Yamaha Power Assist Bicycles have our PW and PW-X center drive motors which operate with pedal assistance. By placing the motor low and in the center of the frame, the rider has greater control over the balance and maneuverability of the bicycle.
 
In addition, the integration of the motor as-one with the drive train increases the amount of torque. That power assistance, paired with the rider’s pedaling motion and quiet design elements, result in a natural assist which feels like an extension of themselves and not a mechanical influence on their bicycle.
 
So how does it work? Simply stated, these motors engage only when you are pedaling. The technology inside measures the rider’s pedaling force, the bicycle’s rolling speed and the RPMs of the pedals, then adds the right amount of power into the drivetrain. The level of power assist that the motor puts out is up to the rider and can be adjusted on-the-fly.