On the wild frontier worlds of the galaxy, a traveler may chance to encounter a Motor-centaur.  These are hybrid cybernetic organisms created when the upper body of a humanoid life-form is attached to a modified motorcycle.  Typically, the upper body is also modified for increased strength and durability, allowing the centaur to self-right more easily in the event of a fall.

The largest populations of motor-centaurs are associated with the Fractal Legions of Eris, who typically create them for use as cavalry. 

New Albuquerque in particular is known for its roving bands of these creatures.