One of those guys is on a bike with safety levers. Poser. The other guy might be legit.
I've read that both Eric Clapton and Jeff Beck were amateur bike racers in their teens. In the 1980s, Clapton picked up a Cinelli Supercorsa from the factory. Don't know what Jeff Beck's bike was.
Ginger Baker had planned a career as a professional bike racer, but then he happened to sit behind a drum set at a party and discovered that he could play.
Edit: closer to the All Mod Cons era, here's Kraftwerk: