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Yeah could be any of those things - jockey wheel still attached to the cage but the inner plate sheared just below the bolt hole. Seems one to file under "one of those things". Especially with used parts. I'd back myself to spot an obvious issue but a weakened plate maybe not.
Shifting (with DT shifters) before it let go was nice though! I have a replacement 7900 rear mech already and some fresh jockey wheels. Will take my time setting it up and run it through the gears on the stand once the frame is back to check and maybe get some closure.
Thanks for all the comments, much appreciated
Josē
Jockey wheel bolt backed out and hit spokes? Thats if the obvious and the cage didn't just hit the spokes, that never ends well. Or inner plate already weakened and just decided today was the day.
Heard the 11's chain on 10s cass thing before, imagine theres mostly a difference in front mech shift, chain being a bit narrow.
10s 5800/6800 generation wasn't shimano's finest. Threw £££ cables at bikes with those groups this week to make them even vaguely shift well, total mushy PITA.
Or just a foreign object jumped in there. Recently sold a decent used bike, fitted mudguards expertly well to the bike. Customer got their kid to ride it back as they weren't confident. 1 hour later, lost looking customer and fairly angry looking customers partner as to why this bike was all mangled.
Honestly looked like kid had ridden it and thrown a stick in the wheel. Such destruction. Once they realized it was genuinely the kid that did it, it was all very apologetic and some wine ended up in my fridge, all good.