Before radar became very commonly used, Bob Feller threw a pitch in a race against a motorcyle. Attached is the video. It calculates Feller's fastball to be 104 mph.
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I read with today's modern radar, Nolan Ryan's 100 mph pitches would have even higher.
Based on historical measurements and modern calculations, Nolan Ryan's fastball, which was recorded at 100.9 mph when measured 10 feet in front of home plate in 1974, would likely register between 108 and 110 mph if measured using today's standard radar technology, which captures velocity closer to the pitcher's release point. This adjustment accounts for the significant velocity loss a baseball experiences due to air resistance over the 60.6 feet to the plate, with a typical drop of about 9-10%. The calculation assumes the same rate of deceleration as other pitchers and uses the original measurement to project the speed at release. While the exact figure is an estimate based on physics and historical data, it suggests Ryan's fastball was among the fastest ever thrown, potentially exceeding the speeds of modern pitchers like Aroldis Chapman, whose record 105.1 mph pitch is measured at release.