5 ms·A lot of extra force when slowing down from faster speeds though, no matter where the motor is added.by mkl 2mo agoA lot of extra force when slowing down from faster speeds though, no matter where the motor is added.happosai 2mo agoNot a lot of extra force. About 5% more weight you need to slow down (80kg rider + 10kg bike + 4kg motor + battery)analog31 2mo agoBrakes handle this already. Rim brakes are attached to the frame above the wheel.