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"For the sciences, the way to change science's perception of things is to wait until all the old farts have died off."
- Larry Niven

Two-Wheeled Car  
  A small passenger vehicle with two centerline wheels.  

It had a rather cramped passenger compartment.

He picked out a car, still some distance away, but approaching at headlong speed. It braked, and came to a stop alongside them.

It was a small affair, ovoid in shape, and poised on two centerline wheels…

As the glassite hood was being swung back into place...

From The Roads Must Roll, by Robert Heinlein.
Published by Astounding Science Fiction in 1940
Additional resources -

Compare to the Two-Wheeled Ground Car from Doc Smith's First Lensman, published in 1950.

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Additional resources:
  More Ideas and Technology from The Roads Must Roll
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to The Roads Must Roll
  Tech news articles related to works by Robert Heinlein

Two-Wheeled Car-related news articles:
  - C1 - The Gyro-Stabilized Two-Wheeled Ground Car
  - Lit Motors C-1 Gyro-Stabilized 2-Person Motorbike

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