Ken: The rack is secure! It's not quite loose enough that I can
unscrew the bolts by hand or that I can rattle it by shaking it. In
any case, I'll be sure to keep an eye on it every couple of weeks and
tweak as needed.
Marc: Good idea with the cork fender washers. I'll invest in some
the next
I like that idea, absorb some of the resonant energy present in the loaded
rack, which is presumably vibrating.
On Wed, Sep 7, 2011 at 12:29 PM, Marc Schwartz wrote:
> Dear Nicole &tc
>
> Perhaps cork or leather fender washers (as sold by Velo Orange, Rene Herse
> (Boulder), and others) at the r
Dear Nicole &tc
Perhaps cork or leather fender washers (as sold by Velo Orange, Rene Herse
(Boulder), and others) at the rack mounting bolts would provide sufficient
damping to deal with the shimmy, yet allow enough tightening torque on the
bolts to prevent them from working loose over time due
Nicole:
Congrats on solving the problem. This is a great example of the
elusiveness of sources of shimmy and their cures.
dougP
On Sep 7, 3:33 am, NME wrote:
> Thank you all for your really insightful comments! I tried a few more
> things, including some your suggestions -- made sure the whee
Congrats. Nice outside-of-the-box thinking. Reminds me of the violent
front brake shudder I cured by toeing the brakes OUT as far as I
could.
Gernot
On Sep 7, 5:33 pm, NME wrote:
> Thank you all for your really insightful comments! I tried a few more
> things, including some your suggestions -
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 wrote:
> Thank you all for your really insightful comments! I tried a few more
> things, including some your suggestions -- mad
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 g
What I would do .. Right or wrong.. Shrug
Air tires to static inflation for tests.
Remove load and ride.. Test for free handed shimmy. If it shimmies does hand
on top tube stop it?
Does coating make a difference.. Coast a bit faster slower etc. Try the other
direction ..
Remember Wind will
Nicole:
Check the rack struts where they attach the rack. I also have the
Nitto big back rack & have noticed those can loosen up. It's not much
but can allow enough play in the rack for it to move around. My guess
is a bike is more sensitive to weight on top of the rack than on the
sides.
doug
One of my Rivs shimmied mildly with narrow tires; replacing them with
31 mm Kojacks seems to have put a stop to it -- tho' when I replace
the seat wedge with a small front rack bag, it may come back. As
Scotty said, the causes are legion.
On Mon, Sep 5, 2011 at 9:20 AM, Scotty wrote:
> My bike de
My bike developed a frustrating shimmy that turned out to be from spokes
loosening up. Retentioned the rear wheel and the shimmy went away. I guess
there are probably a hundred different things that can cause a shimmy.
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