The Ampler Motor - specs & details

All Ampler bikes have a small geared hub drive with a brushless motor. Brushless motors mean that there are no brushes between the stator and the rotor. This makes the motor efficient and means that there are no wearing parts in need of replacement, making it essentially service-free. The motor was developed by Ampler.

  • The maximum torque is 45 Nm 
  • The motor has a nominal power output of 250 W
  • The peak power output of the motor is about 400 W
  • The motor complies with the European standard EN15194, which also means a maximum assist of 25 km/h

Due to its brushless design, no energy recuperation is possible, but this also means that no resistance is felt without motor assistance. A regular freewheel is installed inside the motor.

Interaction with the torque sensor

Thanks to the torque sensor, the bikes have a motor support that is tailored to you. The bike constantly measures how hard and at what frequency you pedal and regulates the torque based on this information. Together with the speed sensor in the motor, this results in a very natural riding feel.

The strength of the motor support can be regulated in two support modes, but is always based on your input on the pedals. Thus, there is no need to switch between those two support modes during your ride.

Operating the motor requires sophisticated electric systems. We’ve custom-developed a control board which ensures smooth and quiet operation even at high power levels. The hub motor includes double gear reduction to get a maximum torque of 50 Nm at a motor diameter of just 120 mm, allowing for a high power-to-weight ratio while keeping the looks inconspicuous.

the ampler rear motor

How does the motor perform uphill?

With a maximum torque of 45 Nm, we have a comparatively powerful rear hub motor. Our e-bikes support you with the help of the torque sensor in the bottom bracket, which selects the appropriate motor support from the pressure you apply to the pedals, the pedalling frequency and speed. 

Our e-bikes are designed for the city and can also cope with the odd climb – however, it may happen that you have to get out of the saddle and “help”, especially with the single-speed Curt model. 

ampler stout uphill

If you are wondering whether our bikes can make over the hill on your way to work or to the supermarket, ask the showroom or ambassador near you whether a longer test ride is possible. If not, you have the right to return the bike to us free of charge within 14 days if you buy through our website.

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