Sorry, "self aligning torque." But is the rack secure?
On Wednesday, September 7, 2011, Ken Freeman <kenfreeman...@gmail.com> wrote: > Congrats! > I don't think its related to the self-restoring force. That is supposed to be generated in the tire/road contact patch. > > On Wed, Sep 7, 2011 at 6:33 AM, NME <nicolemea...@gmail.com> wrote: >> >> Thank you all for your really insightful comments! I tried a few more >> things, including some your suggestions -- made sure the wheels were >> aligned, checked tire pressure, etc. >> >> I noticed that the problem was much worse when I was on smooth >> asphalt, but would almost disappear when I was riding on gravel, >> cobblestones, or bricked sidewalk, so it occurred to me that the >> problem was this "harmonic" vibration -- not that the bike was out of >> alignment, but that it was too perfectly aligned. So on a whim, I >> *loosened* the bolts to the rack -- not enough that the rack wobbles >> or is in danger of coming unscrewed, but just enough that there can be >> some miniscule "give" between the rack and the frame. My idea was >> that if I could disrupt the perfect transmission of this vibration, >> then it wouldn't radiate to the front wheel, but would cancel itself >> out. >> >> It was the exact opposite of DougP's suggestion and the opposite of my >> original inclination, but it worked! It went from violent shimmy to >> completely smooth. No shaking at any speed. >> >> Is this perhaps another version of the "self-restoring force" Ken was >> talking about? (The maths are also beyond me.) In any case, if the >> problem happens again in another context, I'll be sure to look into >> "tire damping" (nice term) as a first resort! >> >> -- >> >> Thanks again, everyone! I'll finally be posting pictures of my AHH >> soon, now that I've got it properly scratched up and broken in. Five >> months in Berlin, and besides the daily commute, a few wonderful day >> rides already, and and now some inn-to-inn rides planned for fall. >> >> Nicole >> >> >> P.S. in answer to Ken's question -- neither me nor my mechanic are >> well-skilled. >> >> -- >> You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. >> To post to this group, send email to rbw-owners-bunch@googlegroups.com. >> To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com < rbw-owners-bunch%2bunsubscr...@googlegroups.com>. >> For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en. >> > > > > -- > Ken Freeman > Ann Arbor, MI USA > -- Ken Freeman Ann Arbor, MI USA -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
