I have a bike with 10 speed front derailleur and chainrings. The cassette, rear derailleur and shifter will all be 11 speed. Can I run an 11 speed chain on this? Everything is Campagnolo.
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Very likely yes this will work fine. The main risks are
Though I've successfully used 9 speed chain on what started as a 5 speed triple chainset, and its still working fine (though its friction shifting which may disguise some shifting issues.)