Trail for sure makes sense, lower has less stabilizing effect at rolling
speeds but the other variables do have profundity beyond their list
relegated value. My Rambouillet scared the heck out of me on a long steep
downhill when it broke out in a full-on shimmy oscillation. I had no load
other
Patrick Moore stated: "Shimmy can be caused by any number of things"
That's true and correct. Shimmy is resonance. Resonance in a mechanical
structure means everything important is just right.
Patrick Moore is also spot on in the way to fix it: Change something and
see if it fixed it. If
interesting, ok ill get more details and see if that will help narrow down
the issue.
On Monday, August 31, 2020 at 12:43:47 PM UTC-7 Patrick Moore wrote:
> Shimmy can be caused by any number of things; it seems to be common with
> low trail designs built from very light tubing.
>
> Eliminatin
Shimmy can be caused by any number of things; it seems to be common with
low trail designs built from very light tubing.
Eliminating those 2 things leaves an indefinite number of other things. My
2003 stout-tubed custom shimmied after I changed tires; with other tires,
it disappeared.
Start by el
interesting , I is light weight tubing and a small front rando bag in the
front.
On Monday, August 31, 2020 at 11:05:56 AM UTC-7 James Valiensi wrote:
> Your down tube isn’t stiff enough.
>
> On Aug 31, 2020, at 10:54 AM, Sam Perez wrote:
>
> why does my front loaded bike shimmy at speeds when
Your down tube isn’t stiff enough.
> On Aug 31, 2020, at 10:54 AM, Sam Perez wrote:
>
> why does my front loaded bike shimmy at speeds when I let go of the handle
> bar head angle is 71.5. any thoughts?
>
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why does my front loaded bike shimmy at speeds when I let go of the handle
bar head angle is 71.5. any thoughts?
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Hmmm... I have been wondering what I could do for shimmies on both the
QuickBeam and the LongLow, will have to give this a try.
When is the next raffle?... I need a new black woolie zip-tee, too!
- Andrew, Berkeley
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Hmm, will be picking one up for my bombadil rebuild when it comes back from
paint. Looks like the perfect setup at almost half the cost of Chris King.
On Jan 3, 2013 8:15 PM, "dougP" wrote:
> My Atlantis has always had an odd, annoying and somewhat unpredictable
> shimmy. This topic has been dis
My Atlantis has always had an odd, annoying and somewhat unpredictable
shimmy. This topic has been discussed ad nauseum, with the suggestion that
a roller bearing headset MAY increase the friction enough to damp out
shimmy. Since my problem was limited to certain load conditions (heavy
rear &
in the eighties i had a bianchi ( superleggera, reparto corsa) that
would shimmy. i have noticed, over the years, that the new frames,
including my riv's, with the the new tubing seem to have more strength
torsionally. my experience is that these modern frames are much less
likely to shimmy than th
On Sat, 2010-12-11 at 20:18 -0800, james black wrote:
> On Sat, Dec 11, 2010 at 04:59, Steve Palincsar wrote:
> > Knee to top tube is a highly effective and well known (in my experience)
> > way to stop /speed wobble/ -- as distinguished from "shimmy". And speed
> > wobble happens with hands on t
On Sat, Dec 11, 2010 at 04:59, Steve Palincsar wrote:
> Knee to top tube is a highly effective and well known (in my experience)
> way to stop /speed wobble/ -- as distinguished from "shimmy". And speed
> wobble happens with hands on the bars, in fact can be caused by those
> hands on the bar (de
Which must the Motown view ...
On Saturday, December 11, 2010, hobie wrote:
> Shimmy,shimmy,cocoa pop
>
> On Dec 10, 1:03 pm, William wrote:
>> I am a recent subscriber of Bicycle Quarterly. I had thought about
>> subscribing for a while, and two things about the newest issue made me
>> pu
On Fri, 2010-12-10 at 23:10 -0500, stanwas...@bellsouth.net wrote:
> Some time ago I read somewhere, here perhaps, that a possible
> technique for eliminating a shimmy on a bicycle was to gently apply
> pressure to the top tube with one's knee, assuming one could not be
> bothered to return ones ha
I rode motorcycles about 30 years ago, and there was an aftermarket product
that was seen as having the potential to help - the adjustable hydraulic
steering damper. It was a miniature version of a car shock absorber,
looking about as large around as a tailgate lifter off of a modern car.
They oft
on 12/10/10 10:03 AM, William at tapebu...@gmail.com wrote:
> Since I'm growing convinced that there might not be anyone who really
> understands shimmy, I'm going to run some experiments of my own on my
> Hillborne to attempt to understand it more. Since that bike, in it's
> current state, shimmi
I worked in a multi line motorcycle shop from '85 - '95, and have been happily
riding motorcycles and bicycles for many, many years. Not surprisingly,
motorcycles experience a similar phenomenon Because of the greater vehicle
mass and higher speeds, a simple wobble or shimmy can quickly become
Shimmy appears to be one of many properties of bicycles that is not
well understood. The math involved to describe what bikes do is very
complicated- even just turning a corner is hard to describe
mathematically because the bike describes arc in two different
planes- and fortunately we don
Send this part off to Eben Weiss. He can always use good material..
From: William
>>The Cliff-notes synopsis is: "I don't know what causes shimmy, nor does
anyone else. Here's what several oldschool guys said about shimmy.
They were wrong. I can't take a b
On Fri, Dec 10, 2010 at 1:33 PM, Steve Palincsar wrote:
> On Fri, 2010-12-10 at 10:03 -0800, William wrote:
>> I expected
>> by now somebody would have started a thread about the shimmy article,
>> but it is towards the back.
>
> And let's not forget, much of the country has yet to receive the Win
On Fri, 2010-12-10 at 10:03 -0800, William wrote:
> I expected
> by now somebody would have started a thread about the shimmy article,
> but it is towards the back.
And let's not forget, much of the country has yet to receive the Winter
2010 BQ issue. So please, wait on the discussion until we
I am a recent subscriber of Bicycle Quarterly. I had thought about
subscribing for a while, and two things about the newest issue made me
pull the trigger. One was the write up about the Bilenky 650B tandem
(dude, I want one). The other was the article about shimmy. I know
Jan Heine has a reput
one). FYI, this occurred on the AHH, even with 35C
tires on the bike.
Anyone else care to comment?
Joe
> Date: Sat, 7 Aug 2010 12:37:11 -0700
> Subject: [RBW] Shimmy!
> From: mhech...@gmail.com
> To: rbw-owners-bunch@googlegroups.com
>
> In five years of riding my Rambouillet I have
In five years of riding my Rambouillet I have never experienced any
front end shimmy - until this morning. I was coming down VT 108 from
Smugglers Notch and as the bike hit 45 mph I shifted my hands from the
drops to the center, to get into a tuck, and all of a sudden I got
this slight, but unnervi
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