This is, obviously, the death trap from "A RIDDLE A DAY KEEPS THE RIDDLER AWAY." In the script it's referred to as a "drive shaft". That term makes me think of a very different piece of machinery inside a car. Is it an accurate term for the wheels that the Duo are strapped to? Just what are these contraptions?
"I'm half-demented with whimsical outrage!"
-- The Joker, in a line cut from "The Joker's Epitaph"