The road chainsets officially no, in practice yes.
I have an Ultegra FC-6800 on one of my bikes, running 10 speed.
And here’s the proof ;-)
Thanks. I had spotted that it was a mix of 11/10, but wasn't sure if this was a general rule!
@Brain-Stew started
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The road chainsets officially no, in practice yes.
And here’s the proof ;-)