 The bike was available in Europe in 250 and 350 versions as well as the 450.In 1971, Ducati released a variant for off-road use called the R/T and another street version, the Mark 3 Special, colloquially named the 'Silver Shotgun'.The motorcycling public seemed to feel that it should have been a “real” 500, and it did not sell well in the US, despite the fact that it outperformed many larger capacity motorcycles of its time.