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@Josē
I had a plan to mod some 7900 downtube shifters to 11-speed and run 9000 like on this bike:
https://www.cxmagazine.com/breadwinner-cyclocross-builds-nahbs-2014
However, haven't seen a chainset come up with numbers outside the recall. It would be pretty daft to buy used cranks with serial numbers affected by the recall wouldn't it? Be interested to know what others make of the situation, as it writes off second hand groupsets of that vintage