In the last 40 years can you remember an adult lead character choosing to ride a bike as a form of transportation in an American movie or tv series?
If a minor character has a bike and uses it for transportation - it's clear they would like a car but for whatever reason they don't have one. Another character might say to them "Why don't you have a car?" and their reply will be something like "Don't ask."
Last night I watched "Flashdance (1983)". Jennifer Beals plays an 18 year-old who lives on her own and she doesn't have a car. She uses a bike instead.
Premium Rush is a movie in the early 2000s about bicycle delivery drivers in NYC and I think a dude in particular gets some contraband, resulting in basically a driver movie, but with twinks. It looks kinda silly and fun, though was largely poo-poo'd on by critics. I think it was just Americans struggling to comprehend able-bodied people walking to the store or riding a bike outside of a gym.
That's understandable until the MCU introduces a superhero called BikeMan or PedestrianGirl.