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PostPosted: Thu Sep 07, 2017 11:15 pm 
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Joined: Fri Dec 04, 2015 11:18 pm
Posts: 104
Location: the OC, CA
Pic for illustration only (not my bike)

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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.

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Posted: Thu Sep 07, 2017 11:15 pm 


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PostPosted: Thu Sep 07, 2017 11:26 pm 
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Joined: Fri Dec 11, 2009 10:38 pm
Posts: 1867
Location: Welland, Ontario
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.

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PostPosted: Fri Sep 08, 2017 4:55 am 
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Posts: 188
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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PostPosted: Fri Sep 08, 2017 5:40 am 
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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.


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PostPosted: Fri Sep 08, 2017 4:10 pm 
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Joined: Tue May 23, 2006 9:39 pm
Posts: 1055
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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Posted: Fri Sep 08, 2017 4:10 pm 


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PostPosted: Fri Sep 08, 2017 5:35 pm 
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Joined: Tue Feb 07, 2017 12:36 pm
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Location: Almere - Nederland
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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