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The short history of bicycle drive trains

       

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  

 

DEAL DRIVE AUTOMATIC
circa 1982
DYKINS INDUSTRIES

BY USING AN EXPANDING & CONTRACTING CHAINRING MECHANISM BUILT
INTO THE CRANK SET, THE BICYCLE PROVIDES UP TO 16 GEAR RATIOS THAT RESPOND
AUTOMATICALLY TO THE PRESSURE EXERTED UPON THE PEDALS. IT IS THUS AN
AUTOMATIC DRIVE SYSTEM THAT DOES NOT REQUIRE ANY OF THE MECHANISMS
ASSOCIATED WITH GEARED BIKES.

                                                                Photos above taken at the Canada Science and Technology  
                                                                     

 

                                                                               

  Text above Mountain Bike Action April 1989

 

                                                                              

  Truvativ HammerSchmidt Planetary gear system

                                                                                                                          

 Shimano Airlines

 

 

 

 

 

 

 

 

                                                                 

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