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  1. Simple-Maybe-7089 on

    I would think this is a derailleur issue in that it’s not pulling the chain tight.

  2. your top pulley isnt align with the cog. if u do not know how to set derailleuer to proper index, take it to LBS. it is a little bit complicated to explain on text. u can find online guide in Youtube to DIY this at home but u need to be patient

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