[net.bicycle] Speed Wobble Troubles-- Adjust t

craig@hp-pcd.UUCP (craig) (12/08/84)

If your headset is giving you grief, you might also check
to see if the headtube has been faced properly.  Alot of bikes
seem to be assembled without making sure the ends are parallel
which means the headset has high and low spots which in turn
means that you will be able to properly adjust the head set
in about one position (as you turn the forks the headset gets looser
or tighter).
				Craig Durland     ...!hp-pcd!craig

scroggs@uiucdcsp.UUCP (12/13/84)

After a near-spill at about 30mph, I did adjust the headset.  I even adjusted it
to be little tight (according to a mechanic where I had purchased the vehicle).
My adjustment method was to first tighten the headset to the point that I could
not detect any looseness.  I checked by applying the front brake and pushing
it in all directions.  Once I had been satisfied that there was no 'play' in
the headset, I went for an adjustment ride.  Each time I noticed that the
bicycle was starting to wobble, I stopped and tightened the headset just a bit.
I did this until the headset was restricting steering a little.  This seems
to have supressed the wobble, moving the 'danger speed' about 8mph higher,
although my first test experience nearly resulted in a crash and has kept
me from testing the upper limits (besides, there are many variable aspects
to the situation, i.e. how tightly I hold onto the handlebars, position
of my body).  I think that I will try a new headset--next summer.