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I have two KMC X10 SL chains that I never ended up using. I got my new bike, which came with a KMC X11 chain (the bike is Specialized Diverge Comp). I am wondering if I can use the X10 chain on this bike?

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    11 speed chains are a bit narrower than 10 speed chains (by about a half mm I think) and the cassette spacing is narrower too. If you have a 11 speed RD (which you do), the cage is also likely a bit narrower. For these reasons, I'd probably just opt for an 11 speed chain.
    – Batman
    Aug 2, 2015 at 1:15

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They will not work at all. Use an 11-speed chain.

If you use the 10spd chain, there is a good chance that it can:

  • Jam in the rear derailleur jockey wheels
  • Increase the friction on the cassette, which will:
  • Increase wear on the chain's side plates, dramatically increasing the chances that the chain will break right in the middle of you hammering up a hill.
  • It will also shift quite poorly.
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