out of saddle shifting

dw wrote:
> when climbing out of the saddle, I find chain shifting to a smaller
> rear cog without input from the campy ergo shifter; pull it back up,
> and it stays put for seated pedaling, but slips back when I stand up;
> any thoughts?

Flexing frame, especially around the BB area.
--
Perre

You have to be smarter than a robot to reply.

dw <[email protected]> wrote:
> when climbing out of the saddle, I find chain shifting to a smaller
> rear cog without input from the campy ergo shifter; pull it back up,
> and it stays put for seated pedaling, but slips back when I stand up;
> any thoughts?

Classic case of autoshifting. See:

http://www.sheldonbrown.com/derailer-adjustment.html#autoshift

Art Harris

Dw wrote:
> when climbing out of the saddle, I find chain shifting to a smaller
> rear cog without input from the campy ergo shifter; pull it back up,
> and it stays put for seated pedaling, but slips back when I stand up;
> any thoughts?



Check the "autoshifting" article on Sheldon Brown's site:

<http://sheldonbrown.com/autoshift.html>

Sometimes fixed by cleaning the area & cable under the Bottom Bracket
guide and/or applying a bit of grease on the cable where it passes
through the guide.

As indexing distances become closer the problem is magnified. Strong
riders and/or flexible frames also magnify this.



--

"Per Elmsäter" <[email protected]> wrote in message news:<[email protected]>...
> dw wrote:
> > when climbing out of the saddle, I find chain shifting to a smaller
> > rear cog without input from the campy ergo shifter; pull it back up,
> > and it stays put for seated pedaling, but slips back when I stand up;
> > any thoughts?
>
> Flexing frame, especially around the BB area.

Man, that's a lot of flex.

Original poster: What bike/frame are you using, 8/9 or 10 speed?

It can happen.......

I saw Ken Carpenter (6'6" 240 World class trackie racer) go down hard in
front of me when he was out of the saddle sprinting on a 60+ cm ti bike


On 6/3/04 4:20 PM, in article
[email protected], "Richard Adams"
<[email protected]> wrote:

> "Per Elmsäter" <[email protected]> wrote in message
> news:<[email protected]>...
>> dw wrote:
>>> when climbing out of the saddle, I find chain shifting to a smaller
>>> rear cog without input from the campy ergo shifter; pull it back up,
>>> and it stays put for seated pedaling, but slips back when I stand up;
>>> any thoughts?
>>
>> Flexing frame, especially around the BB area.
>
> Man, that's a lot of flex.
>
> Original poster: What bike/frame are you using, 8/9 or 10 speed?

dvwlt-<< when climbing out of the saddle, I find chain shifting to a smaller
rear cog without input from the campy ergo shifter; pull it back up,
and it stays put for seated pedaling, but slips back when I stand up;
any thoughts? >><BR><BR>

Perhaps the flex of the frameset is stronger than the right ergo shift spring.
In other words, perhaps you need a right ergo OVH, with new shift springs.

Peter Chisholm
Vecchio's Bicicletteria
1833 Pearl St.
Boulder, CO, 80302
(303)440-3535
http://www.vecchios.com
"Ruote convenzionali costruite eccezionalmente bene"

[email protected] (Qui si parla Campagnolo ) wrote in message news:<[email protected]>...
> dvwlt-<< when climbing out of the saddle, I find chain shifting to a smaller
> rear cog without input from the campy ergo shifter; pull it back up,
> and it stays put for seated pedaling, but slips back when I stand up;
> any thoughts? >><BR><BR>
>
> Perhaps the flex of the frameset is stronger than the right ergo shift spring.
> In other words, perhaps you need a right ergo OVH, with new shift springs.
>
> Peter Chisholm
> Vecchio's Bicicletteria
> 1833 Pearl St.
> Boulder, CO, 80302
> (303)440-3535
> http://www.vecchios.com
> "Ruote convenzionali costruite eccezionalmente bene"

Yes, I think this is right, and may be related to the fact that the
sound of the right shifter recently went form an audible click to
basically silent operation when changing to a bigger rear cog.
Wondering whether the overhaul is hard to do, and what parts you would
expect to need. Also, existing is '96 Chorus -- is it critical to
match this?