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Thanks James. Front chainrings hardly used, cassette is new. Checked the chain and not physically possible to drop between two cogs, no stiff links either. I couldn't find any evidence online to suggest why the chain shouldn't work but happy to hear otherwise - believe the inner spacing of the links is the same? I've bought a 10 speed replacement anyway.
It happened within a flash: shifted up a cog on the rear, continued forward on the flat and didn't have time to stop before the drive train locked up and the chain snapped!
Josē
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?