One of my favorite books as a kid was about a man who rode his bicycle into a crack in the road; the crack keeps getting larger and larger until the man finds himself riding through a giant ravine underneath the road. I think there may have been a plant or vine that grabbed his bicycle tires and dragged him into the ravine. I think the drawings were in black and white.

I was born in the early 1980s so the book was probably published in the mid-late 70s or early 80s, less likely 1960s although it was sort of psychedelic.