Mixing 8 & 9 speed components

I would always run a chain appropriate to the cassette, but I don't think there are any real problems about running 8-speed chain and cassette with 9-speed rm and crankrings.
 
8spd rear mech works..

The Shimano RD-M740 eight speed rear derailleurs work fine on 9-speed rear ends also. It's also a much better looking rear dearailleur because it's not all painted. The cage is polished.
 
8 and 9spd compat

I have found running an 8 speed chain through a 9 speed mech with shimano shifters ends up with rub at both ends of the block as the forks are just too narrow and catch. Not a problem with gripshift shifters though with the interim notch positions allowing adjustment on the fly.
 
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