Can you move the chain up and down with your finger (try the part of the chain between cog and chainwheel).
It sounds like it is too tight, so you would need to move the wheel forward very slightly.
@kerley started
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Can you move the chain up and down with your finger (try the part of the chain between cog and chainwheel).
It sounds like it is too tight, so you would need to move the wheel forward very slightly.