Originally Posted by
roadcrankr
Okay. Thanks. Does that sort of system work well?
I picture another mechanism in the bottom bracket to engage the crankset to spin without pedaling.
It works just fine. It is not 'another' mechanism in the bottom bracket. The mechanism in the bottom bracket is all the mechanism that is needed. No mechanism at all in the wheels means they can be removed and re-installed as easily as on a regular bike. It also keeps the weight of everything central and low down which is good for handling (feel).