When
General Grievous's droid army on
Utapau was uncovered by
Jedi Master Obi-Wan Kenobi, the Separatist general attempted to escape in a wheel bike -- a hoop-shaped rolling vehicle equipped with mechanical legs that could be used in an alternate walking mode. The leaping capabilities of these legs proved useful in navigating the cliffs and crags of the cavernous Utapau terrain.
Since stopping Grievous could bring an end to the Clone Wars, Obi-Wan was relentless in his pursuit of the cyborg general as the Jedi gave chase astride a giant Utapaun dragon named Boga. Kenobi was able to keep pace with Grievous and leapt aboard the wheel bike, trying to wrest control away from the general. The bike tottered out of control, spilling its occupants onto a nearby landing platform before tumbling into the sinkhole abyss.