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@Dammit
Adjusting the rear mech - key to this seems to be to adjust it so that the drivetrain doesn't actually work when the bike is in the stand, but does when there is weight on the bike which causes the suspension to sag and increases tension on the chain.
i.e. the mech, when the bike is in the stand, is too close to the cassette, the top teeth of the upper jockey wheel hit the tips of the largest sprockets teeth. This doesn't happen when you are on the bike, and it no longer chatters in second to largest sprocket.
Did Brighton-Eastbourne on the SDW today, needless to say the rear brake was fine after I got some heat into it, but it'll likely be shocking by tomorrow. Hopefully new pads turn up before I ride the bike again.
Also, a bike with 20" wheels just turned up.