Bike noise, creak, click, creaks, clicks, clicking, pinging sound - help

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Tip for those, like me, who have been experiencing loud crunchy chain noise when pushing hard: Check sprocket wear. It was so worn the chain was having a real hard time meshing and then leaving the sprocket...

New (Steel) sprocket and newish chain - Smooth Ride™

Give it a go.
~£10. Even if it doesn't work, you'll have a spare sprocket.