Originally Posted by
Ironfish653
What CS did, and you can see it pretty clearly on their 2018 interbike demo, is replace all the 'teeth' on the shaft pinion 'gears' with individual bearings. It looks kinda like a flower, when viewed from the end. The teeth on the crank and cassette are shaped to drive and be driven by those circular bearing races.
One of Major Taylor's later track bikes was set up similar to this.
Bicycle Design by Tony Hadland:
