So how did we get to the point that the Suzuki GSX-R is the only frontline 750cc sportbike? It's a long story that started in 1976, when the AMA's Superbike class was established. Period rules specified one-liter engines (plus an allowable overbore that added up to 1025cc), and Reg Pridmore rode a highly modified BMW R90S twin to the inaugural title. From that point forward, however, the series belonged to the big fours from the Big Four (well, three of them anyway-Yamaha was preoccupied with two-stroke formula bikes). Racers such as Wes Cooley, Eddie Lawson and Freddie Spencer became legends riding these powerful, evil-handling Flexi-Flyers, which were scary to watch let alone ride. So in 1983, in the interest of safety, the AMA reduced the Superbike displacement limit to 750cc for fours and 1000cc for twins. Five years later the startup World Superbike series adopted the same formula.