I’ve read that the inner dimension between chain plates are 11/128” on 9-12 speed. The dimension is 3/32” on 8 and less multi-speed chains.
Not really believing everything I’ve read, so maybe no one should believe this, I measured some excess pieces of 8 and 9 speed chains. Taking just an internal measurement, and also individual (plate thickness and overall), with digital calipers, a 9 speed chain is less than 3/32. It is running around .085”.
This isn’t to say that .008” will cause an issue as I’m running a 9 speed chain with a 7 speed Sachs Aris freewheel without problems. And I can’t imagine a similar width aluminum chainring would fair worse.
John