I had never herd of a two wheeled setup for paraplegic riders before. I saw this guy on KillBoy.com, very cool.
http://2.bp.blogspot.com/_LxZ4Mi3rR3...h/img_9325.jpg
http://www.youtube.com/watch?v=8sVEI...eature=related
http://www.youtube.com/watch?v=PyK-9cD20YI&NR=1
http://www.youtube.com/watch?v=J7I16bPQM24&NR=1