Andrew, I'd be interesting in hearing about your project.
As for me, after a couple weeks of fiddling about with this, that, and the
other, I've come to some conclusions.
1. My Sam shimmies down hills either with a dynohub wheel or a non-dyno
wheel.
2. My Sam shimmies with a rear load or withou
My 1998 LongLow has always shimmied on descents - yes, I like to take my
hands off the bars, but it was also sensed with hands on - and so I thought
a set of the new hotness needle roller bearings would be a good thing to
try. Placed an order, and coincidentally dropped the forks out today to ge
For those of you all who are still interested in my quest for perfection,
I've got some news to report.
I finally got the bike over to my ace mechanic for some evaluation. He
performed several steps in the discovery process:
1. checked the new front wheel for dish, true, tension. Discovered tha
Needle bearing headsets have quite a lot of drag, even when adjusted
perfectly. For that reason alone, needle bearing headsets are a pretty
common remedy for shimmy. I don't have first hand experience curing shimmy
with one.
This type of front end shimmy is usually considered a harmonic osc
IMO, the needle beating headsets were an improvement when they came on the
scene (in the age of crummy headsets), but in this day and age, I don't know
why anybody would bother.
I believe Cane Creek, King, FSA, VO, and perhaps others, all make/sell
cartridge bearing headsets. The Shimano 105/U
That's a fairly new item at RBW, no?
-J
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Standard headsets typically use round ball bearings on both the upper and
lower races.
Depending upon the design, the others use needle bearings on both the top
and bottom or just on the bottom. The description on the RBW page does a
pretty good job of describing the differences.
- J
On Mon
How are those headsets different from the standard headsets supplied by Riv?
On Friday, April 26, 2013 4:26:33 PM UTC-6, William wrote:
>
> Miche and Velo Orange both offer 1" threaded needle bearing headsets, if
> it comes to that.
>
>
> On Friday, April 26, 2013 7:47:44 AM UTC-7, Jim Thill -
As does a certain company in Walnut Creek -
http://www.rivbike.com/product-p/hsrd.htm
On Friday, April 26, 2013 3:26:33 PM UTC-7, William wrote:
>
> Miche and Velo Orange both offer 1" threaded needle bearing headsets, if
> it comes to that.
>
>
> On Friday, April 26, 2013 7:47:44 AM UTC-7, J
Miche and Velo Orange both offer 1" threaded needle bearing headsets, if it
comes to that.
On Friday, April 26, 2013 7:47:44 AM UTC-7, Jim Thill - Hiawatha Cyclery
wrote:
>
> While you're investigating frame alighnment, it might not hurt to try a
> new headset. The standard issue Hillborne h
Hi John. Sounds like you have a lot of things you can try this weekend to try
to solve your issue. In addition to considering getting your alignment checked,
I would also suggest the headset too. The headset that Riv sent with my frame
went indexed steering on me in short order. I wasn't comfort
Thanks for the suggestion Michael. I'll be looking into the headset early
next week.
On Friday, April 26, 2013 9:32:20 AM UTC-7, Michael Hechmer wrote:
>
> I repeat my suspicion of the head set. If it doesn't need adjustment and
> you want a new one, I highly recommend the Cane Creek.
>
> On Fr
I repeat my suspicion of the head set. If it doesn't need adjustment and
you want a new one, I highly recommend the Cane Creek.
On Friday, April 26, 2013 10:47:44 AM UTC-4, Jim Thill - Hiawatha Cyclery
wrote:
>
> While you're investigating frame alighnment, it might not hurt to try a
> new hea
While you're investigating frame alighnment, it might not hurt to try a new
headset. The standard issue Hillborne headsets are not the greatest. I don't
think you need to hunt down an obsolete needle bearing headset, though.
Something with cartridge bearings would be nice. Ask your lbs to face t
William:
You know, I did have an alignment issue: I was hit by a car.
I got a new fork from Rivendell to replace the original, which was bent.
The new fork is for side pull whereas my original was a canti fork.
I actually never thought of this until now, because with the new fork, the
bike has
I ride three largish Rivendells, a road custom (61.5cm), Legolas (62), and
a Quickbeam (60). None shimmy, not one bit. A fourth early Allrounder (58cm
for 26 inch wheels) is super flexible made from Reynolds 753 tubing. It
doesn't shimmy either. The Quickbeam has a front basket and the Allrounde
Years ago some dude on here had a shimmying Rambouillet. He apparently solved
the problem by installing a thick, heavy thorn-resistant tube in his front
tire. At the time, I thought he was a kook, but you never know.
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I'm sorry to hear you are having this experience with your Sam H. I too am a
60cm Sam owner. In fact, I've had two: first an orange single tt canti version,
and now a double tt blue side pull variant. I have never experienced any shimmy
or wobble on either. Actually, my experiencd has always bee
On Thu, 2013-04-25 at 23:25 -0700, john wrote:
>
> I have been very happy with my Sam HIll. But If there were one thing I
> would change about it, I'd ditch the 6% upsloping top tube. This is
> purely from aesthetical considerations. However, I'm wondering now if
> samh doesn't have something righ
I went out today hell-bent on proving a theory: namely, that my new wheel
was the cause of shimmy. Unfortunately, I discovered something else again -
perhaps my theory is incorrect.
I set out with my old wheel and new tire. Saddlebag loaded with the usual
suspects: (mini U-lock, tool kit, a fe
Crosswinds are a different animal. Probably deserve a separate thread.
I was actually working on a blog post about that, following the very windy
ride of a couple weeks ago. Overheard several conversations which included
advice on how to deal with crosswinds that was at best wrong, at worst
On Wed, 2013-04-24 at 22:59 -0700, samh wrote:
> I have two road bikes and they both shimmy, so I sort of feel like a
> crash test dummy for the shimmy phenomena. Wind seems to makes things
> worse as do imperfections in the road surface. My racing bike has
> tried to kill me on occasion. My Riv
I ride where it is very windy (a lot of cross winds) and do get what you
are describing, but its not so much a shimmy as it is an
"unsteadiness"--damn I wish there was some book of bicycle verbiage out
there!
On Thu, Apr 25, 2013 at 1:59 AM, samh wrote:
> I have two road bikes and they both shi
I have two road bikes and they both shimmy, so I sort of feel like a crash
test dummy for the shimmy phenomena. Wind seems to makes things worse as
do imperfections in the road surface. My racing bike has tried to kill me
on occasion. My Rivendell scares me when it starts to shimmy, but it
d
Well... I hate to be pedantic about semantics, but words is all we've got
here.
I think it's helpful if we agree that "Shimmy" is what Jobst describes -
specific oscillation of the front end of the bicycle - "the lateral
oscillation of the head tube about the road contact point of the front
wh
On Wednesday, April 24, 2013 10:29:21 AM UTC-7, Tim McNamara wrote:
>
> Check the spoke tension, trueness and roundness. You can check relative
> tension by plucking the spokes like a harp. In a front wheel all the
> spokes should ring out at the same pitch and should not be a dull thud- it
>
Hilarious that the slang terms "shimmy" and "speed wobble" invite a
discussion of semantics. We may require some more exact language.
On Wednesday, April 24, 2013 4:38:45 PM UTC-5, Tim McNamara wrote:
>
> On Apr 24, 2013, at 3:19 PM, Steve Palincsar wrote:
> > On Wed, 2013-04-24 at 12:42 -0500,
On Apr 24, 2013, at 3:19 PM, Steve Palincsar wrote:
> On Wed, 2013-04-24 at 12:42 -0500, Tim McNamara wrote:
>>
>> Anyway, that Bianchi scared the hell out of me when I was descending
>> the High Bridge in St. Paul in a full aero tuck with my butt hanging
>> way off the back of the saddle (there w
On Wed, 2013-04-24 at 14:33 -0600, PATRICK MOORE wrote:
> What is the difference?
http://www.cyclingtips.com.au/2011/03/speed-wobble-when-the-bike-shakes-its-head/
This is NOT the sort of thing you sometimes read about in BQ reviews,
hands off at a particular speed, that Jan suggested curing with
What is the difference?
On Wed, Apr 24, 2013 at 2:19 PM, Steve Palincsar wrote:
>
>
> This is pretty clearly not shimmy, but rather speed wobble.
>
> --
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Albuquerque, NM
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On Wed, 2013-04-24 at 12:42 -0500, Tim McNamara wrote:
>
> Anyway, that Bianchi scared the hell out of me when I was descending
> the High Bridge in St. Paul in a full aero tuck with my butt hanging
> way off the back of the saddle (there was a little trend for this
> started by Marco Pantani when
OK, the first shimmy anecdote of which I have two from personal experience. I
used to own a Gunnar Crosshairs, which after I stopped racing was set up as a
randonneuse. I rode that bike in the Alps and on PBP. I tried mounting my
Nitto mini front rack on it one day, since it had rack braze-on
Check the spoke tension, trueness and roundness. You can check relative
tension by plucking the spokes like a harp. In a front wheel all the spokes
should ring out at the same pitch and should not be a dull thud- it should be a
fairly bright note. Tension can be checked with a tensiometer, as
Shimmy is typically very speed dependent. When ride-buddy JimG was
diagnosing his issue on a non-RBW bike, it shimmied in a very predictable
pattern when using a front bag, rear load and unloaded. ). They were not
equivalent speeds - 15, 18 and 21 mph IIRC.
It's also extremely center of gra
I dunno... Jan Heine has this to say:
http://janheine.wordpress.com/2012/01/30/the-downsides-of-wide-tires/
Will
On Tuesday, April 23, 2013 9:12:08 AM UTC-5, Tim McNamara wrote:
>
> Wheel balance on bikes is a red herring. The mass differences are too
> small and the RPMs of a bike wheel are t
Well, after removing the tire from the new wheel, remounting the tire to
ensure a perfect seal, and matching up the valve to the label for future
testing, and ensuring that the wheel was perfectly centered in the fork, I
got out for some more testing.
One thing that has changed since my initia
Wheel balance on bikes is a red herring. The mass differences are too small
and the RPMs of a bike wheel are too slow.
I have another anecdote that I don't have time to write at this time (at work,
should be working...) which should help demonstrate this.
On Apr 23, 2013, at 8:35 AM, Will wro
Shimmy is a seemingly mysterious thing, except it isn't really. With shimmy
the bike is acting as a vibrating spring, anchored at the wheel contact patches
with the ground and the rider's contact points. The headset allows the front
end mass (bars, stem, fork, wheel, fender, bar bag, rack, lig
Steve:
I don't currently load the front. I never have, in fact.
On Monday, April 22, 2013 7:58:13 AM UTC-7, Steve Palincsar wrote:
>
> On Mon, 2013-04-22 at 07:32 -0700, john wrote:
> >
> > 1. I got shimmy so infrequently with the original set up that it isn't
> > really worth mentioning (In my
On Mon, 2013-04-22 at 07:32 -0700, john wrote:
>
> 1. I got shimmy so infrequently with the original set up that it isn't
> really worth mentioning (In my opinion). This occured while I sat
> upright going down a long hill at considerable speed. But as I said,
> it seldom occured, and a slight pin
My own experience with shimmy has fortunately been limited and occured
mostly with the '95 custom Road. After years of riding it without any sign
of shimmy, moderate shimmy started happening at about 18-20 mph. I have no
idea what caused it and, after a few weeks, it went away. No major build
chang
On Mon, 2013-04-22 at 08:32 -0400, Peter Morgano wrote:
> To Jims point, is it shimmy or vibration coming from the dynohub?
Vibration from a dynohub doesn't feel like shimmy. It's a very high
frequency, low amplitude buzz. It doesn't make the bike shake or turn
the bars from side to side, and it
To Jims point, is it shimmy or vibration coming from the dynohub? The
latter does happen to me sometimes but only at certain speeds, someone way
smarter could tell why due to harmonics and magnetic polarity. I would
think going back to tje original front wheel would be a good place to
start.
On Apr
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