39. Harley-Davidson XR750
The XR-750 is a racing motorcycle made by Harley-Davidson since 1970. It was built primarily for dirt track racing but also for road racing in the XRTT variant. It has been associated with the careers of racers Mark Brelsford, Cal Rayborn, and Jay Springsteen, and was the favored motorcycle of stunt performer Evel Knievel. An XR-750 was also included in 1998 The Art of the Motorcycle exhibition, and one of Evel Knievel’s bikes are in the Smithsonian’s National Museum of American History America on the Move exhibit.