If it were me, I would dissassemble the headset and inspect not only the cups/headtube but also the fork crown/crown race. Dollars to donuts, based on your description, one or both of those surfaces isn't mating correctly.
On Tuesday, August 23, 2016 at 12:02:58 PM UTC-4, Tony McG wrote: > > From the beginning: The original owner purchased it as a frameset in '99 > because at the time, the future of the Atlantis was questionable. He built > the bike and never rode it because he found a Waterford that he liked > better. I bought it barely used a few years ago and have put a few thousand > miles (mostly gravel) on it. The headset would never stay tight no matter > how hard I dared wrench on the locknut. I took it to a LBS and they removed > the headset and machined the frame so that the headset would fit better. I > rode it for a year, and I still had problems with it loosening. I then took > it to another LBS and they installed a spacer (seems like the headset might > have bottomed out on the threads???). I now have a tight headset, but > I also have a shimmy when I let go of the handlebars. I used to be able > to ride this bike without hands at any speed, but now it wobbles, even at > 10 mph. I don't have any load on the bike except a small seatbag for > tubes/tools, and the tires are the same Soma Cazadero from last year. > > Any suggestions on what might be causing the shimmy or how to fix it? > Shall I replace it with a NeedleBlasteur from the Riv site and see what > happens? > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
