Leon Lauthier Stayer

  In bicycle racing, Staying is an event where a bicyclist pedals in the slipstream of a pacer- a motorcycle or car- in an attempt to obtain high speeds without the problem of wind resistance.

   In 1924, Belgian Leon Vanderstruyft broke the existing speed record at Monthléry with a speed of 115 kph, which was the impetus for Frenchman Leon Lauthier to try to return the record to France.

  He built this 2400cc V twin stayer with aerodynamic aluminum bodywork for the attempt. Professional cyclist Jean Brunier was hired to ride the bicycle and on November 1 1925 they raised the world record to 120 kph. 

  Leon Lauthier continued building stayers and according to this site, there were at least 25 made.