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Old 08-04-14 | 09:26 AM
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ThermionicScott
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Joined: Aug 2011
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From: CID

Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)

Sounds like the rear derailleur is slightly out of adjustment, and you're flexing the frame enough to cause it to autoshift.
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