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I can’t imagine a ten speed cassette and 11 speed chain were happy together.
Stridsland (can’t remember their forum name) has been posting stuff on Insta that suggests otherwise. Think the internal width is the same but the external is smaller on 11 speed chain so it actually runs smoother and quieter on an 10 speed cassette.
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Yeah this is what lead me to do it. Had an 11 speed change spare, correct length.
Thanks for your thoughts guys, ultimately the frame is off to be repaired and I'll fir a 10 speed chain and replacement mech, but knocked my confidence in home maintenance and wondered if anyone had an idea what could've happened.
I can’t imagine a ten speed cassette and 11 speed chain were happy together.
How worn out are the chainrings and cassette?
Did the chain get stuck and you kept pedalling leaving only the mech and mech hanger to give way?