A bomb-proof three-by-nine should be fine, a fixie would be golden (but bleh). At some point chain lube will be necessary, and later chain replacement might be necessary, but it'll take a while to run though existing supplies if lots of folks are dead. And by that time it might even be feasible to start making new basic components.
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u/Jezbod 2d ago
I like the utility bike to get down the tunnel quicker.