All in the name of speed

Rollie Free, who on Sept 13th 1948 broke the 150 mph motorcycle speed record at the Bonneville Salt Flats on a modified Vincent Black Shadow. He stripped down to bathing trunks and lay flat on the bike to decrease wind resistance.

Via http://www.babysitterofthedamned.com/2005_05_01_babysitterofthedamned_archive.html