Deathsport (1978)

One thousand years into the future, after the Great Neutron Wars, the world is divided into desert wastes and isolated city-states. Lord Zirpola captures Kaz, a notorious motorcycling Desert Ranger, to fight to the death in his game, Deathsport. Now Kaz must face his past and fight to save himself and his city from the war that Lord Zirpola is about to wage.