Which Rolli fits the Handbike “Speedy DUO2” best -experiences? Is there someone who knows or knows someone who can make a statement about it? Only the company statements can and do not want to rely on me. Does anyone know the Rolli in the picture? Or in the video? www.youtube.com/watch?v=S9O8S7_JRDo&NR=1 Thank you in advance! Image => Source: www.speedy.de