Triple chain wheel capable mid motor with integrated BB torque sensor for S class bikes.
http://www.flickr.com/photos/extraenergy_ev/sets/72157641530811414
For article see:
http://extraenergy.org/main.php?language=en&category=&subcateg=&id=47963
http://www.flickr.com/photos/extraenergy_ev/sets/72157641530811414
For article see:
http://extraenergy.org/main.php?language=en&category=&subcateg=&id=47963