US abstract painter Jackson Pollock, aka 'Jack the Dripper', was a Real Cyclist.
We know this from Ed Harris's portrayal of him in the 2000 film Pollock. In once scene, a drunken Pollock ferries a basketload of beer home, only to crash en route (right), creating an impromptu artwork across the tarmac.
(And, hah, helmet advocates! He's not wearing a helmet and look, he's PERFECTLY OK! Well, they say that drunks fall in a relaxed way.)
Excitingly, new research by academics over at Waltham Forest suggests that Pollock created an early work in north London, presumably while cycling, too.