a bike with square wheels

this is a bike with square wheels. i came by it one time in a youtube video. the square wheels ride along a track which makes it so the bike doesn't bump. 

this could be used as een practical example of some complex mathematics. 🧑🏫

i don't understand even a bit of the formula behind this🤓 (i just used a picture of the wikipedia page) it has something to do with catenaries (i think😬)

in the stepfile there is one parameter, the number of bumps. use this to make the track shorter or longer (i already included one with 7 or 5 bumps) 

there is also one wheel with a slot for a rubberband/Oring for grip. this slot is around the 120 mm long so the band should be a little shorter

if you have any feedback on my model or upload i would really appreciate it. 🙏