Re: [RBW] Speed wobble

[James Copp]

I thought it was likely weight distribution.  I ride with my saddle pretty
far back and if I cary anything, then it's in a saddle bag.

On Tue, Mar 24, 2020 at 9:04 AM Peter White  wrote:

> A rear rack on a Peter Mooney 58cm touring frame. Frame designed for low
> rider front rack, not the 30 lbs in front of the steering axis routine.
>
> PJW
>
> On Tue, Mar 24, 2020 at 8:46 AM 'Dave Small' via RBW Owners Bunch <
> rbw-owners-bunch@googlegroups.com> wrote:
>
>> Hi Peter,
>>
>> Was your racktop bag on a front rack or a rear rack, and what kind of
>> bike was it (I'm thinking about trail with that latter question).  Thanks.
>>
>> Dave
>> Boston/Indy
>>
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>> 
>> .
>>
>
>
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Re: [RBW] Speed wobble

[Peter White]

A rear rack on a Peter Mooney 58cm touring frame. Frame designed for low
rider front rack, not the 30 lbs in front of the steering axis routine.

PJW

On Tue, Mar 24, 2020 at 8:46 AM 'Dave Small' via RBW Owners Bunch <
rbw-owners-bunch@googlegroups.com> wrote:

> Hi Peter,
>
> Was your racktop bag on a front rack or a rear rack, and what kind of bike
> was it (I'm thinking about trail with that latter question).  Thanks.
>
> Dave
> Boston/Indy
>
> --
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> 
> .
>


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Re: [RBW] Speed wobble

['Dave Small' via RBW Owners Bunch]

Hi Peter,

Was your racktop bag on a front rack or a rear rack, and what kind of bike 
was it (I'm thinking about trail with that latter question).  Thanks.

Dave
Boston/Indy

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Re: [RBW] Speed wobble

[Peter White]

I did an experiment some years ago. A customer was complaining about the
bike having a shimmy after he moved his saddle to the rear for a better
fit. He also kept a racktop bag filled with all sorts of stuff. This got me
to thinking, a state which is fraught with danger.

On my own touring bike, which also had a racktop bag, I put a case of 10
SRAM chains at the rear of the bag and filled up the front with a light
jacket to keep the chains at the rear. My bike shimmied badly. I stopped
and moved the chains to the front and put the jacket at the rear. No more
shimmy. I then vowed never to carry that many chains at the rear of my
racktop bag again.

Anyway, weight distribution does seem to contribute to the problem. It's
interesting that large racing frames seem to be more inclined to
shimmy than small frames. And if you look at the position of the saddle
relative to the two hubs it's going to be much closer to the rear than on a
small frame, so the weight distribution is further to the rear.

PJW

On Mon, Mar 23, 2020 at 10:01 PM Friend  wrote:

> Does anyone have suggestions for correcting a wobble I get when I ride
> with no hands?
>
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> .
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Re: [RBW] Speed wobble

[Steve Palincsar]

Reminds me of a Henny Youngman joke: The patient says, "Doctor, it hurts 
when I do this." "Then don't do that!"


Or you could try clamping the top tube between your knees.

On 3/23/20 10:01 PM, Friend wrote:
Does anyone have suggestions for correcting a wobble I get when I ride 
with no hands?



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Re: [RBW] Speed Wobble on Big Rivs?

[Goshen Peter]

What are your current bikes? Just curious how you are getting wobble at
only 18mph with a rear load.

On Mon, Nov 24, 2014 at 12:39 AM, Lovie Cashew cashewencount...@gmail.com
wrote:

 Currently in the market for a lugged steel roadbike for commuting. I only
 use a rear rack with a basket containing 15lbs or so of stuff. Current (and
 past) bikes get that front end lateral shimmy/wobble at 16-18mph or faster
 when loaded with 200lb me and my gear on it when I ride with no hands off
 my drop bars. Super annoying, and problem only goes away when I put hands
 back on ths bars or clamp the top tube with my legs. And yes I have tried
 tightening my headset and stem down (amongst many other tactics). According
 to RBW, Im sized in the low 60's of their double top tube bikes.

 MY QUESTION IS: Any similar or larger Riv Riders get the front of the bike
 shaking when loaded rear only? Not looking to change how I ride, just want
 to know if buying a double top tube bike will cure this problem.

 Many Many Thanx !!!

 A-

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Re: [RBW] Speed Wobble on Big Rivs?

[Patrick Moore]

I get shimmy no-hands starting at about 15 mph on both my 2003 custom and
my Ram; both 58 c-c (32 mm and 29 mm tires respectively). Not on my (very
narrow and light tired) '99 custom.

On Sun, Nov 23, 2014 at 10:39 PM, Lovie Cashew cashewencount...@gmail.com
wrote:

 Currently in the market for a lugged steel roadbike for commuting. I only
 use a rear rack with a basket containing 15lbs or so of stuff. Current (and
 past) bikes get that front end lateral shimmy/wobble at 16-18mph or faster
 when loaded with 200lb me and my gear on it when I ride with no hands off
 my drop bars. Super annoying, and problem only goes away when I put hands
 back on ths bars or clamp the top tube with my legs. And yes I have tried
 tightening my headset and stem down (amongst many other tactics). According
 to RBW, Im sized in the low 60's of their double top tube bikes.

 MY QUESTION IS: Any similar or larger Riv Riders get the front of the bike
 shaking when loaded rear only? Not looking to change how I ride, just want
 to know if buying a double top tube bike will cure this problem.

 Many Many Thanx !!!

 A-

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though I give my body to be burned, and have not money, it profiteth me
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Re: [RBW] Speed Wobble on Big Rivs?

[Jim Bronson]

I have two Rivendells now, a custom and a Redwood, both in the 68cm
range. I* get no shimmy whatsoever and I usually ride with 5-15 lbs in
the back.

*the previous owner said my custom did shimmy at higher speeds, i.e.,
35+.  I have never experienced it at any speed or with any load.  I
have had it going as fast as 55mph riding down passes in Colorado
although that's somewhat atypical, usually terminal velocity is mid to
upper 30s in Central Texas.

On Sun, Nov 23, 2014 at 11:39 PM, Lovie Cashew
cashewencount...@gmail.com wrote:
 Currently in the market for a lugged steel roadbike for commuting. I only use 
 a rear rack with a basket containing 15lbs or so of stuff. Current (and past) 
 bikes get that front end lateral shimmy/wobble at 16-18mph or faster when 
 loaded with 200lb me and my gear on it when I ride with no hands off my drop 
 bars. Super annoying, and problem only goes away when I put hands back on ths 
 bars or clamp the top tube with my legs. And yes I have tried tightening my 
 headset and stem down (amongst many other tactics). According to RBW, Im 
 sized in the low 60's of their double top tube bikes.

 MY QUESTION IS: Any similar or larger Riv Riders get the front of the bike 
 shaking when loaded rear only? Not looking to change how I ride, just want to 
 know if buying a double top tube bike will cure this problem.

 Many Many Thanx !!!

 A-

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Re: [RBW] Speed Wobble on Big Rivs?

[Clayton.sf]

A needle bearing headset often cures a shimmy. Miche primato is cheap enough to 
give it a try.

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Re: [RBW] Speed Wobble on Big Rivs?

[stonehog]

My 59 Hilsen just took on a mean shimmy when I removed the front bag and put a 
basket on a Mark's Rack in the back. Carrying about 3-5 lbs shimmied nastily 
no-handed, and even shook a bit with hands on bars. I just had the headset 
replaced from a Tange ball-bearing to a Miche needle top and bottom, and this 
seemed to not help at all. I had some mild shimmy before, BTW. I also noticed 
that as I lean forward and put more weight to the front of the bike, the shimmy 
calms.  It was bad enough that I immediately removed the offending rear rack 
and basket and put my front bag on again. Shimmy, vanquished. 

Before - major shimmy: http://flic.kr/p/pS6tUc
After - no shimmy: http://flic.kr/p/ntqSPz

I recall a post a few yrs back from a fellow who experimented with different 
weighting in front and back. I believe he found that in his case having any 
weight in the back caused the shimmy.  

Brian Hanson
Seattle, WA

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