In December 2019, Germany's Dr. Dennis Freiburg, mechanical engineer, stamped his name into the Guinness Book of World Records with the world's lightest ebike: the 6.872-kg (15.15-lb) Freicycle. Now, ...

Rolling-ring drives are friction drives that convert the constant rotary motion of a plain shaft into a traversing action that moves an attached carriage. Used in positioning and reciprocating ...