Only partly true. The trike is arguably heavier and more complex than a bike but a quad is only trivially heavier and more complex than a trike. Trikes are slower than bikes not because they are heavier but because they will roll over if they attempt to corner at speeds that are commonplace for bicycles. A quad is somewhat more resistant to rolling over than a trike of the same track and therefore would be faster but not as fast as a bike. On a straight run however both trikes and quads could be faster than a bike and if width were not an issue and the track extended to say 56" or 58" both trikes and quads would be much faster overall than a bicycle as their cornering speeds would be much higher than anything one could attempt on only two wheels.

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