Pedal assistance / PEDELEC

How does the "assistance" work?

Also called PEDELEC, the system provides assistance to your pedalling via the electric motor.

Simply push a simple on-off switch and start pedalling.  The motor will kick in and assist your pedalling.

The motor has sensors in it to detect how much power is being delivered to the wheel.  Depending on how hard you pedal, the motor will pump in more power to the wheel.  Krys bikes have from 3 to 6 levels of assistance, depending on how much work you want to put into the cycling.  Krys bikes don't have a maximum speed set as in Europe and USA but the motors naturally have a maximum speed through the gearing ratios of around 25 to 35km/h.  This maximum speed also depends on the gradient, head or tail winds and the rider fitness levels.

The sensors on various bikes work in different ways, some use a basic speed sensor and others use a torque sensor on the pedal crank.  The torque sensor provides more accurate power distribution between the rider and the motor, but the speed sensor allows you to use the bike's gears more effectively.  Krys uses both styles in its various vehicles.

Some vehicles also have a hand throttle - a simple twist increases or decreases the power from the motor.  This makes it much easier and more predictable to control the bike when maneuvring through obstacles and parking areas for example.   There is a chance in the future that throttle may be made illegal in Australia.  Krys bikes that have throttles also have a means of disabling the throttle, leaving only the pedal assistance mode active.  This way you get the best of both worlds while it is legal and protection of your investment in the future, should the laws eventually change.  The powers that be have been discussing this for several years now, so it is anyone's guess when this change may be made.

The more powerful bikes with higher voltages (eg 36V on electric bikes) provide a good level of torque and are very easy to pedal up even steep hills.  Note that a more powerful motor does not necessarily mean higher maximum speed on level ground but it does mean a proportionately faster speed uphill.