Originally Posted by Valker
Technically, any single track vehicle must lean to turn. Since a single wheel vehicle can't have the front wheel turn opposite to 'outtrack' for the lean, it must be accomplished by rider body movements, the computer, or a combo.
Just because there's only one wheel doesn't mean it doesn't counter-steer to initiate the lean. "Out-tracking" is just steering outwards from the intended turn to initiate or deepen the lean. That's exactly how one-wheel vehicles turn. The contact patch is moved away from the turn momentarily in order to roll the vehicle and rider towards the turn.
Even if there were gyros to keep the vehicle upright, you'd still "out-track" to move the combined CoG (of vehicle and rider) to the inside of the turn.