Chain skips gears

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Chain skips gears

Scooter
Why does my chain jump gears in the middle of the rear cog when I am not shifting at all? What adjustment do I make to correct this?
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Re: Chain skips gears

SueReimer
Ooh!  I love playing this game.

Here is my vote:  worn rear cassette.  Look at the shape of the cogs and then google some images to see if yours are shark-finned.  My second guess is a worn or stiff chain.  I think both of those are replacement issues, not adjustments.
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Re: Chain skips gears

Scooter
They look like Pirahna Teeth to me Piranha Cassette