The R90S was a sport bike produced by BMW first introduced in 1973. The R90S is considered by many to be one of the first superbikes, and the first such machine from BMW.
The first U.S.A. AMA Superbike Championship was won in 1976 by Reg Pridmore riding a R90S. This type of engine is a 247 BMW and known as Airhead (motorcycle). It is especially well regarded amongst sportbikes from 1973-1976. Overall, it is the definitive ‘airhead’ BMW as regarded by owners and fans alike.