It's less of an issue for this device. The reason is that the motor is further from the axle than a hub motor would be. Thus, there's less force on the frame for a given amount of torque.
It's less of an issue for this device. The reason is that the motor is further from the axle than a hub motor would be. Thus, there's less force on the frame for a given amount of torque.
A lot of extra force when slowing down from faster speeds though, no matter where the motor is added.
Not a lot of extra force.
About 5% more weight you need to slow down (80kg rider + 10kg bike + 4kg motor + battery)