[chadr03]

I would suspect people are worried about radial loading on the motor. It is more of a question is the motor designed for a radial load or not. Many motors are only designed to transmit torque and the motor's internal bearings are not sized sufficiently to account for radial loads such as gears or belts. While I do not know the if there are any radial loading specs on the CIMs they usually have a shaft mounted pinion with a cantilevered setup. This will produce a pretty significant radial loading so I would suspect that you would not have any issues directly driving something that produced a moderate radial load.