Originally Posted by
Aeroplane
Depending on the chain, usually a 9-10 speed chain is too narrow for a 3/32" cog. 8-speed chain works well on a 3/32. Plus, 9+ speed chains have a reputation for being flimsy (to me).
I believe you are correct with 8 vs 9/10-sp chains. Sheldon notes that 8-speed chains are better for this application. (But increasingly rare.) Same logic should hold however... (bushing vs bushingless chain distinction.)