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Conference noted::bicycle

Title: Bicycling
Notice:Bicycling for Fun
Moderator:JAMIN::WASSER
Created:Mon Apr 14 1986
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:3214
Total number of notes:31946

2719.0. "Any thoughts?" by COFFEE::SHEINFELD () Fri Jan 28 1994 17:27

    
    I recently upgraded from Shimano 600s to Campy Chorus Ergos -
    and almost think that I've made an excellent move. However,
    the following is driving me crazy:
    
    1. When I try to downshift from 52X(4th cog) to 52X(3rd cog)
       it usually misshifts. All other up and downshifts work - even
       multiple shifts....
    
    2. When I upshift from 42X(4th cog) to 42X(5th cog) it shifts fine,
       but I get a lurch on my pedaling sequence (almost as if it
       loses resistance for 2-3 pedaling cycles.
    
       (I'm counting the cogs from the center of the wheel outwards.)
    
    I've taken the bike back multiple times to the shop - Larry and
    Jeff's in Manhattan (they very good), however, the problem seems
    to continue.
    
    Any thoughts?
    
    Thanks,
     -Rich
T.RTitleUserPersonal
Name		DateLines
2719.1WMOIS::GIROUARD_CMon Jan 31 1994 11:5411
     Rich, do you know what they've tried so far?
    
     It could be a couple of things since it appears to be so isolated.
    
     One thing would be the spacer on either side of that cog. If they
     haven't tried already, I would recommend a different spacer. BTW,
     Shimano spacers can work (so you don't sink any real money into it).
    
     Or it could be the cog. I doubt if it's dish or chain alignment.
    
      Chip
2719.2More Ergo questionsSWAM2::SEYMOUR_DOYou got a pool over there?Mon Jan 31 1994 16:409
    I'm also a new Ergo owner.  I have about 250 miles on it now.  I've
    been playing with the cable tension adjustment near where the old down
    tube shifters used to be.  I can get it so it shifts pretty well in
    both directions by fine tuning.  I still have gears that are noisy. 
    Have you been able to set it up so all 8 gears run silently?  I love it
    when I hit a gear that's totally quiet.  I'm running a 13-23 in back
    and 39-53.  Should I play with spacers too?
    
    Thanks,  Don
2719.3Some ideas for tuning Campag shiftingJURA::PELAZ::MACFADYENjust to be differentTue Feb 01 1994 04:0222
I can think of some possibilities.

First, is the rear derailleur running as close to the block as it can be?
The closer the upper jockey wheel is to the block, the more positive is the
shifting. There's an adjustment screw for this, right where the derailleur
screws onto the frame. If you screw this screw most of the way out, it allows 
the derailleur to 'contract', bringing the upper jockey wheel closer to the 
block. The limit to this adjustment is when, if you back-pedal, that jockey 
wheel starts to touch the block.

Secondly, are the cassette sprockets assembled in the correct relationship
to each other? My Campag cassette came with a very informative leaflet that
included a chart showing the rotational relationship for every permissible
adjacent pair of sprockets.

Finally, if all this fails, I understand that Campag have just released a
new type of cassette sprocket that is, essentially, hyperglide - they have 
those little steps machined into their sides. These new sprockets could cure
your Campag shifting blues.


Rod
2719.4WMOIS::GIROUARD_CTue Feb 01 1994 06:1421
     Rod brings up some other good points. The new sprocket arrangement
     is called ExaDrive. I haven't heard or read anything on it yet, just
     advertisements.
    
     The adjustment barrel on the cable guide is just for some very fine
     tuning. I've never found them to be effective for serious adjustments.
    
     There should be no reason to have clackity gears. And all should shift
     crisply and stay that way fairly consistently (with the exception of
     new cable stretch).
    
     Most of my gears a dead quiet. I only notice real noise when I've
     neglected my duties (chain lube).
    
     One other thing just struck me... I have to squirt a little oil in
     the cable housing at the derailleur section, BB shell cable guides,
     and at the down tube cable guides. They do get dirty from time to
     time and I do notice shift degradation. I always make sure the cables
     are really lube'd too. Regardless of the teflon lining...
    
      Chip