WHY CRANK?
Crank or mid motor drive systems are able to deliver higher torque and smoother power delivery, giving you a more consistant and even riding expirience. These motors are used by all the highest manufacturers in the bike world including Bosch, Yamaha and Shimano and they have made the executive decition to only manufacturer this type of motor. These motors tend to have better aftercare and better lifecycle due to the level of manufacturers that support them.