Powerful motors help you alongPowerful motors help you alongKrys motors are brushless geared motors for great pulling power and long, low maintenance life.  There are no brushes to replace and the motors are low profile, quiet and efficient with the power drain from the battery.  The motors have a 'Hall sensor' so the battery management system knows how much power is going to the motor and how much power to put in to 'assist' your pedalling.