Alfred Letourneur’s claim to fame was that he set a record for the motor-paced measured mile of 108.9 m.p.h. in 1941. He was riding a Schwinn with 252 inch gear.

• Publisher: US Patent and Trademark Office
• Inventor: Alfred Letourneur
• Country: USA
• Date: application filed June 1944
• Derailleur brands: unknown
• Derailleurs: no known commercial product