I saw a person on one during my ride today and the person looked like she was really suffering but was going about 25 mph and not pedaling at all. No fenders, no bikerack, nothing. She blew past me, on a railtrail(took it to avoid the public school letting out.) Had to tt it to catch up so I could figure out how fast she was going, once figured out, I just slowed it down and continued on my planned route.