From Bob Feller's Wikipedia page:
To publicize Feller's extraordinary pitching speed, the Office of the Commissioner of Baseball commissioned sports film analysis pioneer and former major leaguer Lew Fonseca to pit Feller's fastball against a motorcycle in a "100 mph" speed trial. The test was conducted in Chicago's Lincoln Park, with Feller in street shoes, suit pants, dress shirt, and tie, pitching without a mound on an asphalt roadway. He was required to hit a target 12 inches (300 mm) in diameter from 60 feet 6 inches (18.44 m) away, "as control is as important as speed".[29] The still accelerating Harley-Davidson passed Feller going 86 mph (138 km/h), yet even with a generous head start the ball beat the bike to the target by several feet. Feller's throw was calculated at the time to have reached 98.6 mph (158.7 km/h), later raised to 104 mph (167 km/h) using updated measuring methods.[3]: 27 [6][20]