Monday 13th September 1948
Rollie Free broke the US national motorcycle speed record at Bonneville Salt Flats in Utah riding the first Vincent Black Lightning. During test runs Free reached average speeds of 148.6 mph (239.1 km/h). To reduce drag, Free stripped to his swimming shorts for the final run, which he made lying flat with his legs stretched out and his head low, guiding the Vincent by following a black stripe painted on the salt bed. The stunt worked as Free covered the mile in 23.9 seconds, passing the 150 mph (240 km/h) barrier and on the return run he reached a record average speed of 150.313 mph (241.905 km/h). This led to one of the most famous photographs in motorcycle history, known as the “bathing suit bike”. The American Motorcyclist Association certified Free’s record. Innovative features of the bike included the first-ever Vincent rear shock absorber, the first Mk II racing cams and horizontally mounted racing carburettors. In 1950, Rollie Free returned to the Bonneville Salt Flats and broke his own record, averaging speeds of 156.58 mph (251.99 km/h) on the Vincent despite a high-speed crash during those speed trials.