So kann man sein altes Velo auch elektrisch antreiben lassen:

http://www.designboom.com/technology/geoorbital-reinvents-wheel-any-bike-electric-30-09-2016/

geoorbital-wheel-designboom-600 header screen-shot-2016-09-27-at-1-40-57-pm screen-shot-2016-09-30-at-11-07-40-am screen-shot-2016-09-30-at-11-09-06-am