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Aheadset/Hiddenset!!(8 posts)

Aheadset/Hiddenset!!Cat 3 boy
Jun 24, 2003 8:13 AM
So I have my pride & joy assembled, out we go for a "shakedown" first ride, sort out those last few glitches.

The Campag Record Hiddenset keeps on coming loose despite all my best efforts, I'm getting worried I'll strip the titanium bolts in the stem if I keep loosening/tightening, hunting for the elusive "correct" adjustment.

Am I on the right track: first torque down the bung in the carbon steerer to eliminate bearing play, THEN tighten the stem bolts next..all advice appreciated.
Sounds right!the bull
Jun 24, 2003 8:30 AM
Is the race on the fork bottomed out.Sometimes they settle.
re: Aheadset/Hiddenset!!Rusty Coggs
Jun 24, 2003 8:32 AM
That's the drill,assuming everything is assembled correctly.
re: Aheadset/Hiddenset!!divve
Jun 24, 2003 11:56 AM
Make sure the plastic compression ring is pushed down firmly before you mount the other parts on top of it. Try seating it all the way round with your thumb nail. Applying some lube inside the ring is also beneficial.

When tightening the top cap watch for movement at the lower bearing/fork/frame junction while you apply the front brake and slowly rock the bike back and forth. Usually there's still some play visible even though you can't feel any knocking.

It should stay adjusted properly after this or at most only require a small adjustment after it has seated during a short ride.
took me 2 or 3 rides to get it settledterry b
Jun 24, 2003 1:27 PM
Just did my first build with a hiddenset, followed all my normal "adjust, rock, adjust" routines. Left the house fine, came back loose. Did this two or 3 times before it settled in and stayed there. My uniformed opinion is that it takes a bit for the bearings to settle in. And, in fact I've had a similar experience with the regular design Chris King. I'd do it until it settles - the stem bolts should be fine as long as they are greased and you're not over-torquing them.
re: Also.........Rusty Coggs
Jun 24, 2003 2:20 PM sure the top of the steerer is far enough (about 3 mm) below the top of the stem or spacers that might be on top of it that it does not interfeer with the topcap.
One last thingEric_H
Jun 24, 2003 3:25 PM
You mention a carbon steerer tube, but not the brand of fork. Sometimes the loose headset problem can be the internal expander/wedge that is used in place of a star nut. For instance, the Reynolds fork uses an expander that is tightened into the steerer and then the top cap threads onto it. Problems can arise if the expander slips up the steerer when the top cap is tightened. When it slips, not enough pre-load can be placed onto the headset bearings, and even though they feel tight once ridden they will be loose. Clean the inside of the steerer and the expander surface with isopropyl alcohol to eliminate surface oils. Also, a light sanding of the inside of the steerer will help the expander grab onto it.
Thanks for all the v good advice......Cat 3 boy
Jun 24, 2003 11:04 PM
After 4 attempts it looks as though the bearing cups have bedded in, so far so good.

It's a Mizuno fork & I agree the bung in the steerer could easily slip, it's degreased & gripping nicely now.

Yes the fork is cut to a few mm short of the stem.

I get the feeling that although they look really clean & neat, hiddensets are a pain in the a$$!!