Anons argue in comments
A related question: why is the "big tough guy" image a guy in a truck?
Like, you push a pedal with your foot to make your vehicle go vroom vroom. A granny could do that.
Surely a tough guy is a guy who is straining huge muscles to make a bike hit 50 km/h. A skilled guy is one who can maneuver his bike down a narrow mountain-bike track.
Imagine looking back in history and seeing a dude being carried around in a sedan chair and thinking that was the ideal image of masculinity, rather than the surely jacked dudes carrying him.