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To be more specific, my bike come with Shimano Sora 9 speed group set. I'm using a KMC X9 9 speed chain.

I studied quite a lot of websites. They claim that chainrings are compatible with any speed of cassettes.

Are there compatibility problem with existing components if I put on Shimano 105 11 speed chainrings?

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    In general, 11 speed systems use narrower chains, sprockets and clusters than 10,9,8, ... speed systems. So the 9 speed chain will still work with an 11 speed ring. Curious though: why the plan for a miss-matched group set?
    – andy256
    May 14, 2015 at 10:43
  • A more narrow ring will fit in a larger chain. But wider ring will not fit in a more narrow chain. Ideally you match the size.
    – paparazzo
    May 14, 2015 at 15:51

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Basically, so long as the front derailleur is wide enough to carry a 9 speed chain that you're using (so a 9 speed front derailleur would work) without problems, you'll be fine.

So, go for it, provided they'll fit (i.e. the bolt pattern + BCD matches).

As for mismatching the chainrings, chances are these are the cheapest ones on the market now. My road bike, for example, runs a Shimano 105SC groupset (7 speed) and I'm going to have to replace the chain rings with things that are "10/11 speed" eventually.

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