Jimmy Pak, stranded on the far side of the cylindrical sea, runs into a biological robot, or Biot, as Clarke called them. The giant spikes, the drive of Rama, hang in the sky, bolts of electricity still playing around them. Jimmy's crashed sky bike can be seen in the distance, in the process of being dismantled by other Biots. It occurs to me the Rendevous with Rama is the only science fiction novel I know that has a cyclist as hero, albeit a sky cyclist.