Old 05-25-17, 03:55 PM
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As noted, this can be caused by a worn chain or a worn sprocket. I'd pull the wheel and look very carefully at the small cog to determine if the teeth are hooked or assymetrical due to excessive wear. A worn chain can change the spacing between the leading edges of the cog teeth and then when a new chain comes along it will only engage completely with one tooth at a time, causing skipping.
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