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I could run 8speed cassette with 9 speed XT mech, and for example an ultegra compact, with an 8spd chain and it would work fine?
Very unlikely to cause trouble. In theory, a wide chain can be unhappy going through a narrow RD pulley cage but you'd probably have to be running 7-speed chain in an 11-speed RD for it actually to happen.
gbj_tester
@zooeyzooey
I imagine running the wider chain would be fine though? So I could run 8speed cassette with 9 speed XT mech, and for example an ultegra compact, with an 8spd chain and it would work fine? Front mech is friction, rear is indexed or friction, but mostly run it indexed on current set up.
Could always go 10speed all round and just set bar ends to friction, but I'm a bit scared of thin, expensive chains.