I switched my 10 speed cross bike to 9 speed, but left the 10-speed crankset alone. So I had a 9 speed chain, cassette, derailleurs and shifters with a 10 speed double crank. It worked, but the chain would try to climb onto the big ring if i had it in the small / small combo. I switched to a 10-speed chain, and now all the combos are usable.
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