I'd be surprised if the chainring was compatible with 10 speed chain.
It is, I'm using 10-speed chain with a pair of Alfine rings as the synchronising drive on my tandem.
the difference between 9 speed and 10 speed chains is the outer width
^this
@gbj_tester started
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It is, I'm using 10-speed chain with a pair of Alfine rings as the synchronising drive on my tandem.
^this