Thread: RD running roughly on lowest gear
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Old 07-09-12 | 10:17 AM
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ThermionicScott
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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 you've exceeded your rear derailleur's capacity -- have you switched from a double to that triple, or installed a cassette with a much larger cog than stock? You may need to install an RD with a longer cage.
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