Personally I’m not doing any downhill riding with the motor in my backpack. Or really anything hard with sharp edges. I like having a working spine. Either it’

Personally I’m not doing any downhill riding with the motor in my backpack. Or really anything hard with sharp edges. I like having a working spine. Either it’s unsprung mass or a liability, and, well, actual e-bikes have converged on BB motors for a number of reasons.