I'm not sure what to make of them, yet.Superbike: 900cc-1000cc four-stroke, any number of cylinders.
Supersport: 600cc four-stroke, twin and four cylinders.
Formula Xtreme: 600cc four-stroke, four cylinders; 750cc four-stroke, twin cylinders;
250cc-330cc two-stroke. All highly modified.
Superstock: 750cc-1000cc four-stroke, four cylinders; up to 1350cc air-cooled twin cylinders