I’ve read about (but have no experience with) larger diameter rollers being easier to turn (less pedaling force) than smaller diameter rollers. IOW harder workouts on smaller diameter rollers. So maybe Crown’s idea used that for self centering, encouraging rider to stay centered as it’s easier. THAT seems counter-intuitive. Something that’s supposed to train the rider for excellent bike handling skills takes away the need to have excellent bike handling skills.

And those roller experts in the film take their product to a trade show for people to see and try out but they have no mounting blocks nor anything to hold onto while getting on their product. Interviewer must hold on to the flimsy low curtain wall between booths. Huh? I’d walk right on by.

I’ll stick with my vintage 4” Kreitler rollers. Killer certified.