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@ketsbaia
So it looks like I have an impossible ratio. I've done the big/big/no derailleur and the small chain ring is unusable (i.e. derailleur bends back on itself so the chain touches itself) from about the third largest cog down. I'm now down to adding just one link between the two quicklinks (which I'm not entirely happy with), but big ring big cog pulls the derailleur practically straight. I haven't tried this yet as I still don't know whether that will be any good in the small cog.