Countersteering is used by
single-track vehicle operators, such as
cyclists and
motorcyclists, to initiate a turn toward a given direction by momentarily steering counter to the desired direction ("steer left to turn right"). To negotiate a turn successfully, the combined
center of mass of the rider and the single-track
vehicle must first be leaned in the direction of the turn, and steering briefly in the opposite direction causes that lean.
[1] The rider's action of countersteering is sometimes referred to as "giving a steering command".
[2][3]: 15
The scientific literature does not provide a clear and comprehensive definition of countersteering. In fact, "a proper distinction between steer torque and steer angle ... is not always made.