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Chain not catching one cog in a cassette...

Old 05-04-11, 05:01 PM
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Chain not catching one cog in a cassette...

Hello! I'm working on a 1990s Specialized hard rock 7 Speed bike that has had some problems shifting. It shifts up and down fine except for the 2nd cog. On the way up it skips right over it from 1 to 3 and does the same on the way back down. It can't seem to catch. Do I have a worn out cog on that cassette?
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Old 05-04-11, 10:30 PM
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I had a similar problem awhile ago, where I had a cog had multiple bent teeth. The multiple bends caused the chain to jump between cogs, basically "skipping" the cog with the issue. Are there multiple bent teeth on your 2nd cog by any chance?
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Old 05-05-11, 11:58 AM
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Perhaps a silly question, but are you sure it has a 7-speed derailleur? I could see someone replacing the original with a different one. Also, check the cable attachment, if it is attaching to the "wrong" side of the hold-down bolt, that could affect the amount of derailleur movement per click of the shifter.
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