The center of rotation thing is true, but those aren’t very easy to ride either. They are heavy and sluggish (takes getting used to), and built for short people and not adjustable. For me to pedal one, my knee wants to hit my arm at the top of the pedal stroke.
Sheesh, some of you guys seem to think the Chinese army gets outfitted with these things! Get real. The ones they actually get issued are camouflage colors as well.
AFAIK military training is compulsory for all chinesse highschool and university students.AND china has a bad case of Oliypic fever & their school sports days tend to feature an opening ceromany along Olympic lines.
so… maybe it was along of lines of
We need some thing to look like olimpic rings that no one has done before… What were those things the students at the circus training school had in their sports day opening ceromany .
Big ring shaped things,we could paint 5 of them differnt colours. That should kep them quiet during thier millitary training this year.