The "no bicycles in the apocalypse thing" gets even more ridicolous when you consider the amount of overlap it has with gunsmithing

Historically, there's a lot of overlap of companies that did bicycles but also guns. It's basically the same "small scale" metallurgy that makes it work. As I've noted too many times before it's odd that in every apocalyptic scenario nobody ever thinks to use a bicycle, it becomes especially egregious once somehow post apocalyptic gunsmithing enters the mix and still no bicycles. That's the same skillset!