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Aero plz.
More seriously, it's been fine all year until now which suggests there is a "problem".
The only thing I can think of, is that the chain has developed lateral play,
Having said that, the bottom sprocket isn't used at all (as I haven't sorted the RALTech) and only the top six get any real use.
Scilly.Suffolk
@umop3pisdn
Chainguide of some sort?