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Just to check, you're suggesting my 11sp chain should work on a 9sp cassette (albeit stuck in one gear)
I can't guarantee and you'll need to do a bit of Google research but I think so. This website suggests that inner width is the same.. https://bike.bikegremlin.com/1220/1-bicycle-chains-compatibility/
Multi speed chains from 9 to 12 speeds have inner width of 11/128″
(2.18 mm).
spinnnout
Good point, so I'd be running in ERG mode, and not shifting, she could do what she wants if we set it up with a 9speed cassette. This would a cheaper way to find out she won't use it than converting her bike to 11speed! Good news, this is the kind of insider info I came here for.
Just to check, you're suggesting my 11sp chain should work on a 9sp cassette (albeit stuck in one gear)