A human-powered vehicle comprising a structural frame, two front wheels mounted
to a forward portion of the frame for rotation, a seat secured to the frame, the
seat positioned between the front wheels and adapted to pivot about a seat pivot
axis, and a steerable rear wheel mounted to the frame behind the seat and defining
a rear wheel kingpin axis, the rear wheel operably linked to the seat such that
pivoting of the seat about the seat pivot axis causes pivoting of the rear wheel
about the kingpin axis to steer the vehicle.
