So how fast was Feller? The Meter to Record Feller's Speed article mentioned it was specifically going to examine his pitching speed. Satchel Paige, who could bring on the heat himself, believed Feller was the fastest and told teammates, "If anybody threw that ball any harder than Rapid Robert, then the human eye couldn't follow it." Feller once mentioned that he was clocked at 104 mph at Lincoln Park in Chicago. He also claimed he was clocked at 107.9 mph in a demonstration in 1946 at Griffith Stadium. At the Aberdeen Proving Grounds he was measured using the ever-popular speeding motorcycle test, once used in 1914 with Walter Johnson who reached 99.7 mph, and Feller reached 98.6 mph. The results of the test from the "new meter" were reported the day after the initial article