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  1. #1
    Senior Member Sincitycycler's Avatar
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    ...on my old high school 1978 Peugeot Allege that I dug out of storage to be my beater. Stem mounted shifters. Solution? Thanks, Ken

  2. #2
    Senior Member Retro Grouch's Avatar
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    Assuming that your bike shifts normally the rest of the time, most likely you have enough frame flex to cause your derailleur to shift.

  3. #3
    Senior Member Sincitycycler's Avatar
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    Quote Originally Posted by Retro Grouch
    Assuming that your bike shifts normally the rest of the time, most likely you have enough frame flex to cause your derailleur to shift.
    WTF???

  4. #4
    |+|+|+|+|+|+| * jack *'s Avatar
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    How old are your cables? They might just need replacing...

  5. #5
    Ouch!!!
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    Quote Originally Posted by * jack *
    How old are your cables? They might just need replacing...
    Or a bit more (or less) tension, depending on which way it's shifting (up or down).
    "Do, or do not - there is no 'try'."
    Yoda

    RIP sydney.

  6. #6
    Senior Member Sincitycycler's Avatar
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    Quote Originally Posted by * jack *
    How old are your cables? They might just need replacing...
    27 years old

  7. #7
    Senior Member jazzy_cyclist's Avatar
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    If this were a relatively new bike, I'd say it was just a problem with cable tension just requiring a simple adjustment. But 27 years

  8. #8
    Embrace the weirdness. primaryreality's Avatar
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    Try tightening the D-ring on your shifting levers. Worked when I had the same problem on my 27-year-old bike.

  9. #9
    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by Sincitycycler
    ...on my old high school 1978 Peugeot Allege that I dug out of storage to be my beater. Stem mounted shifters. Solution? Thanks, Ken
    Tightening the friction screw in the shift lever is the first thing to try.

    Sometimes this is also an issue with cable friction near the bottom bracket.

    See: http://sheldonbrown.com/autoshift.

    By the way "Allege" is not a model designation, it just means "light weight."

    Sheldon "Autoshift" Brown
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