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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 07-27-05, 12:46 AM   #1
Sincitycycler
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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
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Old 07-27-05, 04:44 AM   #2
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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.
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Old 07-27-05, 12:16 PM   #3
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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.
WTF???
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Old 07-27-05, 12:21 PM   #4
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How old are your cables? They might just need replacing...
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Old 07-27-05, 12:55 PM   #5
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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).
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Old 07-27-05, 01:23 PM   #6
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How old are your cables? They might just need replacing...
27 years old
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Old 07-27-05, 02:41 PM   #7
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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
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Old 07-27-05, 03:05 PM   #8
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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.
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Old 07-27-05, 03:41 PM   #9
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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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