• I'm running 10 speed Centaur carbon levers with an 11 speed Record rear derailleur without any issues. It's a short cage derailleur if that makes any difference.

    I think I've read somewhere that the new 11 speed medium cage derailleur only works with the 11 speed Centaur levers, as I discounted getting one of those to allow me to use a larger cassette on another project.

    Hope you get it sorted.

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