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  1. #1
    Senior Member
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    Aug 2010
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    04' Giant Cypress ST
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    Highish speed and bumpy = autoshift?

    So I was pedaling along with minimal effort at probably about 80 or 85 rpm going about 20 mph and the path got bumpy and wham it my rear derauler shifted into a smaller cog. Happened twice. Is that normal for bumpy areas? I'm running all shimano 105 components except for the rear derauler which is a cheesy plastic suntour model. I'll allow that this may also be the culprit.

  2. #2
    Senior Member Torchy McFlux's Avatar
    Join Date
    Sep 2007
    Location
    Vancouver
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    NOYB
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    Suntour and Shimano drivetrain components generally don't work very well together. Install a Shimano derailleur from the same era as the shifters.

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