I explored options for lightweight mid-drive motors. The task is complicated by the fact that I will need to learn how to obtain power meter and cadence readings from the motor controller, and none of the models considered even hint at documentation for the communication protocols. The options include Bosch Performance Line SX, Bafang M820, and the increasingly popular DJI Avinox (although it is clearly overpowered and heavier than the other two options). The only one that can be purchased in a relatively normal way is the Bafang; the others are aimed at manufacturers and can only be bought second-hand. Nothing with unusual components is ever simple.