I'm surprised your front end doesn't bind up.

kode54
Posts: 1210
Joined: Tue May 23, 2006 9:39 pm

by kode54

i once took mine apart and put the shim seal in the wrong order. once i corrected that, i couldn't spin my top cap.
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Orlok
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Joined: Tue Feb 07, 2017 12:36 pm
Location: Almere - Nederland

by Orlok

The headset dust cap can rotate when the headset is loose or isn't tight enough. In my opinion you should tighten the headset more so the dust cap can't be rotated.
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Pinarello F10 - Ultegra 6800 - Carbonspeed C38 - Tubeless

by Weenie


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