Hi,
ISMB: it's a (big) business.
Another ball bearing vs. roller bearing aspect:
roller bearing: higher friction; higher inner temperature
That is why you won't find roller bearings for high rev applications.
Forces: shure there are all kinds of forces, because the IMS also transmits forces from one side to the other and it's not a static system because you accelerate and decelerate.:
Regards, Markus