I bought a bike years ago and it had an Elliptical Front Sprocket, actually 3 of them... for 3 speeds.
Instead of the sprocket being round shape, it is shaped like an ellipse.
It was a no name Dirt Bike, made in China, and I purchased new from Costco in Reno, NV.
Long, long time ago... maybe 25 years..??
On the sprocket it says:
Computer design bio-pace.
Do they still make an Elliptical Sprocket?
If not, why not?
Seemed like a good idea to me... thats why I bought the bike.
Never have ever seen a bike like it, with the "ellipse".