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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

1030.0. "C-Record auto-shift" by KUDZU::ELLIS (John Lee Ellis - assembly required) Wed Mar 08 1989 12:40

    My C-Record shifter (and rear derailleur) will now shift for
    itself (climbing out of the saddle).  I've cleaned the shifter
    mechanism with alcohol, which helped for a day or so, but now
    the problem's back.
    
    Do any of you have similar experience?  Remedies?  Is there
    another note that's gone through this already?
    
    -john
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1030.1Is it frame flex and not shifter?CUJO::LEBLANCuppers are downers and downers are uppersWed Mar 08 1989 14:1710
>    My C-Record shifter (and rear derailleur) will now shift for
>    itself (climbing out of the saddle).  

	What frame is this derailleur on?  Some friends have had this problem
on Vitus frames.  Especially if the frame is large or they are strong sprinters
or hill climbers.  It is due to flex in the rear drop-out/chain stays.  Flex
in this area of the frame means that the derailleur will not stay aligned.

Steven Le Blanc
1030.2SLX stiff enough?KUDZU::ELLISJohn Lee Ellis - assembly requiredWed Mar 08 1989 14:3310
>	What frame is this derailleur on?  Some friends have had this problem
>on Vitus frames.  Especially if the frame is large or they are strong sprinters
>or hill climbers.  It is due to flex in the rear drop-out/chain stays.  Flex
>in this area of the frame means that the derailleur will not stay aligned.

    One might indeed suspect frame-flex.  Well, it's a Columbus SLX 52cm
    De Rosa frame... so you'd think it would be small & stiff enough.
    Might that still be the problem, though?  Should I spin more on
    hills?
                      -john
1030.3Try thisBANZAI::FISHERRdb/VMS DinosaurWed Mar 08 1989 14:3915
    Didn't I tell you that I have a pair of C-record shifters that did
    that and are now sitting in a drawer because I could not solve
    the problem?  I also have a pair which works properly -- they must
    have noticed their predecessors' predicament.
    
    There are 2 brass washers between the friction thing and the shifter
    arm.  They are not quite flat.  I think it makes a difference how
    they are oriented with respect to each other.  In the first case,
    nothing worked, for the second pair, I think I put their concave
    faces toward each other.
    
    Maybe its fatigue?  They would rather sit in a drawer than look
    forward to a spring-summer&fall of double centuries.
    
    ed
1030.4ok, going to try itKUDZU::ELLISJohn Lee Ellis - assembly requiredWed Mar 08 1989 15:359
    Magnifico ... credo.  I've walked over to the bike, and sure
    enough, there are two silver-colored (not brass) concave washers
    on the outside of the lever, and they were oriented the same way
    - now they're facing each other.  
    
    Time for a lunch ride to test this out.  These shifters may have
    to bear the brunt of merciless riding yet!  :-)
    
    -john