Originally Posted by
Pacme74
rocking as in the whole bike feeling like it is rocking fore and aft without an obvious cause from me or conditions (aside from less than smooth pavement and higher speed). I’ll report back after adjusting headset.
After checking headset, Try it on fairly new smooth pavement, then the bike should ride perfectly smooth.
Otherwise it could be a frame problem or perhaps something odd with the saddle or seatpost. In that scenario, unlikely that we can provide much help on this forum. Or a tire problem, but I think that would be noticeable from looking at the tire.
Anything else I can think of would likely cause some side to side motion that you did not mention.