I think that shimmy occurs when some multiple of the resonant frequency
of the bicycle is induced.
I think the test of this is to vary the resonant frequency of a bike that
shimmies to see what effect that has on that shimmy-state.
So those who have bikes in shimmy-state are the fortunate few who
can engage in such tests. So I propose that they become the subjects
of tests that the rest of us can help with.
Who's interested in participating?
My thinking is that if a load's mass or position are varied significantly,
that a given shimmy-state will be altered (eliminated or modified).
I yield the floor and encourage you, dear reader, to step up and share
your thoughts.
I think that front-end shimmy is a harmonic. I think that shimmy occurs when some multiple of the resonant frequency of the bicycle is induced. I think the...
I'm all over that. I have been planning a test ride (maybe as soon as this afternoon) where I would ride a several mile loop that includes varied terrain,...
On Sun, Jun 29, 2008 at 8:19 AM, Kogswell Cycles ... That is how I understand it as well. My cargo bike generates a shimmy when loaded, and my experience has ...
... James, I hear what you're saying, but as a counter point my P/R also shimmies with a light load in a Candy Bar bag strapped to the handlebars. That bag...
... Hi Jim: That is unfortunate to hear, but I guess I'm not too surprised. With my Nishiki (73 deg. HA, 40mm trail), I had no shimmy at all before I installed...
... I may be interested, but I've got my bike set up just the way I like it, so I don't want to modify much. A bit of data: I lent my P/R to a list member for...
... Interesting. Any ideas what would account for the bike shimmying with one rider, but unwilling to shimmy with another? Is the other rider of similar body...
... On my bike, the frequency of the shimmy seems to be somewhat in sync with my pedal cadence. And if I stop pedaling and touch a knee against the top tube,...
... You reminded me that I did notice on my cargo bike that pedalling really slowly, less than 60 rpm, seemed to lessen the shimmy when I had a huge front...
... James & Ryan, just to clarify -- do your bikes shimmy even with hands on the handlebars? To be clear, mine doesn't: the only shimmy I'm experiencing is...
... My road bikes typically don't shimmy with hands on the handlebars, the shimmy usually gets going shortly after I start with the no-hands. My cargo bike...
Hi Ryan and all, The mystery rider finally comes out of the woodwork. Sorry I've been absent for so long but I have been lurking around the dark edges of the...
... No idea. He's pretty much my size. About the same height overall, but longer legs, I guess, since I had to raise the seat. Maybe something in riding style...
... I remember now that we couldn't get the bars as high as he would like. Maybe not being quite comfortable had an effect on riding style and led to shimmy? ...
... sideways ... How much do you weigh, and what pressure do you run your tires at? Also, please refresh my memory: how wide are those Trimline tires? Thx, ...
... About 180 lbs when I got the bike last fall, about 170 now. I lost 10 pounds on the Kogswell diet plan! ;-) Trimlines are about 36mm actual width I think...
You all are coming up with the same factors that I have collected/observed over time. The list of things that I have directly observed as affecting shimmy...
I agree - both my low trail bikes (P/R Mk I and G with low trail fork) have been prone to shimmy if the headset gets loose. Otherwise, they are very stable...
To add my two cents the only shimmy I've ever noticed on my G2 was at very low speed - say 5 MPH. And this loaded a bit oddly with a front bag (5 to 10 lbs) on...
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