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Old 08-02-20, 12:40 PM
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canopus 
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Location: Kingwood, TX
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Bikes: 1985 Cannondale SR300, 1985 Cannondale ST400, 1984 Trek 760, 1984 Trek 610, 1984 Trek 720, 1981 Trek 710, 1979 Trek 710, Gary Littlejohn Cruiser, BMX

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Pictures would help. How is the chain length? Do you think these are the original parts or were they maybe changed out during its life? Is it a cassette or a freewheel? Maybe a larger rear tooth count than designed for the derailleur? or smaller derailleur than designed for the tooth count? I have had the b screw when screwed in actually miss the mount step that is designed to sit against so screwing it in did nothing. I can't really see a suntour derailleur not being able to handle a 6s unless something is out of alignment or bent or broken.
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1984 Cannondale ST
1985 Cannondale SR300
1980 Gary Littlejohn Cruiser
1984 Trek 760
1981 Trek 710
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