How often do you consume some post-apocalyptic media and people slog it on empty highways or whatever for miles and miles on foot or revert back to fucking horses for some reason? Like I can suspend my disbelief that somehow there's just shittons of fuel laying around everywhere that magically doesn't spoil for decades but even then there's so many scenes where the characters are struggling to walk a distance or take forever and you could literally do it in a quarter of the time on a bike.
They're comparably easy to fix, they don't require keeping a whole ass horse alive, they're fairly abundant everywhere and the fuel is you. It just fucks with my disbelief. What, do these people walk through what remains of the suburbs, looting houses for supplies and just ignore every bike they see?
That's sort of the joke, tho. Nothing works, absent our incredibly energy-hungry infrastructure, in the US. That's why a natural disaster or a public disturbance or a bottleneck in the Suez Canal can result in store shelves hollowed out inside a week.
In an apocalypse, the things that would disappear wouldn't be bicycles but suburbs.