A deep resonant rumbling rises suddenly to banshee screams. A pair of cycles, blurring with speed, flash past on the left. They are followed by three, then a pack numbering as many as eight, all moving at speed. The riders appear like go-gangers, brilliant reflective helmets, gleaming wet-look jackets and boots, vambraces and gauntlets, some perhaps studded and spiked. The cycles have the mercurial streamlined forms of Rapiers, Auroras, and Scorpions, all of them high-powered street machines.